CN111613880A - Antenna structure and electronic device - Google Patents
Antenna structure and electronic device Download PDFInfo
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- CN111613880A CN111613880A CN202010522100.6A CN202010522100A CN111613880A CN 111613880 A CN111613880 A CN 111613880A CN 202010522100 A CN202010522100 A CN 202010522100A CN 111613880 A CN111613880 A CN 111613880A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0053—Selective devices used as spatial filter or angular sidelobe filter
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
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Abstract
The application discloses antenna structure and electronic equipment belongs to communication technology field, and this antenna structure includes: the antenna structure comprises an antenna body and a first antenna node, wherein a first distance between the first antenna node and the antenna feed point is matched with a first inhibition frequency band central frequency point of the antenna structure; the first end of the first phase modulation arm is connected with the first antenna node; the adjustable varactor is used for adjusting a first inhibition frequency band central frequency point to a first target inhibition frequency band central frequency point under the condition that a first preset electric signal is obtained, and the current phase of the first phase modulation arm is opposite to the current phase of the antenna body under the condition that the first phase modulation arm obtains a resonance frequency which accords with the first target inhibition frequency band central frequency point. The embodiment of the application can improve the wave suppression effect when a plurality of wireless communication frequency bands work simultaneously.
Description
Technical Field
The application belongs to the technical field of communication, and particularly relates to an antenna structure and electronic equipment.
Background
With the rapid development of terminal technology, more and more wireless communication frequency bands are covered by the intelligent terminal, and when a plurality of wireless communication frequency bands are simultaneously used, harmonic waves of one frequency band interfere with another frequency band, especially second harmonic waves closest to a fundamental frequency, and the second harmonic waves can be effectively inhibited while the radio frequency performance of the fundamental frequency band is kept by using high-selectivity filtering.
In the related art, a notch structure constructed with an inductor and a capacitor is generally disposed on a radio frequency path, or a filter is mounted. The selectivity of the inductor in the patch filter is not high, the single-stage suppression of the second harmonic is not ideal, and the central value of the suppression frequency point is difficult to control due to poor consistency of device values of the inductor and the capacitor. When a multi-stage structure is arranged, the insertion loss of a fundamental frequency band is obviously large, and the suppression frequency points at all stages are inconsistent because of poor consistency of device values of an inductor and a capacitor, so that the suppression effect of harmonic waves cannot be obviously improved on the whole.
Therefore, the problem that the harmonic suppression effect is poor when a plurality of wireless communication frequency bands work simultaneously exists in the related technology.
Disclosure of Invention
An object of the embodiments of the present application is to provide an antenna structure and an electronic device, which can solve the problem of poor harmonic suppression effect when a plurality of wireless communication frequency bands work simultaneously.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides an antenna structure, including:
the antenna structure comprises an antenna body and a first antenna node, wherein a first distance between the first antenna node and the antenna feed point is matched with a first inhibition frequency band central frequency point of the antenna structure;
a first phase modulation arm, a first end of the first phase modulation arm connected to the first antenna node;
the adjustable variable capacitor is used for adjusting the first suppressed frequency band central frequency point to a first target suppressed frequency band central frequency point under the condition that a first preset electric signal is obtained, and the current phase of the first phase modulation arm is opposite to the current phase of the antenna body under the condition that the first phase modulation arm obtains the resonant frequency which accords with the first target suppressed frequency band central frequency point.
In a second aspect, an embodiment of the present application provides an electronic device, which includes the antenna structure of the first aspect.
In this application embodiment, can adjust the frequency band central point of suppressing of phase modulation arm through adjustable container and adjust, and can carry out the opposite phase through the phase modulation arm and restrain the resonant frequency that accords with above-mentioned frequency band central point, and like this, can realize changing the frequency band central point of suppressing of phase modulation arm through the capacitance value of adjusting the varactor, change the resonant frequency that phase modulation arm restraines promptly, can utilize adjustable container to adjust the performance of phase modulation arm, promote the uniformity of phase modulation arm, when a plurality of wireless communication frequency channels work simultaneously, can restrain the interference that the harmonic of a operating frequency produced another operating frequency.
Drawings
Fig. 1 is one of structural diagrams of an antenna structure provided in an embodiment of the present application;
fig. 2 is a second structural diagram of an antenna structure according to an embodiment of the present application;
fig. 3a is a current pattern of the antenna structure of fig. 2 in a first operating state;
fig. 3b is a current pattern of the antenna structure of fig. 2 in a second operating state;
fig. 4 is a third structural diagram of an antenna structure according to an embodiment of the present application;
fig. 5 is a fourth structural diagram of an antenna structure according to an embodiment of the present application;
fig. 6 is a fifth structural diagram of an antenna structure according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The antenna structure provided by the embodiments of the present application is described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
Please refer to fig. 1, which is a structural diagram of an antenna structure according to an embodiment of the present application. As shown in fig. 1, an antenna structure provided in an embodiment of the present application includes: antenna body 1, first phase modulation arm 2 and adjustable container 3.
The antenna body 1 comprises an antenna feed point 11 and a first antenna node 12, wherein a first distance between the first antenna node 12 and the antenna feed point 11 is matched with a first inhibition frequency band central frequency point of the antenna structure; a first end of the first phasing arm 2 is connected to a first antenna node 12; the tunable tank 3 is connected to the second end of the first phase tuning arm 2.
In operation, the adjustable container 3 is configured to adjust the first suppressed frequency band central frequency point to a first target suppressed frequency band central frequency point when acquiring a first preset electrical signal, and when the first phase modulation arm 2 acquires a resonant frequency that meets the first target suppressed frequency band central frequency point, a current phase of the first phase modulation arm 2 is opposite to a current phase of the antenna body 1.
In a specific implementation, the first phase modulation arm 2 acquires the resonant frequency conforming to the central frequency point of the first target rejection frequency band, which may be understood as that the first phase modulation arm 2 acquires the resonant frequency conforming to the central frequency point of the first target rejection frequency band from the first antenna node 12. The first phase modulation arm 2 may include a capacitor, an inductor, and other structures, and may adjust a current phase according to the obtained radiation waves of different frequencies, and when the first phase modulation arm 2 receives the suppressed harmonic, the current signal in the antenna body 1 is shunted, that is, the current phase in the first phase modulation arm 2 is opposite to the current phase of the antenna body 1, so as to reduce the radiation efficiency of the antenna body 1 to the suppressed harmonic; when the first phase modulation arm 2 receives non-suppressed harmonics (including fundamental frequency radiation waves with suppressed harmonics and other working radiation waves in frequency bands), the current signal in the antenna body 1 is not shunted, that is, the current phase in the first phase modulation arm 2 is the same as that of the antenna body 1, so that the radiation efficiency of the non-suppressed harmonics in the antenna body 1 is not disturbed. The first phase-modulating arm 2 may specifically comprise at least one of a capacitive element and an inductive element.
It should be noted that, in actual work, the capacitor, the inductor, and the like in the first phase modulation arm 2 may be affected by the value of the electrical signal to make the actual structural parameters different from the rated parameters, so that the first rejection frequency band center frequency point of the antenna structure deviates from the first target rejection frequency band center frequency point of the resonant frequency to be rejected.
In addition, the first preset electric signal may be a preset voltage signal, and in practice, when the variable capacitor 3 obtains different voltage values, the capacitance value thereof is changed. Specifically, the electronic device having the antenna structure provided in this embodiment of the present application has a processor, and the tunable capacitor 3 and the first radiation arm 2 may be connected to the processor, so that the processor obtains the phase of the first radiation arm 2, controls the electrical signal generation module to generate the first preset electrical signal according to a difference between the phase and a target phase, and transmits the first preset electrical signal to the tunable capacitor 3 to control the tunable capacitor 3 to adjust the phase of the first radiation arm 2 to be consistent with the target phase. Wherein, the target phase is determined according to the radiation wave propagating on the antenna body 1, that is, in the case that the radiation wave propagating on the antenna body 1 is a suppressed harmonic, the target phase of the first radiation arm 2 is opposite to the phase of the suppressed harmonic propagating on the antenna body 1; when the radiation wave propagating through the antenna body 1 is an unsuppressed harmonic, the target phase of the first radiation arm 2 is the same as the phase of the antenna body 1 propagating the unsuppressed harmonic.
In this embodiment, when the electrical property and the like of the first phase modulation arm 2 are changed to make a difference between the first suppressed frequency band center frequency point and the first target suppressed frequency band center frequency point, the adjustable container 3 can be supplied with a corresponding voltage to adjust the device values of the first phase modulation arm 2 to be consistent, so that the suppressed frequency band center frequency point is adjusted to the first target suppressed frequency band center frequency point, and the consistency of the first phase modulation arm 2 is improved.
For example: if the central frequency of the resonant frequency of the antenna structure, which needs to be suppressed, is 3.5GHz, the suppressed frequency central frequency point is 3.5GHz under the condition that the first phase modulation arm 2 flows through the first current value, and at this time, the first voltage value is sent to the adjustable container, so that the suppressed frequency central frequency point of the first phase modulation arm 2 is kept unchanged; when the second current value flows through the first phase modulation arm 2, the suppression frequency center frequency point is 3.6GHz, and at this time, the second voltage value is sent to the adjustable container, so that the suppression frequency center frequency point of the first phase modulation arm 2 is adjusted to 3.5GHz by the first phase modulation arm 2.
In a specific implementation, a first end of the antenna body 1, where the antenna feed point 11 is disposed, and a second end of the antenna body 1, which is far away from the antenna feed point 11, may be connected to a ground terminal, so that a current in the antenna body 1 may flow from the first end of the antenna body 1 to the second end of the antenna body 1. The second end of the tunable capacitor 3 is grounded, and the phase of the current of the first phase-adjusting arm 2 is opposite to the phase of the current of the antenna body 1, and may be: the current in the first phase modulation arm 2 flows from the first end of the first phase modulation arm 2 to the tunable capacitor 3. At this time, the current in the antenna body 1 flows into the first phase modulation arm 2 via the first antenna node 12, so that the current on the antenna body 1 decreases, and the resonant frequency on the antenna body 1 can be lowered.
In addition, the antenna body 1 may also be a loop antenna structure as shown in fig. 3a and 3b, and the current in the antenna body 1 may be in a counterclockwise direction. The current phase of the first phase-adjusting arm 2 is opposite to the current phase of the antenna body 1, and may be: the current in the first phasing arm 2 as shown in fig. 3a flows from the first end of the first phasing arm 2 to the second end of the first phasing arm 2. At this time, the current in the antenna body 1 flows into the first phase modulation arm 2 via the first antenna node 12, so that the current on the antenna body 1 decreases, and the resonant frequency on the antenna body 1 can be lowered.
It should be noted that, when the first phase modulation arm 2 acquires a resonant frequency that does not meet the center frequency point of the first target rejection frequency band, for example: when the operating frequency (or may be referred to as a fundamental frequency) is obtained, as shown in fig. 3b, the current phase of the first phase modulation arm 2 is the same as the current phase of the antenna body 1, specifically, when the antenna body 1 transmits the operating frequency of the electronic device, the operating frequency does not conform to the first target rejection frequency band central frequency point, and at this time, the current phase of the first phase modulation arm 2 is the same as the current phase of the antenna body 1, so that the operating frequency of the electronic device is not suppressed or interfered.
In this embodiment, when the fundamental frequency or the channel of the electronic device having the antenna body 1 is changed, the capacitance of the tunable capacitor 3 is adjusted, so that the device values of the first phase tuning arm 2 are kept consistent, the frequency band center frequency points suppressed by the first phase tuning arm 2 are kept consistent, and the harmonic suppression efficiency of the antenna structure is improved.
In addition, the first distance between the first antenna node 12 and the antenna feed point 11 is matched with the first suppressed frequency band center frequency point of the antenna structure, and it can be understood that: when the electrical length (which may also be referred to as an equivalent length) between the first antenna node 12 and the antenna feed point 11 is equal to the first distance, a center frequency point of a resonance frequency suppressed by the antenna structure provided in the embodiment of the present application is a first suppressed frequency band center frequency point. In practical applications, the first suppressed frequency band central frequency point may be a second harmonic (or even harmonic), a third harmonic (or odd harmonic) and the like of a certain operating frequency.
For example, if the suppression frequency of the loop antenna structure shown in fig. 2 is designed as the second harmonic, the electrical length of the first antenna node 12 of the first phase-modulating arm 2 connected to the loop antenna 1 from the antenna feed point 11 during the fundamental frequency operation is assumed to be a × λ, where λ is the wavelength of the fundamental frequency, and the electrical length of the first antenna node 12 of the first phase-modulating arm 2 connected to the loop antenna 1 from the antenna feed point 11 during the second harmonic operation is 2a × λ b2×λb2× lambda × lambda. assume the equivalent electrical length of the first phase-modulating arm 2 at fundamental frequency is b1× λ and an equivalent electrical length at the second harmonic b2× lambda, reasonably selecting a value and b1Value b and2the phase of the first antenna node 12 of the loop antenna 1 is not changed when the first phase modulation arm 2 is switched in, and the phase of the first phase modulation arm 2 is opposite to the phase of the first antenna node 12 of the loop antenna 1 when the second harmonic wave works, so that the suppression of the second harmonic wave is realized. In order to improve the suppression effect, the first phase modulation arm 2 should be arranged at the peak corresponding to the second harmonic, i.e. the central frequency point of the second harmonic, so that a is 1/8 or 3/8. B is caused to be1N, and b2M-4 × a, wherein N, M is an integer.
When the suppression frequency of the antenna structure is designed to be the second harmonic, the other even harmonics can be suppressed by the phase modulation arm, and the suppression frequency is not particularly limited herein.
Of course, the antenna structure may also suppress other harmonics, such as: if the suppression frequency of the antenna structure is designed as the third harmonicThen, in the fundamental frequency operation, the electrical length of the first antenna node 12 of the first phase-modulating arm 2 connected to the loop antenna 1 from the antenna feed point 11 is recorded as a × λ, in the third harmonic operation, the electrical length of the first antenna node 12 from the antenna feed point 11 is 3a × λ, and it is assumed that the equivalent electrical length of the first phase-modulating arm 2 at the fundamental frequency is b1× λ and an equivalent electrical length at the third harmonic b2× lambda.reasonably selecting a value and b1、b2The phase of the first antenna node 12 of the loop antenna 2 does not change when the first phase modulation arm 2 is connected in the fundamental frequency operation, and the phase of the first phase modulation arm 2 is opposite to the phase of the first antenna node 12 of the loop antenna 2 when the third harmonic operates, so that the suppression of the third harmonic can be realized. In order to improve the suppression effect, the first phase modulation arm 2 should be arranged at the peak corresponding to the third harmonic (i.e. the central frequency point of the third harmonic corresponds to the position on the annular antenna 1), so that a is 1/12, 1/4 or 5/12, and b is1N, and b2M-6 × a, wherein N, M is an integer.
In the case where the suppression frequency of the antenna structure is designed to be the third harmonic, the other odd harmonics can be suppressed by the phase modulation arm, and the suppression frequency is not particularly limited herein.
The following description will be made specifically by taking the design of the suppression frequency of the antenna structure as the second harmonic as an example: if a is 1/8, b1＝1，b21/2. Then at the first antenna node 12, at fundamental frequency, the phase of the deflection caused by the reflection of the first phasing arm 2 is:
the original phase at the first antenna node 12 is
The two are exactly in phase, and the phase is unchanged; at the second harmonic, the phase of the deflection caused by the reflection from the first phase-modulating arm 2 is:
the original phase at the first antenna node 12 of the patch antenna 2 is
The two are just in opposite phases, and the power is mutually counteracted, thereby achieving the effect of inhibiting the second harmonic.
As an alternative implementation, as shown in fig. 2, in a case that the antenna body 1 is a loop antenna, the antenna body 1 further includes a second antenna node 13, and a second distance between the second antenna node 13 and the antenna feed point 11 is equal to the first distance, and the antenna structure may further include:
a second phase modulation arm 4, a first end of the second phase modulation arm 4 is connected to the second antenna node 13, a second end of the second phase modulation arm 4 is connected to a second end of the adjustable container 3, and a first end of the adjustable container 3 is connected to a second end of the first phase modulation arm 2, wherein the first phase modulation arm 2 and the second phase modulation arm 4 are symmetrically distributed along a first symmetry line (as shown by a dashed line a in fig. 2), and the antenna feed point 11 and the adjustable container 3 are located on the first symmetry line a.
In this embodiment, the second phase modulation arm 4 and the first phase modulation arm 2 work together to suppress the resonant frequency of the loop antenna, which has the same beneficial effects as the antenna structure provided in the embodiment shown in fig. 1, and is not described herein again.
As an alternative implementation, as shown in fig. 2, the antenna structure further includes: a first switch 5 and a second switch 6.
Wherein, a first end of the first switch 5 is connected with the first antenna node 12, and a second end of the first switch 5 is connected with a first end of the first phase modulation arm 2; a first terminal of the second switch 6 is connected to the second antenna node 13 and a second terminal of the second switch 6 is connected to a first terminal of the second phasing arm 4.
In operation, when the frequency difference between the center frequency point of the first rejection band and the operating frequency band of the antenna structure is smaller than the preset frequency value, the first end of the first switch 5 is disconnected from the second end of the first switch 5, and the first end of the second switch 6 is disconnected from the second end of the second switch 6.
In practical application, passive loss exists in the antenna body 1, the first phase modulation arm 2 and the second phase modulation arm 4, so that quality factors (also called as Q values) of the antenna structure are low, a trapped wave frequency band formed by reverse currents on the first phase modulation arm 2 and the second phase modulation arm 4 is wide, when a central frequency band of a suppressed frequency band is close to a fundamental frequency band, the first phase modulation arm 2 and the second phase modulation arm 4 can suppress the fundamental frequency band, and radiation efficiency of the fundamental frequency band is reduced. In this embodiment, the first terminal and the second terminal of the first switch 5 and the first terminal and the second terminal of the second switch 6 may be turned off under the above conditions, so as to avoid suppression of the fundamental frequency band, thereby improving the radiation performance of the fundamental frequency band.
In a specific implementation, the preset frequency value may be determined according to the accuracy of the first phase modulation arm 2, the second phase modulation arm 4, and the tunable tank 3 and an application scenario of the antenna structure, so as to ensure that the antenna operates only when the first phase modulation arm 2, the second phase modulation arm 4, and the tunable tank 3 can effectively suppress the resonant frequency and simultaneously do not interfere with the fundamental frequency; otherwise, the first and second terminals of the first and second switches 5 and 6 are opened.
In this embodiment, when the difference between the resonant frequency and the fundamental frequency is small, the first end and the second end of the first switch 5 and the second switch 6 are disconnected, so that the first phase modulation arm 2, the second phase modulation arm 4 and the tunable capacitor 3 can be prevented from suppressing the fundamental frequency while suppressing the resonant frequency, and the antenna performance of the antenna structure provided by the embodiment of the present application is improved.
It should be noted that, in the case of the antenna with a non-loop structure as shown in fig. 1, the antenna structure may only have a first switch disposed between the first phasing arm 2 and the first antenna node 12, and, in the case that the frequency difference between the central frequency point of the first rejection band and the operating frequency band of the antenna structure is smaller than a preset frequency value, the first switch is turned off, so as to avoid the phasing arm from suppressing the operating frequency band.
As an optional implementation manner, as shown in fig. 4, the antenna body 1 further includes a third antenna node 14 and a fourth antenna node 15, a third distance between the third antenna node 14 and the antenna feed point 11 is matched with a second suppressed frequency band center frequency point of the antenna structure, and a fourth distance between the fourth antenna node 15 and the antenna feed point 11 is equal to the third distance;
the first switch 5 and the second switch 6 further comprise a third terminal, the third terminal of the first switch 5 is connected to a third antenna node 14, and the third terminal of the second switch 6 is connected to a fourth antenna node 15;
under the condition that the target inhibition frequency band central frequency point of the antenna structure is the first inhibition frequency band central frequency point, a first end of the first switch 5 is communicated with a second end of the first switch 5, and a first end of the second switch 6 is communicated with a second end of the second switch 6;
the antenna structure is characterized in that the target inhibition frequency band central frequency point of the antenna structure is the second inhibition frequency band central frequency point, a third end of the first switch 5 is communicated with a second end of the first switch 5, a third end of the second switch 6 is communicated with a second end of the second switch 6, the adjustable container 3 is used for adjusting the second inhibition frequency band central frequency point to be the second target preset inhibition frequency band central frequency point under the condition of receiving a second preset electric signal, and the current phase of the first phase modulation arm 2 is opposite to the current phase of the antenna body 1 under the condition that the first phase modulation arm 2 obtains the resonance frequency which accords with the second target inhibition frequency band central frequency point.
In a specific implementation, under the condition that the first end of the first switch 5 is communicated with the second end of the first switch 5, and the first end of the second switch 6 is communicated with the second end of the second switch 6, the first phase modulation arm 2, the second phase modulation arm 4 and the adjustable variable container 3 suppress the resonant frequency of the center frequency point of the first suppression frequency band; under the condition that the third end of the first switch 5 is communicated with the second end of the first switch 5 and the third end of the second switch 6 is communicated with the second end of the second switch 6, the first phase modulation arm 2, the second phase modulation arm 4 and the adjustable variable container 3 suppress the resonant frequency of the central frequency point of the second suppression frequency band.
Wherein, above-mentioned, the process that resonance frequency that first modulation phase arm 2, second modulation phase arm 4 and adjustable container 3 suppressed the second and suppress frequency channel central frequency point has the same keeping away from with the process that resonance frequency that first suppression frequency channel central frequency point was suppressed to above-mentioned first modulation phase arm 2, second modulation phase arm 4 and adjustable container 3, the difference lies in: the first frequency band center frequency point is different from the second suppressed frequency band center frequency point, so that a third distance between the third antenna node 14 and the fourth antenna node 15 and the antenna feed point 11 is different from a first distance between the first antenna node 12 and the second antenna node 13 and the antenna feed point 11.
In the present embodiment, the antenna structure can be switched between the operating states by the first switch 5 and the second switch 6, and the antenna structure can suppress different resonant frequencies in different operating states. For example: when the first fundamental frequency and the second fundamental frequency work simultaneously, if the second harmonic of the first fundamental frequency can interfere with the second fundamental frequency, the antenna structure can be adjusted to the first working state, so that the first phase modulation arm 2, the second phase modulation arm 4 and the adjustable container 3 in the first working state can suppress the second harmonic of the first fundamental frequency; in addition, when the first fundamental frequency and the third fundamental frequency operate simultaneously, if the third harmonic of the first fundamental frequency can interfere with the third fundamental frequency, the first phase modulation arm 2, the second phase modulation arm 4 and the tunable container 3 in the second operating state can suppress the third harmonic of the first fundamental frequency by adjusting the antenna structure to the second operating state.
It should be noted that, in the case of being applied to the antenna with the non-loop structure shown in fig. 1, the antenna body 1 further includes a third antenna node, and a third distance between the third antenna node and the antenna feed point 11 is matched with a second suppressed frequency band center frequency point of the antenna structure;
the first switch further comprises a third terminal, the third terminal of the first switch is connected with the third antenna node, and at the same time, the second terminal of the first switch is communicated with one of the first terminal and the third terminal of the first switch;
under the condition that the target inhibition frequency band central frequency point of the antenna structure is the first inhibition frequency band central frequency point, the first end of the first switch is communicated with the second end of the first switch;
when the target suppressed frequency band central frequency point of the antenna structure is the second suppressed frequency band central frequency point, a third end of the first switch is communicated with a second end of the first switch, the adjustable variable capacitor is used for adjusting the second suppressed frequency band central frequency point to be the second target preset suppressed frequency band central frequency point under the condition of receiving a second preset electric signal, and under the condition that the first phase modulation arm obtains the resonance frequency conforming to the second target suppressed frequency band central frequency point, the current phase of the first phase modulation arm is opposite to the current phase of the antenna body.
In this embodiment, the switching node of the first switch is added, so that when the first switch is in different switching states, the same antenna structure can suppress harmonics of different frequencies, and the application range of the antenna structure for suppressing frequencies is increased.
The third switch 5 and the fourth switch 6 may be single-pole double-throw switches, so that the same antenna structure has different working states, and the antenna structure in different working states can suppress harmonics of different frequencies.
As an alternative implementation, as shown in fig. 5 or fig. 6, the antenna structure further includes: a coupled resonator module (7 as shown in fig. 5 or 8 as shown in fig. 6) coupled to said first phasing arm 2 and said second phasing arm 4.
In a specific implementation, in the process that the coupled resonance module is coupled to the first phase modulation arm 2 and the second phase modulation arm 4, the device values of the first phase modulation arm 2 and the second phase modulation arm 4 can be adjusted, so that the phases of the first phase modulation arm 2 and the second phase modulation arm 4 are changed, and the Q values of the first phase modulation arm 2 and the second phase modulation arm 4 are increased.
In this embodiment, in the process of suppressing the reverse phase current of the harmonic by the first phase modulation arm 2 and the second phase modulation arm 4, the width of the notch frequency band formed by the reverse phase current is reduced by the coupling between the coupling resonance module and the first phase modulation arm 2 and the second phase modulation arm 4, so that the notch frequency band is prevented from overlapping with the fundamental frequency band with a small difference in frequency, the first phase modulation arm 2 and the second phase modulation arm 4 are prevented from suppressing the fundamental frequency band, the radiation performance of the fundamental frequency band can be improved, and the radio frequency system adjacent to the suppressed frequency band and the radio frequency system at the fundamental frequency can work normally at the same time.
As an alternative embodiment, as shown in fig. 5 or fig. 6, the coupling resonance module is disposed on the side of the first phase-adjusting arm 2 and the second phase-adjusting arm 3 away from the antenna feed point 11.
In this embodiment, the coupling of the coupling resonance module and the antenna body 1 close to the antenna feed point 11 can be avoided, so as to avoid interference on the radiation performance of the antenna body 1.
In one embodiment, as shown in fig. 5, the coupling resonance module is an yttrium iron garnet ferrite (YIG) resonance structure 7.
In the present embodiment, the YIG resonant structure 7 is a passive resonant structure that improves the Q value of the first phase modulation arm 2 and the second phase modulation arm 4 coupled thereto by utilizing the high Q value characteristic of YIG.
In another embodiment, as shown in fig. 6, the coupled resonant module includes an active negative resistance 8.
In this embodiment, the passive loss on the antenna body 1, the first phase modulation arm 2, and the second phase modulation arm 4 is compensated by the active negative resistance coupled to the first phase modulation arm 2 and the second phase modulation arm 4, so as to increase the Q values of the first phase modulation arm 2 and the second phase modulation arm 4.
Optionally, the active negative resistance 8 includes a negative feedback amplifier 81 and a coupled resonant stub 82, a first end of the coupled resonant stub 82 is connected to a first end of the negative feedback amplifier 81, and a second end of the coupled resonant stub 82 is connected to a second end of the negative feedback amplifier 82.
In this embodiment, a negative feedback amplifier 81 is provided to perform negative feedback according to the passive loss on the antenna body 1, the first phase modulation arm 2, and the second phase modulation arm 4, and the Q values of the first phase modulation arm 2 and the second phase modulation arm 4 are affected by the coupling resonance branch 82 coupled with the first phase modulation arm 2 and the second phase modulation arm 4, specifically, a negative feedback electrical signal generated by the negative feedback amplifier 81 is in positive correlation with the passive loss on the antenna body 1, the first phase modulation arm 2, and the second phase modulation arm 4, and under the coupling effect of the coupling resonance branch 82, the coupling capacitance value or the coupling inductance value acquired by the first phase modulation arm 2 and the second phase modulation arm 4 can compensate the passive loss on the antenna body 1, the first phase modulation arm 2, and the second phase modulation arm 4, so as to improve the Q values of the first phase modulation arm 2 and the second phase modulation arm 4.
The electronic device in the embodiment of the present application may be a mobile electronic device, and may also be a non-mobile electronic device. By way of example, the mobile electronic device may be a mobile phone, a tablet computer, a notebook computer, a palm top computer, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a Personal Digital Assistant (PDA), and the like, and the non-mobile electronic device may be a Personal Computer (PC), a Television (TV), a teller machine, a self-service machine, and the like, and the embodiments of the present application are not particularly limited.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An antenna structure, comprising:
the antenna structure comprises an antenna body and a first antenna node, wherein a first distance between the first antenna node and the antenna feed point is matched with a first inhibition frequency band central frequency point of the antenna structure;
a first phase modulation arm, a first end of the first phase modulation arm connected to the first antenna node;
the adjustable variable capacitor is used for adjusting the first suppressed frequency band central frequency point to a first target suppressed frequency band central frequency point under the condition that a first preset electric signal is obtained, and the current phase of the first phase modulation arm is opposite to the current phase of the antenna body under the condition that the first phase modulation arm obtains the resonant frequency which accords with the first target suppressed frequency band central frequency point.
2. The antenna structure of claim 1, wherein the antenna body is a loop antenna, the antenna body further comprising a second antenna node, a second distance between the second antenna node and the antenna feed being equal to the first distance, the antenna structure further comprising:
a second phase modulation arm, a first end of the second phase modulation arm being connected to the second antenna node, a second end of the second phase modulation arm being connected to a second end of the adjustable varactor, a first end of the adjustable varactor being connected to a second end of the first phase modulation arm, wherein the first phase modulation arm and the second phase modulation arm are symmetrically distributed along a first symmetry line, and the antenna feed point and the adjustable varactor are located on the first symmetry line.
3. The antenna structure according to claim 1, further comprising:
a first switch, a first end of the first switch being connected to the first antenna node, a second end of the first switch being connected to the first end of the first phase modulation arm;
and under the condition that the frequency difference between the central frequency point of the first inhibition frequency band and the working frequency band of the antenna structure is smaller than a preset frequency value, disconnecting the first end of the first switch from the second end of the first switch.
4. The antenna structure of claim 3, wherein the antenna body further comprises a third antenna node, and a third distance between the third antenna node and the antenna feed point is matched with a second suppressed frequency band center frequency point of the antenna structure;
the first switch further comprises a third terminal, the third terminal of the first switch is connected with the third antenna node, and at the same time, the second terminal of the first switch is communicated with one of the first terminal and the third terminal of the first switch;
under the condition that the target inhibition frequency band central frequency point of the antenna structure is the first inhibition frequency band central frequency point, the first end of the first switch is communicated with the second end of the first switch;
when the target suppressed frequency band central frequency point of the antenna structure is the second suppressed frequency band central frequency point, a third end of the first switch is communicated with a second end of the first switch, the adjustable variable capacitor is used for adjusting the second suppressed frequency band central frequency point to be the second target preset suppressed frequency band central frequency point under the condition of receiving a second preset electric signal, and under the condition that the first phase modulation arm obtains the resonance frequency conforming to the second target suppressed frequency band central frequency point, the current phase of the first phase modulation arm is opposite to the current phase of the antenna body.
5. The antenna structure according to claim 2, further comprising: a coupling resonance module coupled with the first phasing arm and the second phasing arm.
6. The antenna structure of claim 5, wherein the coupled resonant module is disposed on a side of the first phase-shifting arm and the second phase-shifting arm away from the antenna feed point.
7. The antenna structure according to claim 5 or 6, characterized in that the coupling resonance module comprises an yttrium iron garnet ferrite YIG resonance structure.
8. The antenna structure according to claim 5 or 6, characterized in that the coupled resonant module comprises an active negative resistance.
9. The antenna structure of claim 8, wherein the active negative resistance comprises a negative feedback amplifier and a coupled resonant stub, a first end of the coupled resonant stub being connected to a first end of the negative feedback amplifier, a second end of the coupled resonant stub being connected to a second end of the negative feedback amplifier.
10. An electronic device, characterized in that the electronic device comprises an antenna structure according to any of claims 1-9.
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| CN111613880B (en) | 2022-09-16 |
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