CN117766983A - Antenna assembly and electronic equipment - Google Patents

Abstract

The embodiment of the application provides an antenna assembly, which comprises a radiation branch, a feed source, a first parasitic branch and a second parasitic branch. The radiation branch comprises a feed point; the feed source is connected with the feed point and is used for exciting the radiation branches to work in a preset frequency band. The first parasitic branch is coupled with the radiation branch and is magnetic field coupling, so that a first high-frequency radiation zero point is formed at a first high-frequency, wherein the first high-frequency is higher than the highest frequency of the preset frequency band and the frequency interval between the first high-frequency and the highest frequency of the preset frequency band is smaller than or equal to the preset frequency interval. The second parasitic branch is coupled with the radiation branch and is electric field coupling, so that a first low-frequency radiation zero point is formed at a first low-frequency, wherein the first low-frequency is lower than the lowest frequency of the preset frequency band and the frequency interval between the first low-frequency and the lowest frequency of the preset frequency band is smaller than or equal to the preset frequency interval. The application also provides electronic equipment. The method and the device can effectively ensure the radiation performance of the preset frequency band.

Description

Antenna assembly and electronic equipment

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to an antenna assembly and an electronic device having the antenna assembly.

Background

At present, with the popularization of 5G communication technology, the communication experience of people is better, the antennas are more and more, and the antenna frequency bands required to be supported are more and more. In some cases, in order to ensure interference between antennas, a filter is often required to be added to perform filtering processing to suppress nearby frequency bands outside the supported frequency band, so as to ensure radiation performance of the antennas operating in the preset frequency band. However, in the prior art, a special filter is required to be additionally added, resulting in an increase in size and cost.

Disclosure of Invention

The application provides an antenna assembly and electronic equipment, so as to solve the problem.

In a first aspect, an antenna assembly is provided that includes a radiating branch, a feed, a first parasitic branch, and a second parasitic branch. The radiation branch comprises a feed point; the feed source is connected with the feed point and is used for exciting the radiation branch to work in a preset frequency band. The first parasitic branch is coupled with the radiation branch and is magnetic field coupling, so that a first high-frequency radiation zero point is formed at a first high-frequency, wherein the first high-frequency is higher than the highest frequency of the preset frequency band, and the frequency interval between the first high-frequency and the highest frequency of the preset frequency band is smaller than or equal to the preset frequency interval. The second parasitic branch is coupled with the radiation branch and is electric field coupling, so as to form a first low-frequency radiation zero point at a first low-frequency, wherein the first low-frequency is lower than the lowest frequency of the preset frequency band, and the frequency interval between the first low-frequency and the lowest frequency of the preset frequency band is smaller than or equal to the preset frequency interval.

In a second aspect, there is also provided an electronic device comprising an antenna assembly. The antenna assembly includes a radiating branch, a feed, a first parasitic branch, and a second parasitic branch. The radiation branch comprises a feed point; the feed source is connected with the feed point and is used for exciting the radiation branch to work in a preset frequency band. The first parasitic branch is coupled with the radiation branch and is magnetic field coupling, so that a first high-frequency radiation zero point is formed at a first high-frequency, wherein the first high-frequency is higher than the highest frequency of the preset frequency band, and the frequency interval between the first high-frequency and the highest frequency of the preset frequency band is smaller than or equal to the preset frequency interval. The second parasitic branch is coupled with the radiation branch and is electric field coupling, so as to form a first low-frequency radiation zero point at a first low-frequency, wherein the first low-frequency is lower than the lowest frequency of the preset frequency band, and the frequency interval between the first low-frequency and the lowest frequency of the preset frequency band is smaller than or equal to the preset frequency interval.

According to the electronic equipment and the antenna assembly, the first parasitic branch is coupled with the radiation branch and is in magnetic field coupling, so that a first high-frequency radiation zero point is formed at a first high-frequency position, and the second parasitic branch is coupled with the radiation branch and is in electric field coupling, so that a first low-frequency radiation zero point is formed at a first low-frequency position, therefore, the first high-frequency radiation zero point and the first low-frequency radiation zero point can be formed at two sides of a preset frequency band respectively through the first parasitic branch and the second parasitic branch, the frequency interval between the frequency corresponding to the first high-frequency radiation zero point and the highest frequency of the preset frequency band and the frequency interval between the frequency corresponding to the first low-frequency radiation zero point and the lowest frequency of the preset frequency band are smaller than or equal to the preset frequency interval, radiation efficiency of a nearby frequency band of the preset frequency band can be lowered, the nearby frequency band of the preset frequency band can be effectively realized, the radiation zero point and the radiation performance of the nearby frequency band of the preset frequency band can be ensured, and the additional space is saved due to the fact that the radiation performance of the preset frequency band is increased independently is not needed.

Drawings

In order to more clearly describe the technical solutions in the embodiments or the background of the present application, the following description will describe the drawings that are required to be used in the embodiments or the background of the present application.

Fig. 1 is a schematic diagram of a simple structure of an antenna assembly according to an embodiment of the present application.

Fig. 2 is a schematic diagram of magnetic field coupling between a radiating branch and the first parasitic branch of an antenna assembly to create a phase difference at a first high frequency in some embodiments of the present application.

Fig. 3 is a schematic diagram of magnetic field coupling between a radiating branch and the second parasitic branch of an antenna assembly to create a phase difference at a first low frequency in some embodiments of the present application.

Fig. 4 is another simplified structural schematic diagram of an antenna assembly in some embodiments of the present application.

Fig. 5 is a schematic diagram of yet another simple structure of an antenna assembly in some embodiments of the present application.

Fig. 6 is a further schematic structural diagram of an antenna assembly in some embodiments of the present application.

Fig. 7 is a schematic plan view of a more specific structure of an antenna assembly in some embodiments of the present application.

Fig. 8 is a schematic perspective view of a more specific structure of an antenna assembly in some embodiments of the present application.

Fig. 9 is a schematic diagram of return loss curves of an antenna assembly in some embodiments of the present application.

Fig. 10 is a schematic diagram illustrating radiation efficiency curves of an antenna assembly according to some embodiments of the present application.

Fig. 11 is a normalized radiation pattern of an antenna assembly in some embodiments of the present application.

Fig. 12 is another normalized radiation pattern of an antenna assembly in some embodiments of the present application.

Fig. 13 is a block diagram of an electronic device in some embodiments of the present application.

Fig. 14 is a schematic view showing a part of the internal structure of the electronic apparatus.

Fig. 15 is a schematic plan view of an electronic device in some embodiments of the present application.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.

In the description of the embodiments of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "thickness", "width", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not imply or indicate that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. The term "coupled" as used herein includes direct coupling, indirect coupling, and electrical coupling. In the description of the embodiments of the present invention, the terms "first", "second", and the like are not particularly limited, but rather, in order to distinguish between the same-named objects, the terms "first", "second", and the like refer to the same-named objects in the case of the description. Herein, "a" and/or "B" in the present application include "a" or "B", and "a" and "B", etc.

Referring to fig. 1, a simplified structure of an antenna assembly 1 according to an embodiment of the present application is shown. As shown in fig. 1, the antenna assembly 1 comprises a radiating branch 11, a feed 12, a first parasitic branch 13 and a second parasitic branch 14. The radiation branch 11 comprises a feed point F1, and the feed source 12 is connected with the feed point F1 and is used for exciting the radiation branch 11 to work in a preset frequency band. The first parasitic branch 13 is coupled to the radiation branch 11 and is magnetic field coupled to form a first high frequency radiation zero at a first high frequency, wherein the first high frequency is higher than a highest frequency of the preset frequency band and a frequency interval between the first high frequency and the highest frequency of the preset frequency band is smaller than or equal to a preset frequency interval. The second parasitic branch 14 is coupled to the radiation branch 11 and is an electric field coupling, so as to form a first low-frequency radiation zero at a first low-frequency, where the first low-frequency is lower than a lowest frequency of the preset frequency band and a frequency interval between the first low-frequency and the lowest frequency of the preset frequency band is smaller than or equal to a preset frequency interval.

Therefore, in the present application, the first parasitic branch 13 is coupled with the radiation branch 11 and is a magnetic field coupling, so that a first high-frequency radiation zero is formed at a first high-frequency, and the second parasitic branch 14 is coupled with the radiation branch 11 and is an electric field coupling, so that a first low-frequency radiation zero is formed at a first low-frequency, so that, through the first parasitic branch 13 and the second parasitic branch 14, a first high-frequency radiation zero and a first low-frequency radiation zero can be formed at two sides of the preset frequency band respectively, and a frequency interval between a frequency corresponding to the first high-frequency radiation zero and a highest frequency of the preset frequency band and a frequency interval between a frequency corresponding to the first low-frequency radiation zero and a lowest frequency of the preset frequency band are smaller than or equal to the preset frequency interval, so that radiation efficiency of a nearby frequency band of the preset frequency band can be lowered, inhibition of the nearby frequency band of the preset frequency band can be effectively realized, and the radiation performance of the preset frequency band can be ensured to be increased.

The first high-frequency and the first low-frequency in the present application refer to the high-frequency and the low-frequency relative to the preset frequency band, and not refer to frequencies in a frequency band such as a high-frequency band or a low-frequency band in a 4G or 5G communication network. That is, as described above, the first high frequency is a frequency higher than the highest frequency of the preset frequency band and having a frequency interval with the highest frequency of the preset frequency band less than or equal to a preset frequency interval, and the first low frequency is a frequency lower than the lowest frequency of the preset frequency band and having a frequency interval with the lowest frequency of the preset frequency band less than or equal to a preset frequency interval.

The formation of the radiation zero at a certain frequency means that the radiation efficiency at the certain frequency is very low and is similar to zero radiation efficiency, wherein the radiation zero is also a trough point of the radiation efficiency, and when the radiation zero is at a certain frequency, the radiation efficiency in a certain surrounding frequency range is pulled down to a lower value, so that the radiation efficiency in a certain surrounding frequency range is a frequency band which cannot be supported by the antenna assembly 1 due to the low radiation efficiency. Therefore, when the frequency interval between the frequency corresponding to the first high-frequency radiation zero point and the highest frequency of the preset frequency band and the frequency interval between the frequency corresponding to the first low-frequency radiation zero point and the lowest frequency of the preset frequency band are smaller than or equal to the preset frequency interval, the frequency band in a certain frequency range around the first high-frequency radiation zero point is close to the highest frequency of the preset frequency band and forms a stop band at the high frequency of the preset frequency band, and the frequency band in a certain frequency range around the first low-frequency radiation zero point is close to the lowest frequency of the preset frequency band and forms a stop band at the low frequency of the preset frequency band. Therefore, the radiation efficiency of the frequency bands at both sides of the preset frequency band is suppressed, and since the antenna assembly 1 supports the preset frequency band and the electromagnetic wave signals of the frequency bands at both sides of the preset frequency band are interference signals, the radiation efficiency of the frequency bands at both sides of the preset frequency band is suppressed, so that the interference signals are actually filtered, and only the frequency band is selected to work in the preset frequency band, so that the radiation performance of the preset frequency band can be ensured or improved.

In some embodiments, as shown in fig. 1, the radiating branch 11 further includes a first ground terminal G1 and a first open end O1, and the feeding point F1 is located between the first ground terminal G1 and the first open end O1. Thus, the radiating stub 11 generally forms an inverted-F antenna (IFA, inverted F antenna). Due to the smaller size requirements of the inverted-F antenna, it is advantageous to reduce the overall size of the antenna assembly 1.

In some embodiments, the radiating stub 11 has an equivalent electrical length λ ₁ 4, wherein the lambda ₁ And the wavelength corresponding to the preset frequency band is obtained. Thus, the radiation branch 11 mayAnd the transmission and reception of electromagnetic wave signals in the preset frequency band are supported under the excitation of the feed source 12. The wavelength corresponding to the preset frequency band may specifically be a wavelength corresponding to a center frequency or a resonant frequency of the preset frequency band.

In some embodiments, as shown in fig. 1, the first parasitic branch 13 includes a second ground terminal G2 and a second open terminal O2, the second parasitic branch 14 includes a third ground terminal G3 and a third open terminal O3, the second ground terminal G2 and the third ground terminal G3 are grounded, wherein the second ground terminal G2 of the first parasitic branch 13 is closer to the feed point F1 of the radiating branch 11 than the third ground terminal G3 of the second parasitic branch 14, and the third open terminal O3 of the second parasitic branch 14 is adjacent to the first open terminal O1 of the radiating branch 11.

Wherein, when the radiating branch 11 resonates, the electric field is mainly concentrated at the open end of the radiating branch 11, that is, the first end 11a, and the magnetic field is concentrated at the feeding position of the radiating branch 11, that is, near the feeding point F1, so when the second ground end G2 of the first parasitic branch 13 is adjacent to the feeding point F1 of the radiating branch 11 and is closer to the feeding point F1 of the radiating branch 11 than the second ground end G2, the first parasitic branch 13 will be magnetically coupled with the radiating branch 11, and when the third open end O3 of the second parasitic branch 14 is adjacent to the first open end O1 of the radiating branch 11, the second parasitic branch 14 will be electrically coupled with the radiating branch 11.

Wherein the proximity of the third open end O3 of the second parasitic branch 14 to the first open end O1 of the radiating branch 11 may mean that a distance between the third open end O3 of the second parasitic branch 14 and the first open end O1 of the radiating branch 11 is less than a preset distance, for example less than 1 cm.

The ground terminal in the present application refers to a grounded terminal, and the open terminal refers to a terminal that is in a suspended state and is not connected to ground or other elements.

In some embodiments, the equivalent electrical length of the radiating branch 11 meets the resonance requirement of a preset frequency band, the resonance frequency corresponding to the equivalent electrical length of the first parasitic branch 13 is located between the preset frequency band and the first high-frequency band, and the resonance frequency corresponding to the equivalent electrical length of the second parasitic branch 14 is located between the preset frequency band and the first low-frequency band.

Wherein, the fact that the equivalent electrical length of the radiation branch 11 meets the resonance requirement of the preset frequency band may mean that the equivalent electrical length of the radiation branch 11 is λ ₁ 4, wherein the lambda ₁ And the wavelength corresponding to the preset frequency band is obtained. The resonant frequency corresponding to the equivalent electrical length of the first parasitic branch 13 refers to 1/4 of the wavelength corresponding to the resonant frequency of the equivalent electrical length of the first parasitic branch 13, and the resonant frequency corresponding to the equivalent electrical length of the second parasitic branch 14 refers to 1/4 of the wavelength corresponding to the resonant frequency of the equivalent electrical length of the second parasitic branch 14.

The resonant frequency corresponding to the equivalent electrical length of the first parasitic branch 13 is located between the preset frequency band and the second high-frequency, specifically, the resonant frequency corresponding to the equivalent electrical length of the first parasitic branch 13 is located between the highest frequency of the preset frequency band and the first high-frequency, the resonant frequency corresponding to the equivalent electrical length of the second parasitic branch 14 is located between the preset frequency band and the first low-frequency, and specifically, the resonant frequency corresponding to the equivalent electrical length of the second parasitic branch 14 is located between the lowest frequency of the preset frequency band and the first low-frequency.

In some embodiments, the first parasitic branch 13 has an equivalent electrical length λ ₂ 4, wherein the lambda ₂ For the wavelength corresponding to the frequency between the preset frequency band and the first high-frequency, the equivalent electrical length of the second parasitic branch 14 is lambda ₃ 4, wherein the lambda ₃ And the wavelength is the wavelength corresponding to the frequency between the preset frequency band and the first low-frequency.

The equivalent electrical length of the radiating branch 11 meets the resonance requirement of a preset frequency band, the resonance frequency corresponding to the equivalent electrical length of the first parasitic branch 13 is located between the preset frequency band and the first high-frequency, the resonance frequency corresponding to the equivalent electrical length of the second parasitic branch 14 is located between the preset frequency band and the first low-frequency, and when the first parasitic branch 13 and the radiating branch 11 are magnetically coupled, currents at the first high-frequency in the radiating branch 11 and the first parasitic branch 13 are reversed, so that a first high-frequency radiation zero is formed; when the second parasitic branch 14 is coupled to the radiation branch 11 by an electric field, the currents at the first low frequency in the radiation branch 11 and the second parasitic branch 14 are inverted to form a first low frequency radiation zero.

In some embodiments, the resonant frequency corresponding to the equivalent electrical length of the first parasitic branch 13 is located between the preset frequency band and the first high-frequency, and the first parasitic branch 13 may be designed in advance according to the frequency at which the first high-frequency radiation zero point is expected to occur, that is, the first high-frequency, so that the equivalent electrical length of the first parasitic branch 13 is 1/4 of the wavelength corresponding to a certain frequency located between the highest frequency of the preset frequency band and the first high-frequency. Likewise, the resonant frequency corresponding to the equivalent electrical length of the second parasitic branch 14 is located between the preset frequency band and the first low-frequency, or the second parasitic branch 14 may be designed in advance according to the frequency at which the first low-frequency radiation zero point is expected to occur, that is, the first low-frequency, so that the equivalent electrical length of the second parasitic branch 14 is 1/4 of the wavelength corresponding to a certain frequency located between the lowest frequency of the preset frequency band and the first low-frequency.

In some embodiments, the radiating branch 11 is parallel to the first parasitic branch 13 and the second parasitic branch 14.

Further, since the first parasitic branch 13 is magnetically coupled with the radiating branch 11, and the equivalent electrical length of the radiating branch 11 meets the resonance requirement of the preset frequency band, the resonance frequency corresponding to the equivalent electrical length of the first parasitic branch 13 is located between the preset frequency band and the first high frequency, so that the current at the first high frequency in the radiating branch 11 and the first parasitic branch 13 will be inverted, and since the radiating branch 11 is parallel to the first parasitic branch 13, the directions of the currents at the first high frequency in the radiating branch 11 and the first parasitic branch 13 are opposite, so that the electromagnetic wave signals of the first high frequency generated by the radiating branch 11 and the first parasitic branch 13 cancel each other, which is equivalent to that the antenna assembly 1 has no signal at the first high frequency, and the radiation efficiency is almost zero, so as to form a first high-frequency radiation zero point. In addition, since the second parasitic branch 14 is electrically coupled to the radiating branch 11, and since the resonant frequency corresponding to the equivalent electrical length of the second parasitic branch 14 is located between the preset frequency band and the first low frequency band, the currents of the radiating branch 11 and the second parasitic branch 14 at the first low frequency band will be inverted, and since the radiating branch 11 is substantially parallel to the second parasitic branch 14, the directions of the currents of the radiating branch 11 and the second parasitic branch 14 at the first low frequency band are opposite, and the generated electromagnetic wave signals cancel each other, which is equivalent to that the antenna assembly 1 is entirely free of electromagnetic wave signals at the first low frequency band, and the radiation efficiency is almost zero, thereby forming a first low frequency radiation zero.

Wherein the radiation branch 11 is parallel to the first parasitic branch 13 and the second parasitic branch 14, only for better implementation of the radiation zero. In some embodiments, the radiating branch 11 may not be parallel to the first parasitic branch 13 and the second parasitic branch 14, and only the current at the first high-frequency in the radiating branch 11 and the first parasitic branch 13 needs to be inverted, so that the phase of the electromagnetic wave signal radiated to the first high-frequency in the free space through the radiating branch 11 and the first parasitic branch 13 may be inverted, so that the first high-frequency radiation zero point can be basically realized. Likewise, the first low frequency radiation zero point can be basically realized only by inverting the phases of the electromagnetic wave signals of the first low frequency radiated into the free space through the radiation branch 11 and the second parasitic branch 14, respectively, by inverting the currents of the radiation branch 11 and the second parasitic branch 14 at the first low frequency.

The radiation branches 11, the first parasitic branches 13, and the second parasitic branches 14 are stripe shapes, and the radiation branches 11 are substantially parallel to the first parasitic branches 13 and the second parasitic branches 14, which may mean that the extension directions of the radiation branches 11, the first parasitic branches 13, and the second parasitic branches 14 are substantially parallel. The extending directions of the radiating branch 11, the first parasitic branch 13, and the second parasitic branch 14 may be the extending directions of the longest sides of the radiating branch 11, the first parasitic branch 13, and the second parasitic branch 14.

In some embodiments, the radiating branch 11, the first parasitic branch 13, and the second parasitic branch 14 may be straight or bent bars. When the radiation branch 11, the first parasitic branch 13, and the second parasitic branch 14 are straight, the longest sides of the radiation branch 11, the first parasitic branch 13, and the second parasitic branch 14 may be the longest straight sides of the radiation branch 11, the first parasitic branch 13, and the second parasitic branch 14. When the radiation branch 11, the first parasitic branch 13, and the second parasitic branch 14 are bent bars, the longest sides of the radiation branch 11, the first parasitic branch 13, and the second parasitic branch 14 may be the longest bent line sides of the radiation branch 11, the first parasitic branch 13, and the second parasitic branch 14 extending in the bending direction.

In this application, the radiation branch 11 is parallel to the first parasitic branch 13 and the second parasitic branch 14, which means that the radiation branch 11 is substantially parallel, but not strictly parallel, for example, an angle between the radiation branch 11 and the extending directions of the first parasitic branch 13 and the second parasitic branch 14 is within a certain angle range, for example, 30 °, and may be regarded as being substantially parallel.

Referring to fig. 2, a schematic diagram of a magnetic field coupling between the radiating branch 11 and the first parasitic branch 13 of the antenna assembly 1 to generate a phase difference at a first high frequency is shown in some embodiments of the present application.

When magnetic field coupling occurs between two branches, the two branches are equivalent to series connection of an inductor. As shown in fig. 2, the radiation branch 11 and the first parasitic branch 13 are coupled by a magnetic field, which is equivalent to connecting an inductor L0 in series, and the inductor generates a phase difference of-90 °.

The feed source 12 specifically generates a feed signal to the feed point F1, excites the radiation branch 11 to operate in a preset frequency band, and excites the first parasitic branch 13 and the second parasitic branch 14 through coupling of the radiation branch 11, that is, can be regarded as coupling the feed signal to be transmitted from the radiation branch 11 to the first parasitic branch 13 and the second parasitic branch 14 through coupling, where the feed signal can be an ac signal with a corresponding frequency, and after the radiation branch 11 and the first parasitic branch 13 and the second parasitic branch 14 are fed, the currents in the radiation branch 11 and the first parasitic branch 13 and the second parasitic branch 14 are described above.

In fig. 2 is schematically shown a first path P1, through which the feed signal generated by the feed 12 is conducted through the radiating branch 11, and a second path P2, through the radiating branch 11 and the first parasitic branch 13. Wherein the first path P1 is illustrated with solid arrows and the second path P2 is illustrated with dashed arrows. Wherein the frequency of the feed signal may be a first high frequency when the antenna assembly 1 is operating at the first high frequency.

When the equivalent electric length of a certain branch is higher than the frequency of the conducted feed signal, the equivalent electric length of the branch is smaller than 1/4 of the wavelength corresponding to the feed signal, and when the feed signal is conducted through the branch, the phase is advanced by 90 degrees, and a phase difference of +90 degrees is generated. Correspondingly, when the resonance frequency corresponding to the equivalent electrical length of a certain branch is lower than the frequency of the conducted feed signal, the equivalent electrical length of the branch is larger than 1/4 of the wavelength corresponding to the feed signal, and when the feed signal is conducted through the branch, the phase is delayed by 90 degrees, so that a phase difference of-90 degrees is generated. When the resonance frequency corresponding to the equivalent electrical length of a certain branch is equal to the frequency of the conducted feed signal, namely, the branch resonates at the moment, and no phase difference is generated when the feed signal is conducted through the branch.

When the initial phase of the feed signal output by the feed source 12 is set to be 0 ° and the frequency is the first high frequency, the equivalent electrical length of the radiating branch 11 meets the resonance requirement of a preset frequency band, and the equivalent electrical length of the radiating branch 11 is greater than 1/4 of the wavelength corresponding to the first high frequency because the preset frequency band is lower than the first high frequency, so that the phase of the radiating branch 11 lags by 90 ° when the feed signal is conducted, that is, a phase of-90 ° is generated, and therefore, the phase of the feed signal after passing through the first path P1 is finally-90 °. And because the radiation branch 11 and the first parasitic branch 13 are coupled by a magnetic field, which is equivalent to connecting an inductance L0 in series, the inductance generates a phase difference of-90 degrees, and thus, when the feed signal is coupled and conducted to the first parasitic branch 13, a phase difference of-90 degrees is generated. And since the resonance frequency corresponding to the equivalent electrical length of the first parasitic branch 13 is located between the preset frequency band and the first high frequency and is also lower than the first high frequency, a phase difference of-90 ° is also generated, and thus, the phase of the feeding signal passing through the second path P2 is finally-90 ° + -90 ° + -90 ° = -270 °.

Thus, the phases of the electromagnetic wave signals emitted into free space through the first path P1 and said second path P2 will be-90 ° and-270 °, respectively, exhibiting a phase difference of 180 °, i.e. an inversion.

It can be seen that, when the equivalent electrical length of the radiating branch 11 meets the resonance requirement of the preset frequency band and the resonance frequency corresponding to the equivalent electrical length of the first parasitic branch 13 is located between the preset frequency band and the first high-frequency, the first parasitic branch 13 and the radiating branch 11 are magnetically coupled, so that currents at the first high-frequency frequencies in the radiating branch 11 and the first parasitic branch 13 are inverted.

Referring to fig. 3, a schematic diagram of a magnetic field coupling between the radiating branch 11 and the second parasitic branch 14 of the antenna assembly 1 to generate a phase difference at a first low frequency is shown in some embodiments of the present application.

When electric field coupling occurs between two branches, the two branches are equivalent to a capacitor connected in series. As shown in fig. 6, the radiation branch 11 and the second parasitic branch 14 are coupled by an electric field, which is equivalent to a capacitor C0 connected in series, and the capacitor generates a phase difference of +90°.

In fig. 3 a first path P1 of the feed signal generated by the feed 12 conducted through the radiating branch 11 and a third path P3 conducted through the radiating branch 11 and the second parasitic branch 14 are schematically shown. Wherein the first path P1 is illustrated with solid arrows and the third path P3 is illustrated with dashed arrows. Wherein, when the antenna assembly 1 is operated at a first low frequency, the frequency of the feed signal may be the first low frequency.

When the initial phase of the feed signal output by the feed source 12 is set to be 0 ° and the frequency is the first low frequency, the equivalent electrical length of the radiation branch 11 meets the resonance requirement of the preset frequency band, and the equivalent electrical length of the radiation branch 11 is smaller than 1/4 of the wavelength corresponding to the first low frequency because the preset frequency band is higher than the first low frequency, so that the phase of the radiation branch 11 is advanced by 90 ° when the feed signal is conducted, that is, the phase of the feed signal is generated by +90°, and therefore, the phase of the feed signal after passing through the first path P1 is finally +90 °. Because the electric field coupling is between the radiation branch 11 and the second parasitic branch 14, which is equivalent to connecting a capacitor C0 in series, as described above, the capacitor may generate a phase difference of +90°, and thus, when the feed signal coupling is conducted to the second parasitic branch 14, a phase difference of +90° is generated. Since the resonant frequency corresponding to the equivalent electrical length of the second parasitic branch 14 is located between the preset frequency band and the first low frequency band and is also higher than the first low frequency band, a +90° phase difference is also generated, and thus, the phase of the feeding signal passing through the third path P3 is finally 90 ° +90 ° +90= +270 °.

Thus, the phases of the current/feed signals conducted through the first path P1 and the third path P3 are +90° and +270° respectively, exhibiting a phase difference of 180 °, i.e., an inversion phase.

It can be seen that, when the equivalent electrical length of the radiating branch 11 meets the resonance requirement of the preset frequency band and the resonance frequency corresponding to the equivalent electrical length of the second parasitic branch 14 is located between the preset frequency band and the first low-frequency, when the second parasitic branch 14 is electrically coupled with the radiating branch 11, the currents at the first low-frequency frequencies in the radiating branch 11 and the first parasitic branch 13 will be inverted.

Wherein, in some embodiments, the preset frequency interval is 350MHz.

That is, in some embodiments, the first parasitic branch 13 is coupled to the radiating branch 11 and is magnetic field coupled for forming a first high frequency radiation zero at a first high frequency that is higher than and spaced from a highest frequency of the preset frequency band by less than or equal to 350MHz. The second parasitic branch 14 is coupled to the radiation branch 11 and is an electric field coupling, so as to form a first low-frequency radiation zero at a first low-frequency, and the first low-frequency is lower than the lowest frequency of the preset frequency band and the frequency interval between the first low-frequency and the lowest frequency of the preset frequency band is less than or equal to 350MHz.

When a certain frequency is the radiation zero point, the radiation efficiency in a certain surrounding frequency range is reduced to a lower value, for example, lower than a preset radiation efficiency value, so that the certain surrounding frequency range is a frequency band which cannot be supported by the antenna component 1 due to low radiation efficiency, therefore, when a first high frequency corresponding to the first high frequency radiation zero point is higher than the highest frequency of the preset frequency band and the frequency interval between the first high frequency zero point and the highest frequency of the preset frequency band is smaller than or equal to 350MHz, the radiation efficiency in the certain surrounding frequency range of the first high frequency is reduced to be lower than the preset radiation efficiency value, and the certain surrounding frequency range which takes the first high frequency as the center frequency is reduced to be lower than the preset radiation efficiency value, for example, 200MHz, 400MHz and the like, therefore, when the frequency interval between the lowest frequency of the certain surrounding frequency range of the first high frequency and the highest frequency band is higher than the highest frequency of the preset frequency band, the radiation efficiency in the vicinity of the preset frequency band can not be restrained, and the radiation efficiency can not be effectively restrained at the highest frequency of the left or right of the frequency band, and the adjacent frequency ranges can not be restrained at the highest frequency of the preset frequency band, and the highest frequency can be restrained at the highest frequency of the left frequency.

Similarly, when the first low-frequency radiation zero point corresponds to a first low-frequency higher than the lowest frequency of the preset frequency band and the frequency interval between the first low-frequency radiation zero point and the lowest frequency of the preset frequency band is smaller than or equal to 350MHz, the radiation efficiency in a certain frequency range around the first low-frequency is lowered to a lower value, for example, the radiation efficiency value is also lower than the preset radiation efficiency value, and the certain frequency range around the first low-frequency radiation zero point which is lowered to the lower value generally has hundreds of MHz, for example, 400MHz, etc., so that the interval between the highest frequency of the certain frequency range around the first low-frequency radiation zero point and the lowest frequency of the preset frequency band is only about 100MHz, and therefore, a frequency band which is lower in radiation efficiency and cannot work starts to appear at a frequency about 100MHz lower than the lowest frequency of the preset frequency band, and therefore, adjacent frequency bands around the lowest frequency of the preset frequency band can be effectively restrained. Therefore, adjacent frequency bands on the high side and the low side of the preset frequency band can be effectively restrained, and radiation performance in the preset frequency band is ensured or improved.

The preset radiation efficiency value can be a critical value for representing whether the radiation efficiency meets the electromagnetic wave receiving and transmitting condition, and when the radiation efficiency of a certain frequency band is higher than or equal to the preset radiation efficiency value, the radiation efficiency meets the electromagnetic wave receiving and transmitting condition, and the device can work in the frequency band with the radiation efficiency higher than or equal to the preset radiation efficiency value to a certain extent; when the radiation efficiency of a certain frequency band is lower than the preset radiation efficiency value, the radiation efficiency cannot meet the electromagnetic wave receiving and transmitting condition, and cannot work in the frequency band with the radiation efficiency lower than the preset radiation efficiency value.

In some embodiments, the preset radiant efficiency value may be-17 dB. It is clear that in some embodiments, the preset radiation efficiency value may also be other suitable values, for example, -15dB, -14dB values.

Wherein a predetermined frequency band is a desired operating frequency band of the antenna assembly 1, it is optimal that the radiation efficiency in a frequency range from the highest frequency of the predetermined frequency band to a higher frequency is reduced to a lower value, e.g. lower than the predetermined radiation efficiency value, and the radiation efficiency in a frequency range from the lowest frequency of the predetermined frequency band to a lower frequency is reduced to a lower value, e.g. lower than the predetermined radiation efficiency value. However, since the radiation efficiency generally cannot be suddenly changed, a certain buffer frequency interval is required, and generally, the buffer frequency interval is about 100MHz, so that the frequency selectivity is better, that is, the operation frequency band is selected, and the effect of suppressing the adjacent frequency bands of the operation frequency band is better. Therefore, in general, when the radiation efficiency in a frequency range from about 100MHz higher than the highest frequency of the preset frequency band is reduced to a lower value, and the radiation efficiency in a frequency range from about 100MHz lower than the lowest frequency of the preset frequency band is reduced to a lower value, effective suppression of adjacent frequency bands on both sides of the preset frequency band can be better achieved, and the radiation performance in the preset frequency band is ensured or improved.

Therefore, in the present application, when the first high-frequency corresponding to the first high-frequency radiation zero point is higher than the highest frequency of the preset frequency band and the frequency interval between the first high-frequency radiation zero point and the highest frequency of the preset frequency band is less than or equal to 350MHz, and the first low-frequency corresponding to the first low-frequency radiation zero point is higher than the lowest frequency of the preset frequency band and the frequency interval between the first low-frequency radiation zero point and the lowest frequency of the preset frequency band is less than or equal to 350MHz, the radiation efficiency of a certain frequency range around the first high-frequency can be reduced to a lower value approximately, and the interval between the lowest frequency around the first high-frequency range and the highest frequency of the preset frequency band is only about 100MHz, and the radiation efficiency of a certain frequency range around the first low-frequency range is reduced to a lower value approximately, and the interval between the highest frequency around the first low-frequency range and the lowest frequency of the preset frequency range is only about 100 MHz. Therefore, adjacent frequency bands near the lowest frequency of the preset frequency band can be effectively restrained.

In some embodiments, the preset frequency interval may also be other values, for example, 400MHz, 370MHz, 300MHz, etc., as long as the lowest frequency of a certain frequency range around the first high frequency is approximately close to the highest frequency of the preset frequency band and the highest frequency of a certain frequency range around the first low frequency is approximately close to the lowest frequency of the preset frequency band. For example, it is sufficient that the interval between the lowest frequency of the certain frequency range around the first high frequency and the highest frequency of the preset frequency band is close to 100MHz, for example 150MHz, and the interval between the highest frequency of the certain frequency range around the first low frequency and the lowest frequency of the preset frequency band is close to 100MHz, for example 150 MHz.

Wherein, as shown in fig. 1, in some embodiments, the radiating branch 11, the first parasitic branch 13, and the second parasitic branch 14 may be substantially straight, and the radiating branch 11, the first parasitic branch 13, and the second parasitic branch 14 may be substantially parallel.

In some embodiments, the radiating branch 11, the first parasitic branch 13, and the second parasitic branch 14 may also be bent strips, i.e., substantially "L" -shaped, to effectively reduce the overall volume.

Referring to fig. 4, another simple structure of the antenna assembly 1 according to some embodiments of the present application is shown. Wherein, as shown in fig. 4, in some embodiments, the antenna assembly 1 further comprises a first reinforcing branch Z1, the first reinforcing branch Z1 is disposed on a side of the first parasitic branch 13 adjacent to the radiation branch 11 and is electrically connected to the first parasitic branch 13, and the first reinforcing branch Z1 is used for reinforcing the magnetic field coupling of the first parasitic branch 13 and the radiation branch 11.

That is, in some embodiments, the antenna assembly 1 further includes a first reinforcing branch Z1 disposed at a side of the first parasitic branch 13 adjacent to the radiating branch 11 and electrically connected to the first parasitic branch 13, the first reinforcing branch Z1 may reduce a distance between the first parasitic branch 13 and the radiating branch 11 and/or increase an area opposite to the radiating branch 11, which may be advantageous to increase magnetic field coupling energy while reinforcing magnetic field coupling of the first parasitic branch 13 and the radiating branch 11.

In some embodiments, the first reinforcing branch Z1 is disposed at a side of the first parasitic branch 13 adjacent to the radiating branch 11, and at least a portion of the first reinforcing branch Z1 is adjacent to a region of the radiating branch 11 that is at the feed point F1. Thus, the first reinforcing branch Z1 may reduce the distance between the first parasitic branch 13 and the region of the feeding point F1 of the radiating branch 11 and increase the area opposite to the region of the feeding point F1 of the radiating branch 11, which may be more advantageous to increase the magnetic field coupling energy while reinforcing the magnetic field coupling of the first parasitic branch 13 and the radiating branch 11.

Wherein, in some embodiments, the first reinforcing branch Z1 and the first parasitic branch 13 may be an integrally formed conductive structure. Obviously, in other embodiments, the first reinforcing branch Z1 and the first parasitic branch 13 may be connected together by welding, conductive glue bonding, or the like.

In some embodiments, as shown in fig. 1 and 2, the radiating stub 11 is disposed between the first parasitic stub 13 and the second parasitic stub 14.

That is, in some embodiments, the first parasitic branch 13 and the second parasitic branch 14 may be disposed at both sides of the radiating branch 11, while facilitating the disposition of the second ground terminal G2 of the first parasitic branch 13 near the feed point F1 of the radiating branch 11, while effectively stimulating magnetic field coupling between the first parasitic branch 13 and the radiating branch 11, and facilitating the disposition of the third open end O3 of the second parasitic branch 14 near the first open end O1 of the radiating branch, while effectively stimulating electric field coupling between the second parasitic branch 14 and the radiating branch 11.

The two sides of the radiation branch 11 may be opposite sides in a direction substantially perpendicular to the extending direction of the radiation branch 11.

Obviously, in other embodiments, the first parasitic branch 13 and the second parasitic branch 14 may also be disposed on the same side of the radiating branch 11.

Referring to fig. 5, another simple structure of the antenna assembly 1 according to some embodiments of the present application is shown. As shown in fig. 5, in some embodiments, the first parasitic branch 13 is disposed between the radiating branch 11 and the second parasitic branch 14.

That is, in some embodiments, the first parasitic branch 13 and the second parasitic branch 14 may also be disposed on the same side of the radiating branch 11, with the first parasitic branch 13 disposed between the radiating branch 11 and the second parasitic branch 14. Thus, the first parasitic branch 13 is disposed closer to the radiation branch 11 than the second parasitic branch 14, so that magnetic field coupling between the first parasitic branch 13 and the radiation branch 11 can be ensured, and then, the third open end O3 of the second parasitic branch 14 is adjacent to the first open end O1 of the radiation branch 11, so that electric field coupling between the second parasitic branch 14 and the radiation branch 11 can be ensured.

In some embodiments, as shown in fig. 4-5, the antenna assembly further includes a dielectric substrate 16, the dielectric substrate 16 includes a first surface S1 and a second surface S2 opposite to each other, and the radiation branch 11, the first parasitic branch 13, and the second parasitic branch 14 are disposed on the first surface S1 of the dielectric substrate 16.

That is, in some embodiments, the radiation stub 11, the first parasitic stub 13, and the second parasitic stub 14 may be LDS (laser formed) metal structures formed on the dielectric substrate 16 by laser technology. The LDS antenna refers to a metal antenna pattern directly plated on the dielectric substrate 16 by laser technology. Alternatively, the radiating stub 11, the first parasitic stub 13, and the second parasitic stub 14 may also be FPC (flexible printed circuit, flexible circuit board) metal structures disposed on the dielectric substrate 16. The FPC antenna refers to a metal antenna pattern formed on the FPC, and the FPC antenna may be fixed on the dielectric substrate 16 by bonding, embedding, soldering, or the like.

The dielectric substrate 16 is made of an insulating material, such as a plastic material, a resin material, a ceramic material, or the like.

The dielectric substrate 16 is substantially plate-shaped, and the first surface S1 and the second surface S2 of the dielectric substrate 16 may specifically be two opposite surfaces with the largest area of the dielectric substrate 16.

Referring to fig. 6, a further schematic structure of the antenna assembly 1 according to some embodiments of the present application is shown. As shown in fig. 6, in some embodiments, the antenna assembly 1 further comprises a third parasitic stub 17 and a fourth parasitic stub 18. Wherein the third parasitic branch 17 is coupled to the radiation branch 11 and is magnetic field coupled for forming a second high frequency radiation zero at a second high frequency, wherein the second high frequency is higher than the highest frequency of the preset frequency band and the frequency interval between the second high frequency and the highest frequency of the preset frequency band is smaller than or equal to the preset frequency interval. The fourth parasitic branch 18 is coupled to the radiation branch 11 and is an electric field coupling for forming a second low frequency radiation zero at a second low frequency, wherein the second low frequency is lower than the lowest frequency of the preset frequency band and the frequency interval between the second low frequency and the lowest frequency of the preset frequency band is smaller than or equal to the preset frequency interval. Wherein the second high frequency is different from the first high frequency and the second low frequency is different from the first low frequency. Wherein in some embodiments, the third parasitic stub 17 and the fourth parasitic stub 18 are disposed on the second surface S2 of the dielectric substrate 16. Fig. 6 is a schematic view of the dielectric substrate 16 viewed from the first surface S1 side, and the third parasitic branch 17 and the fourth parasitic branch 18 provided on the second surface S2 of the dielectric substrate 16 are schematically shown by dotted lines.

Thus, in some embodiments, by further providing the third parasitic branch 17 and the fourth parasitic branch 18, the radiation zero may be formed at two different frequencies higher than the preset frequency band and close to the preset frequency band by the first parasitic branch 13 and the third parasitic branch 17, and the radiation zero may be formed at two different frequencies lower than the preset frequency band and close to the preset frequency band by the second parasitic branch 14 and the fourth parasitic branch 18, thereby, adjacent frequency bands on both sides of the preset frequency band may be further accurately suppressed, and the frequency selectivity of the preset frequency band may be improved.

The second high-frequency and the second low-frequency in the present application also refer to the high-frequency and the low-frequency relative to the preset frequency band, and do not refer to frequencies in the frequency band such as the high-frequency band or the low-frequency band in the 4G or 5G communication network. That is, as described above, the second high frequency is a frequency higher than the highest frequency of the preset frequency band and having a frequency interval with the highest frequency of the preset frequency band less than or equal to a preset frequency interval, and the second low frequency is a frequency lower than the lowest frequency of the preset frequency band and having a frequency interval with the lowest frequency of the preset frequency band less than or equal to a preset frequency interval.

When there are only two radiation zeros, i.e., the first high-frequency radiation zero and the first low-frequency radiation zero, the frequency range with the radiation efficiency lower than the preset radiation efficiency value may be narrower due to only one radiation zero, or the frequency interval between the frequency range with the radiation efficiency lower than the preset radiation efficiency value and the preset frequency band may be larger, so that the adjacent frequency band cannot be well suppressed. And by forming more radiation nulls, the problem is well addressed.

In some embodiments, the third parasitic branch 17 includes a fourth ground end G4 and a fourth open end O4, the fourth parasitic branch 18 includes a fifth ground end G5 and a fifth open end O5, the fourth ground end G4 and the fifth ground end G5 are grounded, wherein the fourth ground end G4 of the third parasitic branch 17 is closer to the feed point F1 of the radiating branch 11 than the fifth ground end G5 of the fourth parasitic branch 18, and the fifth open end O5 of the fourth parasitic branch 18 is adjacent to the first open end O1 of the radiating branch 11.

Wherein, as mentioned above, when the radiation branch 11 resonates, the electric field is mainly concentrated at the open end of the radiation branch 11, i.e. the first end 11a, and the magnetic field is concentrated at the feeding position of the radiation branch 11, i.e. near the feeding point F1, so when the fourth ground end G4 of the third parasitic branch 17 is adjacent to the feeding point F1 of the radiation branch 11 and is closer to the feeding point F1 of the radiation branch 11 than the fifth ground end G5 of the fourth parasitic branch 18, the third parasitic branch 17 will be magnetically coupled with the radiation branch 11, and the fifth open end O5 of the fourth parasitic branch 18 is adjacent to the first open end O1 of the radiation branch 11, and the fourth parasitic branch 18 will be electrically coupled with the radiation branch 11.

Wherein the proximity of the fifth open end O5 of the fourth parasitic branch 18 to the first open end O1 of the radiating branch 11 may mean that a distance between the fifth open end O5 of the fourth parasitic branch 18 and the first open end O1 of the radiating branch 11 is less than a preset distance, for example less than 1 cm.

Wherein in some embodiments, the thickness of the dielectric substrate 16 is small, for example, a value of less than 2mm (millimeters), and may be, for example, 0.8mm. Thus, in some embodiments, even if the radiation branch 11 is disposed on the first surface S1 of the dielectric substrate 16, the third parasitic branch 17 and the fourth parasitic branch 18 are disposed on the second surface S2 of the dielectric substrate 16, the third parasitic branch 17 and the radiation branch 11 may still be magnetically coupled, and the fourth parasitic branch 18 and the radiation branch 11 may still be electrically coupled.

As mentioned above, the equivalent electrical length of the radiating branch 11 meets the resonance requirement of the preset frequency band, in some embodiments, the resonance frequency corresponding to the equivalent electrical length of the third parasitic branch 17 is located between the preset frequency band and the second high-frequency band, the resonance frequency corresponding to the equivalent electrical length of the fourth parasitic branch 18 is located between the preset frequency band and the second low-frequency band, and when the third parasitic branch 17 and the radiating branch 11 are magnetically coupled, the currents at the second high-frequency bands in the radiating branch 11 and the third parasitic branch 17 are inverted, so as to form the second high-frequency radiation zero point. When the fourth parasitic branch 18 is coupled to the radiation branch 11 by an electric field, the currents at the second low frequency in the radiation branch and the fourth parasitic branch 18 are inverted to form a second low frequency radiation zero.

Wherein, the fact that the equivalent electrical length of the radiation branch 11 meets the resonance requirement of the preset frequency band may mean that the equivalent electrical length of the radiation branch 11 is λ ₁ 4, wherein the lambda ₁ And the wavelength corresponding to the preset frequency band is obtained. The resonant frequency corresponding to the equivalent electrical length of the third parasitic branch 17 refers to 1/4 of the wavelength corresponding to the equivalent electrical length of the third parasitic branch 17, and the resonant frequency corresponding to the equivalent electrical length of the fourth parasitic branch 18 refers to 1/4 of the wavelength corresponding to the equivalent electrical length of the fourth parasitic branch 18.

The resonant frequency corresponding to the equivalent electrical length of the third parasitic branch 17 is located between the preset frequency band and the second high-frequency, specifically, the resonant frequency corresponding to the equivalent electrical length of the third parasitic branch 17 is located between the highest frequency of the preset frequency band and the first high-frequency, the resonant frequency corresponding to the equivalent electrical length of the fourth parasitic branch 18 is located between the preset frequency band and the first low-frequency, and specifically, the resonant frequency corresponding to the equivalent electrical length of the fourth parasitic branch 18 is located between the lowest frequency of the preset frequency band and the first low-frequency.

In some embodiments, as previously described, the radiating stub 11 has an equivalent electrical length λ ₁ 4, said lambda ₁ And the wavelength corresponding to the preset frequency band is obtained. In some embodiments, the third parasitic branch 17 has an equivalent electrical length λ ₄ 4, wherein the lambda ₄ For the wavelength corresponding to the frequency between the preset frequency band and the second high-frequency band, the equivalent electrical length of the fourth parasitic branch 18 is λ ₅ 4, wherein the lambda ₅ And the wavelength is the wavelength corresponding to the frequency between the preset frequency band and the second low-frequency.

In some embodiments, the resonance frequency corresponding to the equivalent electrical length of the third parasitic branch 17 is located between the preset frequency band and the second high-frequency, and the third parasitic branch 17 may be designed in advance according to the frequency at which the second high-frequency radiation zero point is expected to occur, that is, the second high-frequency, so that the equivalent electrical length of the third parasitic branch 17 is 1/4 of the wavelength corresponding to a certain frequency located between the highest frequency of the preset frequency band and the second high-frequency. Likewise, the resonant frequency corresponding to the equivalent electrical length of the fourth parasitic branch 18 is located between the preset frequency band and the second low-frequency, and the fourth parasitic branch 18 may be designed in advance according to the frequency at which the second low-frequency radiation zero point is expected to occur, that is, the second low-frequency, so that the equivalent electrical length of the fourth parasitic branch 18 is 1/4 of the wavelength corresponding to a certain frequency located between the lowest frequency of the preset frequency band and the second low-frequency.

In some embodiments, the radiating branch 11 is parallel to the third parasitic branch 17 and the fourth parasitic branch 18.

Further, since the third parasitic branch 17 is magnetically coupled to the radiating branch 11, and the equivalent electrical length of the radiating branch 11 meets the resonance requirement of the preset frequency band, the resonance frequency corresponding to the equivalent electrical length of the third parasitic branch 17 is located between the preset frequency band and the second high frequency, so that the current at the second high frequency in the radiating branch 11 and the third parasitic branch 17 is inverted, and since the radiating branch 11 is parallel to the third parasitic branch 17, the directions of the currents at the second high frequency in the radiating branch 11 and the third parasitic branch 17 are opposite, so that the electromagnetic wave signals at the second high frequency generated by the radiating branch 11 and the third parasitic branch 17 cancel each other, which is equivalent to that the antenna assembly 1 has no signal at the second high frequency, and the radiation efficiency is almost zero, so as to form a second high-frequency radiation zero point. In addition, since the fourth parasitic branch 18 is electrically coupled to the radiation branch 11, and since the resonant frequency corresponding to the equivalent electrical length of the fourth parasitic branch 18 is located between the preset frequency band and the second low frequency band, the currents of the radiation branch 11 and the fourth parasitic branch 18 at the second low frequency band will be inverted, and since the radiation branch 11 is substantially parallel to the fourth parasitic branch 18, the directions of the currents of the radiation branch 11 and the fourth parasitic branch 18 at the second low frequency band are opposite, and the generated electromagnetic wave signals cancel each other, which is equivalent to that the antenna assembly 1 as a whole has no electromagnetic wave signal at the second low frequency band, and the radiation efficiency is almost zero, thereby forming a second low frequency radiation zero.

Wherein, again, the radiation branch 11 is parallel to the third parasitic branch 17 and the fourth parasitic branch 18, only for better implementation of the radiation zero. In some embodiments, the radiating branch 11 may not be parallel to the third parasitic branch 17 and the fourth parasitic branch 18, and the second high-frequency radiation zero may be substantially achieved by inverting the phases of the electromagnetic wave signals of the second high-frequency radiated into the free space through the radiating branch 11 and the third parasitic branch 17, respectively, only by inverting the currents at the second high-frequency in the radiating branch 11 and the third parasitic branch 17. Likewise, the second low frequency radiation zero point can be basically realized by inverting the phases of the electromagnetic wave signals of the second low frequency radiated into the free space through the radiation branch 11 and the fourth parasitic branch 18, respectively, only by inverting the currents of the radiation branch 11 and the fourth parasitic branch 18 at the second low frequency.

The third parasitic branch 17 and the fourth parasitic branch 18 are also stripe shapes, and the radiation branch 11 is substantially parallel to the third parasitic branch 17 and the fourth parasitic branch 18, which may mean that the extending directions of the radiation branch 11, the third parasitic branch 17 and the fourth parasitic branch 18 are substantially parallel. The extending directions of the radiating branch 11, the third parasitic branch 17, and the fourth parasitic branch 18 may be the extending directions of the longest sides of the radiating branch 11, the third parasitic branch 17, and the fourth parasitic branch 18.

In some embodiments, the third parasitic branch 17 and the fourth parasitic branch 18 may also be straight or bent strips. When the third parasitic branch 17 and the fourth parasitic branch 18 are straight, the longest sides of the third parasitic branch 17 and the fourth parasitic branch 18 may be the longest straight sides of the third parasitic branch 17 and the fourth parasitic branch 18. When the third parasitic branch 17 and the fourth parasitic branch 18 are bent strips, the longest sides of the third parasitic branch 17 and the fourth parasitic branch 18 may be the longest bent line sides of the third parasitic branch 17 and the fourth parasitic branch 18 extending along the bending direction.

In this application, the radiation branch 11 is also substantially parallel to the third parasitic branch 17 and the fourth parasitic branch 18, rather than strictly parallel, for example, the radiation branch 11 may be considered to be substantially parallel to the third parasitic branch 17 and the fourth parasitic branch 18 within a certain angle range, for example, 30 °.

When the third parasitic branch 17 is magnetically coupled to the radiating branch 11, the principle of inverting the current at the second high frequency in the radiating branch 11 and the third parasitic branch 17 is the same as that of inverting the current at the first high frequency in the radiating branch 11 and the first parasitic branch 13 when the first parasitic branch 13 is magnetically coupled to the radiating branch 11, and details related to fig. 2 will not be repeated here. The principle of inverting the current at the second low frequency in the radiation branch 18 and the fourth parasitic branch 18 when the fourth parasitic branch 18 and the radiation branch 11 are coupled in the electric field is the same as the principle of inverting the current at the first low frequency in the radiation branch 11 and the second parasitic branch 14 when the second parasitic branch 14 and the radiation branch 11 are coupled in the electric field, and details of the principle are not described in detail herein.

As shown in fig. 6, the antenna assembly 1 further includes a second reinforcing branch Z2, where the second reinforcing branch Z2 is disposed on a side of the fourth parasitic branch 18 adjacent to the radiation branch 11 and is electrically connected to the fourth parasitic branch 18, and the second reinforcing branch Z2 is used to strengthen electric field coupling between the fourth parasitic branch 18 and the radiation branch 11.

That is, in some embodiments, the antenna assembly 1 further includes a second reinforcing branch Z2 disposed at a side of the fourth parasitic branch 18 adjacent to the radiation branch 11 and electrically connected to the fourth parasitic branch 18, the second reinforcing branch Z2 may reduce a distance between the fourth parasitic branch 18 and the radiation branch 11 and/or increase an area opposite to the radiation branch 11, which may be advantageous to increase electric field coupling energy while reinforcing electric field coupling of the fourth parasitic branch 18 and the radiation branch 11.

In some embodiments, the second reinforcing branch Z2 is disposed on a side of the fourth parasitic branch 18 adjacent to the radiating branch 11, and at least a portion of the second reinforcing branch Z2 is adjacent to the first open end O1 of the radiating branch 11. Thus, the second reinforcing branch Z2 may reduce the distance between the fourth parasitic branch 18 and the first open end O1 of the radiating branch 11 and increase the area opposite to the first open end O1 of the radiating branch 11, which may be more advantageous for increasing electric field coupling energy while reinforcing electric field coupling of the fourth parasitic branch 18 and the radiating branch 11.

In some embodiments, the second reinforcing branch Z2 and the fourth parasitic branch 18 may be integrally formed conductive structures. Obviously, in other embodiments, the second reinforcing branch Z2 and the fourth parasitic branch 18 may be connected together by welding, conductive glue bonding, or the like.

In some embodiments, as shown in fig. 6, the projections of the third parasitic branch 17 and the fourth parasitic branch 18 on the first surface S1 of the dielectric substrate 16 are located on both sides of the radiation branch 11.

That is, in some embodiments, the projections of the third parasitic branch 17 and the fourth parasitic branch 18 on the first surface S1 of the dielectric substrate 16 are located on both sides of the radiation branch 11, that is, the third parasitic branch 17 and the fourth parasitic branch 18 are located approximately on both sides of the radiation branch 11. Therefore, it is convenient to place the fourth ground terminal G4 of the third parasitic branch 17 close to the feed point F1 of the radiating branch 11 while effectively exciting the magnetic field coupling between the third parasitic branch 17 and the radiating branch 11, and to place the fifth open end O5 of the fourth parasitic branch 18 close to the first open end O1 of the radiating branch while effectively exciting the electric field coupling between the fourth parasitic branch 18 and the radiating branch 11.

Obviously, in other embodiments, the projections of the third parasitic branch 17 and the fourth parasitic branch 18 on the first surface S1 of the dielectric substrate 16 may also be located on the same side of the radiation branch 11.

As described above, the thickness of the dielectric substrate 16 is small, so that the radiation branch 11 may be equivalent to being shared by the first parasitic branch 13, the second parasitic branch 14, the third parasitic branch 17, and the fourth parasitic branch 18, and thus, the radiation branch 11 may be magnetically coupled and electrically coupled to the first parasitic branch 13 and the second parasitic branch 14, or may be magnetically coupled and electrically coupled to the third parasitic branch 17 and the fourth parasitic branch 18, respectively.

Referring to fig. 7 and 8 together, fig. 7 is a schematic plan view illustrating a more specific structure of the antenna assembly 1 according to some embodiments of the present application. Fig. 8 is a schematic perspective view of a more specific structure of the antenna assembly 1 in some embodiments of the present application.

In which a more specific structural configuration of the radiating stub 11, the first parasitic stub 13 and the second parasitic stub 14 in the antenna assembly 1 in some embodiments is illustrated in fig. 7 and 8.

As shown in fig. 7 and 8, the radiating branch 11 includes a main branch 111, a feeding branch 112, and a grounding branch 113, one end of the main branch 111 is a first open-circuit end O1 of the radiating branch 11, the other end of the main branch 111 is connected to the feeding branch 112 and the grounding branch 113, the feeding point F1 is disposed on the feeding branch 112, one end of the grounding branch 113, which is not connected to the main branch 111, is a first grounding end G1 of the radiating branch 11, and the main branch 111 is parallel to the first parasitic branch 13, the second parasitic branch 14, the third parasitic branch 17, and the fourth parasitic branch 18.

That is, in some embodiments, the radiating stub 11 may include a main stub 111, a feed stub 112, and a ground stub 113 in some embodiments, where the feed stub 112 is primarily used for feeding, corresponding to the function of forming a part of a feed connection. And the ground stub 113 is mainly used for connection to ground. In some embodiments, the foregoing radiating branch 11 is parallel to the first and second parasitic branches 13, 14, and the radiating branch 11 is parallel to the third and fourth parasitic branches 17, 18 primarily refers to the main branch 111 being parallel to the first and second parasitic branches 13, 14.

In some embodiments, the main branch 111 of the radiating branch 11 mainly plays a role of radiation, so the equivalent electrical length of the radiating branch 11 is mainly the equivalent electrical length of the main branch 111. That is, in some embodiments, the equivalent electrical length of the main branch 111 may beLambda is lambda ₁ 4, wherein the lambda ₁ And the wavelength corresponding to the preset frequency band is obtained.

In some embodiments, the main branch 111, the feed branch 112, and the ground branch 113 are integrally formed conductive structures. Obviously, in other embodiments, the main branch 111, the feeding branch 112 and the grounding branch 113 may be connected together by welding, conductive glue bonding, or the like.

Wherein, as shown in fig. 7 and 8, the main branch 111 further includes a first branch portion 1111 and a second branch portion 1112, the first branch portion 1111 and the second branch portion 1112 are vertically connected, the second branch portion 1112 is connected with the feeding branch 112 and the ground branch 113, and the second branch portion 1112 is the same as the extension direction of the feeding branch 112. As shown in fig. 7 and 8, the first parasitic branch 13 includes a first parasitic main branch 131 and a first parasitic ground branch 132, and the first parasitic main branch 131 and the first parasitic ground branch 132 are vertically connected and respectively parallel to the first branch portion 1111 and the second branch portion 1112; the second parasitic branch 14 includes a second parasitic main branch 141 and a second parasitic ground branch 142, and the second parasitic main branch 141 and the second parasitic ground branch 142 are vertically connected and also respectively parallel to the first branch portion 1111 and the second branch portion 1112. Wherein the third parasitic branch 17 includes a third parasitic main branch 171 and a third parasitic ground branch 172, the third parasitic main branch 171 and the third parasitic ground branch 172 are vertically connected and also respectively parallel to the first branch portion 1111 and the second branch portion 1112; the fourth parasitic branch 18 includes a fourth parasitic main branch 181 and a fourth parasitic ground branch 182, and the fourth parasitic main branch 181 and the fourth parasitic ground branch 182 are vertically connected and also respectively parallel to the first branch portion 1111 and the second branch portion 1112.

That is, in some embodiments, the main branch 111 of the radiation branch 11 is substantially in an "L" shape structure, the first parasitic branch 13, the second parasitic branch 14, the third parasitic branch 17, and the fourth parasitic branch 18 are also substantially in an "L" shape structure, the main branch 111 is parallel to the first parasitic branch 13, the second parasitic branch 14, the third parasitic branch 17, and the fourth parasitic branch 18, specifically, the first branch portion 1111 and the second branch portion 1112 are parallel to the first parasitic main branch 131 and the first parasitic ground branch 132 of the first parasitic branch 13, and are parallel to the second parasitic main branch 141 and the second parasitic ground branch 142 of the second parasitic branch 14, and are parallel to the third main branch 171 and the third parasitic ground branch 172 of the third parasitic branch 17, and are parallel to the fourth parasitic branch 181 and the fourth parasitic branch 181 of the fourth parasitic branch 18, respectively.

Thus, in some embodiments, the main branch 111 of the radiating branch 11 has a substantially L-shaped structure, and the first, second, third and fourth parasitic branches 13, 14, 17 and 18 have a substantially L-shaped structure, so that the overall size of the antenna assembly 1 can be effectively reduced while ensuring that the electrical length meets the requirements, which is advantageous for volume miniaturization.

As shown in fig. 7 and 8, the first reinforcing branch Z1 may be specifically disposed at a side of the end of the first parasitic main branch 131 adjacent to the first parasitic ground branch 132, which is adjacent to the radiating branch 11. The second reinforcing branch Z2 may be specifically disposed at a side of the fourth parasitic main branch 181, which is far from an end portion close to the fourth parasitic ground branch 182, and which is adjacent to the first open end O1 of the radiation branch 11.

As mentioned above, the resonant frequency corresponding to the equivalent electrical length of the second parasitic branch 14 is located between the preset frequency band and the first low frequency band, that is, between the lowest frequency in the preset frequency band and the first low frequency band, so that the equivalent electrical length of the second parasitic branch 14 needs to be greater than the equivalent electrical lengths of the radiating branch 11 and the first parasitic branch 13, and therefore, in some embodiments, the gap K1 may also be formed on the second parasitic main branch 141, so that the overall size of the second parasitic branch 14 does not need to be increased while the equivalent electrical length of the second parasitic branch 14 is increased, which is also beneficial to volume miniaturization. Likewise, the resonant frequency corresponding to the equivalent electrical length of the fourth parasitic branch 18 is located between the preset frequency band and the second low frequency band, that is, between the lowest frequency in the preset frequency band and the second low frequency band, so that the equivalent electrical length of the fourth parasitic branch 18 needs to be greater than the equivalent electrical lengths of the radiation branch 11 and the third parasitic branch 17, etc., and therefore, in some embodiments, the fourth parasitic main branch 181 may further form a notch K1, which also can increase the equivalent electrical length of the fourth parasitic branch 18 without increasing the overall size of the fourth parasitic branch 18, which is also beneficial to volume miniaturization.

In fig. 7 and 8, the first parasitic branch 13 and the second parasitic branch 14 are disposed on two sides of the radiation branch 11, and the projections of the third parasitic branch 17 and the fourth parasitic branch 18 on the first surface S1 of the dielectric substrate are illustrated as being located on two sides of the radiation branch 11. As described above, the positional relationship of the branches may be adjusted as needed, as long as the magnetic field coupling and the electric field coupling are ensured, respectively.

In some embodiments, the frequency range of the preset frequency band is 2.2 GHz-2.5 GHz. Obviously, the frequency range of the preset frequency band may be any other frequency range, for example, a frequency range of a low-frequency band, for example, 700 MHz-1000 MHz, and so on.

Fig. 9 is a schematic diagram of a return loss curve of the antenna assembly 1 according to some embodiments of the present application. Fig. 9 may be a schematic diagram of a return loss curve obtained by performing a simulation test, taking the antenna assembly 1 shown in fig. 7 and 8 as an example, and operating in a preset frequency band.

In which fig. 9 illustrates a return loss curve S11. Wherein, as shown in fig. 7 and 8, when the first high-frequency radiation zero is formed by the first parasitic branch 13 and the second high-frequency radiation zero is formed by the third parasitic branch 17, and when the first low-frequency radiation zero is formed by the second parasitic branch 14 and the second low-frequency radiation zero is formed by the fourth parasitic branch 18, the frequency range of the return loss lower than-6 dB is approximately 2.15GHz to 2.55GHz.

The lower the return loss of a certain frequency band, the better the radiation performance of the antenna assembly 1 in the frequency band, the higher the radiation efficiency, and in general, the better the radiation performance when the return loss is lower than-6 dB. Therefore, as can be seen from fig. 9, when the first high-frequency radiation zero is formed by the first parasitic branch 13 and the second high-frequency radiation zero is formed by the third parasitic branch 17, and when the first low-frequency radiation zero is formed by the second parasitic branch 14 and the second low-frequency radiation zero is formed by the fourth parasitic branch 18, it is possible to have a lower return loss and a better antenna radiation performance in a preset frequency band having a frequency range of 2.15GHz to 2.55 GHz. And the frequency range of 2.15 GHz-2.55 GHz is very close to the frequency range of 2.2 GHz-2.5 GHz corresponding to the preset frequency band, so that good frequency selectivity can be realized.

Fig. 10 is a schematic diagram illustrating radiation efficiency curves of the antenna assembly 1 according to some embodiments of the present application. Fig. 10 is a schematic diagram of radiation efficiency curves obtained by performing simulation tests on the antenna assembly 1 shown in fig. 7 and 8 operating in a preset frequency band.

In fig. 10, the radiation efficiency curve Sr1 is schematically shown, and as mentioned above, forming a radiation zero at a certain frequency means that the radiation efficiency at the frequency is very low, and is approximately zero, where the radiation zero is also the trough point of the radiation efficiency, that is, the trough point of the radiation efficiency curve. As shown in fig. 10, the antenna assembly 1 in the present application, in which the first high-frequency radiation zero is formed by the first parasitic branch 13 and the second high-frequency radiation zero is formed by the third parasitic branch 17, and in which the first low-frequency radiation zero is formed by the second parasitic branch 14 and the second low-frequency radiation zero is formed by the fourth parasitic branch 18, four radiation efficiency trough points, that is, four radiation zero points, appear. Specifically, the first high-frequency radiation zero H10 and the second high-frequency radiation zero H20 distributed on the high-frequency side of the preset frequency band, and the first low-frequency radiation zero L10 and the second low-frequency radiation zero L20 distributed on the low-frequency side of the preset frequency band are shown in fig. 10.

As can be seen from the radiation efficiency curve Sr1 of fig. 10, the frequency corresponding to the first high-frequency radiation zero H10, that is, the first high-frequency is approximately 2.65GHz, the frequency corresponding to the second high-frequency radiation zero H20, that is, the second high-frequency is approximately 2.8GHz, and the frequency interval between the second high-frequency radiation zero H10 and the highest frequency 2.5GHz of the preset frequency band is smaller than the preset frequency interval. The frequency corresponding to the first low-frequency radiation zero L10, that is, the first low-frequency is approximately 2.1GHz, and the frequency interval between the frequency corresponding to the second low-frequency radiation zero L20, that is, the second low-frequency is approximately 1.96GHz and the lowest frequency 2.2GHz of the preset frequency band is smaller than the preset frequency interval.

As mentioned above, when a certain frequency is the radiation zero point, the radiation efficiency in a certain frequency range around the surrounding is pulled down to a lower value. As shown in fig. 10, since the second high-frequency radiation zero H20 is further formed by the third parasitic branch 17 and the second low-frequency radiation zero L20 is formed by the fourth parasitic branch 18, the radiation efficiency corresponding to the first high-frequency radiation zero H10 is approximately-18 dB, the radiation efficiency corresponding to the first low-frequency radiation zero L10 is approximately-19 dB, the radiation efficiency corresponding to the second high-frequency radiation zero H20 is approximately-21 dB, and the radiation efficiency corresponding to the second low-frequency radiation zero L20 is approximately-27 dB, which is already substantially equal to the radiation zero with the radiation efficiency of zero.

And as shown in fig. 10, due to the presence of the first high-frequency radiation zero H10 and the second high-frequency radiation zero H20, the radiation efficiency in the frequency range of about 2.6GHz to 2.8GHz is lower than the preset radiation efficiency value, for example-17 dB, and due to the presence of the first low-frequency radiation zero L10 and the second low-frequency radiation zero L20, the radiation efficiency in the frequency range of about 1.9GHz to 2.1GHz is lower than the preset radiation efficiency value, for example-17 dB.

It can be seen that the antenna assembly 1 of the present application has good frequency selectivity, a stop band bandwidth and a stop band depth when the first high-frequency radiation zero is formed by the first parasitic branch 13 and the second high-frequency radiation zero is formed by the third parasitic branch 17, and the first low-frequency radiation zero is formed by the second parasitic branch 14 and the second low-frequency radiation zero is formed by the fourth parasitic branch 18, and the efficiency on both sides of the preset frequency band is lower than-17 dB, the stop band bandwidth is greater than 200MHz, and the minimum in-stop band efficiency is lower than-27 dB; meanwhile, the radiation efficiency in the preset frequency band is larger than-1.75 dB, the adjacent frequency bands of the preset frequency band are effectively restrained, and the radiation efficiency in the preset frequency band is effectively improved.

Wherein, as shown in fig. 10, in some embodiments, the first high-frequency is approximately 2.65GHz, and the frequency corresponding to the second high-frequency radiation zero H20, that is, the second high-frequency is approximately 2.8GHz, and the first high-frequency is lower than the second high-frequency; the frequency corresponding to the first low-frequency radiation zero L10, that is, the first low-frequency is approximately 2.1GHz, the frequency corresponding to the second low-frequency radiation zero L20, that is, the second low-frequency is approximately 1.96GHz, and the first low-frequency is higher than the second low-frequency. In other embodiments, the first high frequency may also be higher than the second high frequency and the first low frequency may also be lower than the second low frequency.

Referring to fig. 11, a normalized radiation pattern of the antenna assembly 1 according to some embodiments of the present application is shown.

The normalized radiation pattern shown in fig. 11 may be obtained by performing a simulation test, for example, in which the antenna assembly 1 shown in fig. 7 and 8 operates in a preset frequency band. Specifically, the plane in which the antenna assembly 1 is located is an XOY plane (for example, as shown in fig. 14 below), that is, the plane in which the radiation branch 11, the first parasitic branch 13, and the like of the antenna assembly 1 are located is an XOY plane, the direction perpendicular to the plane in which the antenna assembly 1 is located is the Z direction, and fig. 11 may be a normalized radiation pattern of the XOZ plane that intercepts the three-dimensional radiation pattern. Wherein, the X direction may be a direction parallel to the extending direction of the first branch portion 1111 of the radiation branch 11, and the Y direction may be a direction perpendicular to the extending direction of the first branch portion 1111 of the radiation branch 11.

As can be seen from fig. 11, the main radiation direction, i.e. the beam direction, of the antenna assembly 1 is mainly two opposite directions in the X direction, i.e. in the two directions of 0 ° and 180 ° in fig. 11, which are also both ends in the extending direction of the first stub portion 1111, thus having good directivity.

Referring to fig. 12, another normalized radiation pattern of the antenna assembly 1 in some embodiments of the present application is shown.

The normalized radiation pattern shown in fig. 12 may also be obtained by performing a simulation test on the antenna assembly 1 shown in fig. 1 and 8 operating in a preset frequency band. Specifically, fig. 12 is a normalized radiation pattern of the YOZ plane taken from the stereoscopic radiation pattern. Here, as described above, the X direction may be a direction parallel to the extending direction of the first branch portion 1111 of the radiation branch 11, and the Y direction may be a direction perpendicular to the extending direction of the first branch portion 1111 of the radiation branch 11.

As can be seen from fig. 12, on the YOZ plane, the beam directions of the antenna assembly 1 are relatively balanced, so that a certain omnidirectional radiation characteristic can be realized.

Therefore, in the antenna assembly 1 in the present application, the first parasitic branch 13 is coupled with the radiating branch 11 and is a magnetic field coupling, so as to form a first high-frequency radiation zero point at a first high-frequency, and the second parasitic branch 14 is coupled with the radiating branch 11 and is an electric field coupling, so as to form a first low-frequency radiation zero point at a first low-frequency, thereby, through the first parasitic branch 13 and the second parasitic branch 14, a first high-frequency radiation zero point and a first low-frequency radiation zero point can be formed at two sides of the preset frequency band respectively, and the frequency interval between the frequency corresponding to the first high-frequency radiation zero point and the highest frequency of the preset frequency band and the frequency interval between the frequency corresponding to the first low-frequency radiation zero point and the lowest frequency of the preset frequency band are both smaller than or equal to the preset frequency interval, so that the radiation efficiency of the nearby frequency band of the preset frequency band can be lowered, and the nearby frequency band of the preset frequency band can be effectively inhibited, and the extra-free working performance of the preset frequency band is ensured, and the additional space is saved because the filter is not required.

In addition, when the antenna component 1 forms the second high-frequency radiation zero point through the third parasitic branch 17 in addition to the first high-frequency radiation zero point through the first parasitic branch 13, and forms the second low-frequency radiation zero point through the fourth parasitic branch 18 in addition to the first low-frequency radiation zero point through the second parasitic branch 14, the antenna component 1 can have better frequency selectivity, a stop band bandwidth and a stop band depth, the efficiency at two sides of the preset frequency band is lower than-15 dB, the stop band bandwidth is higher than 200MHz, and the minimum in-stop band efficiency is lower than-27 dB; meanwhile, the radiation efficiency in the preset frequency band is larger than-1.75 dB, the adjacent frequency bands of the preset frequency band are effectively restrained, and the radiation efficiency in the preset frequency band is effectively improved.

Referring to fig. 13, a block diagram of an electronic device 100 according to some embodiments of the present application is shown. Wherein, as shown in fig. 13, the electronic device 100 may comprise an antenna assembly 1. The antenna assembly 1 may be the antenna assembly 1 in any of the foregoing embodiments.

Therefore, in the electronic device 100 of the present application, the filtering function is integrated through the antenna assembly 1 itself, and the suppression of the nearby frequency band of the preset frequency band can be effectively achieved without adding an independent filter, so as to ensure the radiation performance working in the preset frequency band.

Please refer to fig. 14, which is a schematic diagram illustrating a part of the internal structure of the electronic device 100. As shown in fig. 14, the electronic device 100 further comprises a ground plate 2, the ground plate 2 being adapted to provide a ground potential.

The ground may be the ground plate 2. For example, the ground ends of the radiating branch 11, the first parasitic branch 13, the second parasitic branch 14, the third parasitic branch 17, and the fourth parasitic branch 18 may be connected to the ground plate 2 to be grounded.

Wherein, in some embodiments, the ground plate 2 may be a middle frame of the electronic device 100.

As shown in fig. 14, at least the radiating stub 11, the first parasitic stub 13, and the second parasitic stub 14 in the antenna assembly 1 are disposed adjacent to one end D1 of the ground plane 2. For example, the radiating stub 11, the first parasitic stub 13, the second parasitic stub 14, the third parasitic stub 17, the fourth parasitic stub 18, and the like of the antenna assembly 1 may be disposed in an area adjacent to the one end D1 of the ground plate 2, and the ground ends of the radiating stub 11, the first parasitic stub 13, the second parasitic stub 14, the third parasitic stub 17, and the fourth parasitic stub 18 may be directly connected to the end surface of the end D1 of the ground plate 2 to be grounded.

As shown in fig. 14, in some embodiments, when the antenna assembly 1 further includes a dielectric substrate 16, the dielectric substrate 16 may be stacked with the ground plane 2, and the target portion 161 of the dielectric substrate 16 extends beyond the end D1 of the ground plane 2, and the radiating branch 11, the first parasitic branch 13, the second parasitic branch 14, the third parasitic branch 17, and the fourth parasitic branch 18 of the antenna assembly 1 are disposed at the target portion 161 of the dielectric substrate 16. For example, the first and second parasitic branches 13, 14 are disposed on a first surface S1 of the target portion 161 of the dielectric substrate 16 facing the ground plate 2, while the third and fourth parasitic branches 17, 18 are disposed on a second surface S2 of the target portion 161 of the dielectric substrate 16 facing away from the ground plate 2.

When the dielectric substrate 16 and the ground plate 2 are stacked, the dielectric substrate 16 may be disposed on a side of the ground plate 2 facing away from the display screen, that is, the dielectric substrate 16 may be closer to the back side of the electronic device 100 than the ground plate 2.

Fig. 14 and the foregoing views of fig. 1 may be schematic views from the display screen side of the electronic device 100.

Obviously, in some embodiments, the dielectric substrate 16 may also include only the target portion 161 located on the side of the end D1 of the ground plate 2, without being disposed in a stacked manner with the ground plate 2. For example, the dielectric substrate 16 may be fixed to a position corresponding to the end D1 of the ground plate 2 on the inner periphery of the frame of the electronic device 100, or to an end surface of the end D1 of the ground plate 2.

Please refer to fig. 15, which is a schematic plan view of the electronic device 100 according to some embodiments of the present application. As shown in fig. 15, the electronic device 100 includes a top end D11, a bottom end D12, and two side ends D13, where at least the radiating stub 11, the first parasitic stub 13, and the second parasitic stub 14 in the antenna assembly 1 are disposed adjacent to one end D1 of the ground plane 2, and the end D1 of the ground plane 2 may be an end near the top end D11 of the electronic device 100.

Thus, as shown in fig. 15, most of the structure of the antenna assembly 1 is located substantially at the top end D11 of the electronic device 100. It is obvious that in other embodiments, the end D1 of the ground plate 2 may be an end close to the bottom end D12 of the electronic device 100, or the end D1 of the ground plate 2 may be an end close to one of the side ends D13 of the electronic device 100, and most of the structure of the antenna assembly 1 may also be located substantially at the bottom end D12 or one of the side ends D13 of the electronic device 100.

As shown in fig. 15, the electronic device further includes a motherboard 3, and the feed source 12 and the like may be disposed on the motherboard 3. As shown in fig. 15, the electronic device 100 may include a middle frame 4, and as described above, the ground plate 2 may be the middle frame 4.

In some embodiments, as shown in fig. 15, the electronic device 100 may further include a frame 5, and in some embodiments, the radiating branch 11, the first parasitic branch 13, the second parasitic branch 14, the third parasitic branch 17, the fourth parasitic branch 18, and the like of the antenna assembly 1 may also be a plurality of branches formed on the frame 5 by slit separation. For example, on a frame surface of the frame 5 facing the end surface of the end D1 of the ground plate 2, the radiation branch 11, the first parasitic branch 13, the second parasitic branch 14, the third parasitic branch 17, the fourth parasitic branch 18, and the like may be formed separately by a slit penetrating the frame surface, at a portion of the frame 5 near the end D1 of the ground plate 2. Wherein the gap may be filled with an insulating material while maintaining the integrity of the rim 5.

In some embodiments, the electronic device 100 further includes a memory, a battery, etc., which are not described in detail herein, since they are not related to the improvement of the present application.

The electronic device 100 of the present application may be any electronic device with an antenna, such as a mobile phone, a tablet computer, a notebook computer, and the like.

According to the electronic device 100 and the antenna assembly 1 thereof, the first parasitic branch 13 is coupled with the radiation branch 11 and is in magnetic field coupling, so that a first high-frequency radiation zero point is formed at a first high-frequency position, and the second parasitic branch 14 is coupled with the radiation branch 11 and is in electric field coupling, so that a first low-frequency radiation zero point is formed at a first low-frequency position, therefore, through the first parasitic branch 13 and the second parasitic branch 14, a first high-frequency radiation zero point and a first low-frequency radiation zero point can be formed at two sides of a preset frequency band respectively, and the frequency interval between the frequency corresponding to the first high-frequency radiation zero point and the highest frequency of the preset frequency band and the frequency interval between the frequency corresponding to the first low-frequency radiation zero point and the lowest frequency of the preset frequency band are smaller than or equal to the preset frequency interval, so that the radiation efficiency of a nearby frequency band of the preset frequency band can be lowered, the nearby frequency band of the preset frequency band can be effectively restrained, the nearby radiation zero point of the preset frequency band can be effectively restrained, the extra cost can be saved due to the fact that the extra working space is not required to be increased. In addition, when the electronic device 100 and the antenna assembly 1 of the present application form the second high-frequency radiation zero through the third parasitic branch 17 in addition to the first high-frequency radiation zero through the first parasitic branch 13, and form the second low-frequency radiation zero through the fourth parasitic branch 18 in addition to the first low-frequency radiation zero through the second parasitic branch 14, the frequency selectivity is better, the stopband bandwidth and the stopband depth are better, the stopband bandwidths with the efficiency lower than-15 dB on both sides of the preset frequency band are both greater than 200MHz, and the minimum in-stopband efficiency is lower than-27 dB; meanwhile, the radiation efficiency in the preset frequency band is larger than-1.75 dB, the adjacent frequency bands of the preset frequency band are effectively restrained, and the radiation efficiency in the preset frequency band is effectively improved.

Various embodiments of the present application are directed to structures that are not specifically described in some embodiments, and in no way conflict, reference may be made to the contents of corresponding structures in other embodiments.

The foregoing description is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and should be covered in the scope of the present application; embodiments of the present application and features of embodiments may be combined with each other without conflict. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (25)

1. An antenna assembly, the antenna assembly comprising:

radiation branches including feed points;

the feed source is connected with the feed point and is used for exciting the radiation branch to work in a preset frequency band;

the first parasitic branch is coupled with the radiation branch and is in magnetic field coupling, so that a first high-frequency radiation zero point is formed at a first high-frequency, wherein the first high-frequency is higher than the highest frequency of the preset frequency band, and the frequency interval between the first high-frequency and the highest frequency of the preset frequency band is smaller than or equal to the preset frequency interval;

The second parasitic branch is coupled with the radiation branch and is electric field coupling, so that a first low-frequency radiation zero point is formed at a first low-frequency, wherein the first low-frequency is lower than the lowest frequency of the preset frequency band, and the frequency interval between the first low-frequency and the lowest frequency of the preset frequency band is smaller than or equal to the preset frequency interval.

2. The antenna assembly of claim 1, wherein the radiating stub further comprises a first ground terminal and a first open end, the feed point being located between the first ground terminal and the first open end.

3. The antenna assembly of claim 2, wherein the first parasitic branch includes a second ground end and a second open end, the second parasitic branch includes a third ground end and a third open end, the second ground end and the third ground end are grounded, wherein the second ground end of the first parasitic branch is closer to the feed point of the radiating branch than the third ground end of the second parasitic branch, the third open end of the second parasitic branch is adjacent to the first open end of the radiating branch.

4. The antenna assembly of claim 3, wherein an equivalent electrical length of the radiating branch meets a resonance requirement of a preset frequency band, a resonance frequency corresponding to the equivalent electrical length of the first parasitic branch is located between the preset frequency band and the first high-frequency, a resonance frequency corresponding to the equivalent electrical length of the second parasitic branch is located between the preset frequency band and the first low-frequency, and when the first parasitic branch is magnetically coupled with the radiating branch, currents at the second high-frequency frequencies in the radiating branch and the first parasitic branch are inverted to form a first high-frequency radiation zero; when the second parasitic branch is coupled with the radiation branch by an electric field, currents at the second low-frequency in the radiation branch and the second parasitic branch are inverted to form a second low-frequency radiation zero.

5. The antenna assembly of claim 4, wherein the radiating stub has an equivalent electrical length λ ₁ 4, said lambda ₁ For the wavelength corresponding to the preset frequency band, the equivalent electrical length of the first parasitic branch is lambda ₂ 4, wherein the lambda ₂ For the preset frequency band and the preset frequency bandA wavelength corresponding to the frequency between the second high frequency, the equivalent electrical length of the second parasitic branch being lambda ₃ 4, wherein the lambda ₃ And the wavelength is the wavelength corresponding to the frequency between the preset frequency band and the second low-frequency.

6. The antenna assembly of claim 4, wherein the radiating branch is parallel to the first parasitic branch and the second parasitic branch.

7. The antenna assembly of claim 1, further comprising a first stiffening stub disposed on a side of the first parasitic stub adjacent the radiating stub and electrically connected to the first parasitic stub, the first stiffening stub for stiffening magnetic field coupling of the first parasitic stub with the radiating stub.

8. The antenna assembly of claim 1, wherein the radiating stub is disposed between the first parasitic stub and the second parasitic stub.

9. The antenna assembly of any one of claims 1-8, further comprising a dielectric substrate including opposing first and second surfaces, the radiating stub, the first parasitic stub, and the second parasitic stub being disposed on the first surface of the dielectric substrate.

10. The antenna assembly of claim 9, wherein the antenna assembly further comprises:

a third parasitic branch coupled to the radiating branch and being magnetic field coupled for forming a second high frequency radiation zero at a second high frequency, wherein the second high frequency is higher than a highest frequency of the preset frequency band and a frequency interval between the second high frequency and the highest frequency of the preset frequency band is less than or equal to a preset frequency interval;

a fourth parasitic branch coupled to the radiating branch and being an electric field coupling for forming a second low frequency radiation zero at a second low frequency, wherein the second low frequency is lower than a lowest frequency of the preset frequency band and a frequency interval between the second low frequency and the lowest frequency of the preset frequency band is less than or equal to a preset frequency interval;

the second high-frequency is different from the first high-frequency, and the second low-frequency is different from the first low-frequency, wherein the third parasitic branch and the fourth parasitic branch are arranged on the second surface of the dielectric substrate.

11. The antenna assembly of claim 10, wherein the third parasitic branch includes a fourth ground end and a fourth open end, the fourth parasitic branch including a fifth ground end and a fifth open end, the fourth ground end and the fifth ground end being grounded, wherein the fourth ground end of the third parasitic branch is closer to the feed point of the radiating branch than the fifth ground end of the fourth parasitic branch, the fifth open end of the fourth parasitic branch being adjacent to the first open end of the radiating branch.

12. The antenna assembly of claim 11, wherein an equivalent electrical length of the radiating branch meets a resonance requirement of a preset frequency band, a resonance frequency corresponding to an equivalent electrical length of the third parasitic branch is located between the preset frequency band and the second high frequency, a resonance frequency corresponding to an equivalent electrical length of the fourth parasitic branch is located between the preset frequency band and the second low frequency, and when the third parasitic branch is magnetically coupled with the radiating branch, currents at the second high frequency in the radiating branch and the third parasitic branch are inverted to form a second high frequency radiation zero; when the fourth parasitic branch is coupled with the radiation branch by an electric field, currents at the second low-frequency in the radiation branch and the fourth parasitic branch are inverted to form a second low-frequency radiation zero.

13. The antenna assembly of claim 12, wherein the radiating stub has an equivalent electrical length λ ₁ 4, said lambda ₁ The equivalent electrical length of the third parasitic branch is lambda for the wavelength corresponding to the preset frequency band ₄ 4, wherein the lambda ₄ For the wavelength corresponding to the frequency between the preset frequency band and the second high-frequency, the equivalent electrical length of the fourth parasitic branch is lambda ₅ 4, wherein the lambda ₅ And the wavelength is the wavelength corresponding to the frequency between the preset frequency band and the second low-frequency.

14. The antenna assembly of claim 12, wherein the radiating branch is parallel to the third and fourth parasitic branches.

15. The antenna assembly of claim 10, further comprising a second reinforcing stub disposed on a side of the fourth parasitic stub adjacent the radiating stub and electrically connected to the fourth parasitic stub, the second reinforcing stub for reinforcing electric field coupling of the fourth parasitic stub with the radiating stub.

16. The antenna assembly of claim 10, wherein projections of the third and fourth parasitic branches on the first surface of the dielectric substrate are located on both sides of the radiating branch.

17. The antenna assembly of claim 10, wherein the radiating stub comprises a main stub, a feed stub, and a ground stub, wherein one end of the main stub is a first open end of the radiating stub, the other end of the main stub is connected to the feed stub and the ground stub, the feed point is disposed at the feed stub, and one end of the ground stub not connected to the main stub is a first ground end of the radiating stub, the main stub being parallel to the first, second, third, and fourth parasitic stubs.

18. The antenna assembly of claim 17, wherein the main branch includes a first branch portion and a second branch portion, the first branch portion and the second branch portion are vertically connected, the second branch portion is connected with the feed branch and the ground branch, and the second branch portion is the same as the feed branch in the extending direction; the first parasitic branch comprises a first parasitic main branch and a first parasitic grounding branch, and the first parasitic main branch and the first parasitic grounding branch are vertically connected and are respectively parallel to the first branch part and the second branch part; the second parasitic branch comprises a second parasitic main branch and a second parasitic grounding branch, which are vertically connected and are also respectively parallel to the first branch part and the second branch part; the third parasitic branch comprises a third parasitic main branch and a third parasitic grounding branch, which are vertically connected and are also respectively parallel to the first branch part and the second branch part; the fourth parasitic branch includes a fourth parasitic main branch and a fourth parasitic ground branch, which are vertically connected and are also respectively parallel to the first branch portion and the second branch portion.

19. The antenna assembly of claim 18, wherein the ground stub of the radiating stub is connected to a second parasitic ground stub of the second parasitic stub and is commonly grounded.

20. The antenna assembly of claim 1, wherein the predetermined frequency interval is 350MHz.

21. The antenna assembly of claim 1, wherein the predetermined frequency band has a frequency range of 2.2GHz to 2.5GHz.

22. An electronic device comprising the antenna assembly of any one of claims 1-21.

23. The electronic device of claim 22, further comprising a ground plate for providing a ground potential.

24. The electronic device of claim 23, wherein at least the radiating stub, the first parasitic stub, and the second parasitic stub in the antenna assembly are disposed adjacent one end of the ground plane.

25. The electronic device of claim 24, wherein when the antenna assembly further comprises a dielectric substrate, the dielectric substrate is disposed in a stack with the ground plane, and a target portion of the dielectric substrate extends beyond the end of the ground plane, at least the radiating stub, the first parasitic stub, and the second parasitic stub are disposed at the target portion of the dielectric substrate.