CN215816374U - Communication antenna device - Google Patents

Abstract

The utility model discloses a communication antenna device, belonging to the field of communication equipment, the device comprises: the antenna comprises a first communication module, an antenna module and an inductor; the first communication module includes: a first communication chip and a first matching circuit; the antenna module comprises at least one communication antenna for transmitting a second communication signal; wherein a frequency of the first communication signal is less than a frequency of the second communication signal; the communication antenna is connected in series with the first matching circuit through the inductor. The technical scheme provided by the utility model enables the first communication signal and the second communication signal to share the antenna module for transmission, and the first communication signal is not interfered by the second communication signal, thereby saving the circuit volume, simplifying the circuit, reducing the size of a terminal electronic product and improving the radiation efficiency of the antenna.

Description

Communication antenna device

Technical Field

The present invention relates to the field of communication devices, and in particular, to a communication antenna device.

Background

Along with the development of science and technology, the functions of terminal electronic products are more and more powerful, and many terminal electronic products integrate the near field communication technology, and bring convenience to people's life in the aspects of payment, traffic, authentication and the like. However, the increase of the near field communication function tends to introduce a corresponding near field communication module and a near field communication dedicated antenna, so that the volume of a circuit is increased, and finally the size of a terminal electronic product is increased. The skilled person finds that at least the following problems exist in terminal electronic products that typically include near field communication functionality: a near field communication circuit module and a near field communication special antenna are added, and the traditional near field communication special antenna is realized by adopting a mode of adding ferrite to a flexible printed circuit board, so that the occupied space is large, and the volume of a terminal electronic product is increased. Nowadays, terminal electronic equipment is developed in a light and handy manner, and the difficulty of integrating near field communication functions in a limited product size is increasing.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art, embodiments of the present invention provide a communication antenna apparatus, which enables a near field communication module and a signal communication module with a higher frequency to share a communication antenna for transmitting signals without interfering with each other, without introducing a near field communication dedicated antenna. The technical scheme is as follows:

there is provided a communication antenna device comprising:

the antenna comprises a first communication module, an antenna module and an inductor;

the first communication module includes: a first communication chip and a first matching circuit for processing a first communication signal;

the antenna module at least comprises a communication antenna, the communication antenna is used for transmitting a second communication signal, and the frequency of the first communication signal is smaller than that of the second communication signal;

the communication antenna is connected in series with the first matching circuit through the inductor, so that the antenna module can transmit the first communication signal, and the first communication signal and the second communication signal are not interfered with each other.

Further, the antenna module is connected in series with an inductor to ground or directly to ground.

Further, the antenna module comprises at least two communication antennas connected in series by an inductor.

Further, the antenna module comprises at least a first communication antenna and a second communication antenna;

the first communication antenna is connected with the first matching circuit in series through an inductor;

the second communication antenna is connected with the inductor in series and is grounded or is directly grounded.

Further, the communication antenna in the antenna module is grounded through a series capacitance.

Further, the first communication module further comprises a balun;

the balun is disposed between the first communication chip and the first matching circuit.

Further, the single-ended channel of the balun is electrically connected to the first matching circuit;

the ground channel of the balun is grounded.

Further, the first communication module further comprises a filter circuit for filtering high frequency harmonics;

the filter circuit is arranged between the first communication chip and the balance-unbalance converter;

the filter circuit is electrically connected with the signal output end of the first communication chip and is electrically connected with the double-end channel of the balance-unbalance converter.

Further, the apparatus also includes a second communication module for processing the second communication signal;

the communication antenna is connected with the second communication module in series through a capacitor.

Further, the second communication module includes a second communication chip and a second matching circuit;

the second communication chip is used for processing the second communication signal;

the second matching circuit is connected in series with a feed point of the communication antenna through a capacitor.

The technical scheme provided by the embodiment of the utility model has the following beneficial effects:

1. the first communication module and the antenna module are connected in series through the high inductance value and the low loss inductance, and the purpose that the antenna module replaces a special antenna of the first communication module to transmit the first communication signal is achieved.

2. The first communication module and the second communication module share the antenna, so that the problem of circuit volume increase caused by the introduction of a first communication special antenna consisting of a flexible PCB and ferrite is solved. The circuit volume is saved, and the physical appearance size of the terminal electronic product is reduced.

3. The isolation degree between signals is increased due to the high inductance value and the low loss inductance, and the problem of mutual interference between the first communication signal and the second communication signal during transmission is solved.

4. The series inductance increases the inductance of the antenna module and improves the radiation efficiency of the antenna.

5. Converting a first communication transmission signal of double-ended transmission into a single-ended transmission signal by using a balun; the first communication receiving signal transmitted by the single end is converted into the double-end transmission signal, so that the circuit structure is simplified, and a good signal transmission effect is obtained.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic diagram of a topology of a communication antenna apparatus according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a grounding structure of a communication antenna according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a topology structure in which more than two second communication antennas exist in a communication antenna apparatus according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.

It should be noted that the terms "first" and "second" in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Unless otherwise expressly specified or limited, such mechanical terms as "disposed" and the like are to be construed broadly, for example: either electrically or with the two modules in communication. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The existing near field communication function needs a special near field communication antenna to be matched with a near field communication module to transmit signals, so that the size of a circuit is not reduced, and the size of a terminal electronic product is not reduced. Therefore, the embodiment of the utility model discloses a communication antenna device, and the specific technical scheme is as follows.

There is provided a communication antenna device comprising: the antenna comprises a first communication module, an antenna module and an inductor; the first communication module includes: a first communication chip and a first matching circuit for processing a first communication signal; the antenna module at least comprises a communication antenna which is used for transmitting a second communication signal; the frequency of the first communication signal is less than the frequency of the second communication signal; the communication antenna is connected in series with the first matching circuit through the inductor, so that the antenna module can transmit the first communication signal, and the first communication signal and the second communication signal are not interfered with each other.

Wherein, the inductor usually has high inductance and low loss; the highest frequency of the frequency band of the first communication signal is less than the lowest frequency of the frequency band of the second communication signal; the first communication signal is a high-frequency signal with a frequency band of 3-30MHz, and the first communication signal is preferably a near field communication signal; the first communication chip is used for generating a first communication signal and processing the received first communication signal, but is not limited to generating and receiving the first communication signal; the second communication signal frequency is higher than the high frequency band, usually the ultrahigh frequency band with the frequency band at 300-; the antenna module at least comprises a communication antenna, wherein the frequency of signals transmitted by the antenna is higher than the high-frequency band, and the antenna is generally used for transmitting ultrahigh-frequency signals with the frequency band of 300-3000 MHz.

As one case, the antenna module is connected in series with an inductor to ground, or directly to ground; the inductor can be selected from high inductance value and low loss inductance.

The two grounding modes of the antenna module are for the last antenna in the antenna module.

As one case, the antenna module includes at least two communication antennas connected in series through an inductor; the inductor can be selected from high inductance value and low loss inductor, and the signal frequency transmitted by the two communication antennas connected in series at the two ends of the inductor is higher than the high frequency band, which is usually used for transmitting ultrahigh frequency signals with the frequency band of 300-3000 MHz.

As a case may be, the antenna module includes at least a first communication antenna and a second communication antenna; the first communication antenna is connected with the first matching circuit in series through an inductor; the second communication antenna is grounded through a series inductor or is directly grounded; the inductance has high inductance value and low loss; the grounding point is the grounding point corresponding to the first communication module.

As one case, the communication antenna in the antenna module is grounded through a series capacitance.

The capacitive grounding method is used for all antennas in the antenna module, and the capacitive grounding method is used for the last antenna in the antenna module, and the direct grounding method or the inductive grounding method is used.

As one case, the first communication module further includes a balun; the balun is disposed between the first communication chip and the first matching circuit.

As one case, the balun includes a single-ended channel, a ground channel, and a double-ended channel; the single-ended channel corresponds to the first port, the ground channel corresponds to the second port, and the double-ended channel corresponds to the third port and the fourth port respectively.

The first port of the balun is electrically connected with the first matching circuit; the second port of the balun is grounded.

As one case, the first communication module further includes a filter circuit for filtering high-frequency harmonics, the filter circuit being disposed between the first communication chip and the balun; the filter circuit is a low-pass filter circuit, and the filter circuit can select an LC low-pass filter; the filter circuit comprises a first port, a second port, a third port and a fourth port; the first port of the filter circuit is electrically connected with the third port of the balun; the second port of the filter circuit is electrically connected with the fourth port of the balun; and the third port of the filter circuit and the fourth port of the filter circuit are electrically connected with the signal output end of the first communication chip.

As one case, the apparatus further comprises a second communication module for processing the second communication signal; the second communication antenna is connected with the second communication module in series through a capacitor; the signal frequency processed by the second communication module is higher than the high frequency band, which is usually an ultrahigh frequency signal with a frequency band of 300-3000 MHz.

As a case may be, the second communication module includes a second communication chip and a second matching circuit; the second communication chip is used for processing the second communication signal; the second matching circuit is connected in series with a feed point of the second communication antenna through a capacitor.

All the above-mentioned alternative technical solutions can be combined arbitrarily to form alternative embodiments of the present invention, and the technical solutions provided by the present invention are specifically described in the following by two preferred combination manners.

Example one

As shown in fig. 1, a communication antenna apparatus includes: the antenna module comprises a first communication module 11, an antenna module 12, a second communication module 13, an inductor L110, an inductor L120 and a capacitor C121.

The first communication module 11 is connected in series with the antenna module 12 via an inductor L110, and the antenna module 12 (including an antenna) is connected in series with the second communication module 13 via a capacitor C121.

The first communication module 11 includes: a first communication chip 111, a first matching circuit 112; a balun 113; a filter circuit 114.

Preferably, the first communication module 11 may be a near field communication module of near field communication signals; the antenna module 12 may be an antenna module for transmitting a uhf signal; the first communication chip 111 may be a near field communication chip; the first matching circuit 112 may be a near field communication matching circuit; the filter circuit 114 may be a low pass filter circuit; the inductance L110 and the inductance L120 can be high inductance and low inductance; the capacitor C121 may be a high capacitance value, low loss capacitor.

The balun 113 includes: a first port 113-1, a second port 113-2, a third port 113-3, and a fourth port 113-4.

The filter circuit 114 includes: a first port 114-1, a second port 114-2, a third port 114-3, and a fourth port 114-4.

The signal output end of the first communication chip 111 is electrically connected to the third port 114-3 and the fourth port 114-4 of the filter circuit 114, the first port 114-1 of the filter circuit 114 is electrically connected to the third port 113-3 of the balun 113, the second port 114-2 of the filter circuit 114 is electrically connected to the fourth port 113-4 of the balun 113, the first port 113-1 of the balun 113 is electrically connected to the near-field communication matching circuit 112, the second port 113-2 is grounded, and the first matching circuit 112 is connected in series to the antenna module 12 through the high inductance value and the low loss inductance L110.

The second communication module 13 includes: a second signal module 131 and a second matching circuit 132.

Preferably, the second communication module 13 may be a very high frequency communication module; the second signal module 131 may be a uhf signal module; the second matching circuit 132 may be a uhf signal matching circuit.

The second signal module 131 is electrically connected to the second matching circuit 132, and the second matching circuit 132 is connected to a feeding point of the antenna module 12 in series through the capacitor C121.

In the present embodiment, the grounding structure of the antenna module 12 is as shown in fig. 2. As shown in fig. 2(1), if the antenna in the antenna module 12 is a monopole antenna, the antenna module 12 may be grounded in series through a high-inductance and low-loss inductance L120; as shown in fig. 2(2), if the antenna in the antenna module 12 is a non-monopole antenna, the antenna includes at least one grounding point, one of the grounding points is directly grounded, and the other grounding points may be grounded by series capacitors according to actual debugging requirements.

The frequency of the near field communication signal generated by the first communication chip 111 is 13.56MHz, the high frequency harmonic is filtered by the filter circuit 114 to obtain a clean near field communication signal, the near field transmission signal transmitted at the double ends is converted into a single-end transmission signal by the balance-unbalance converter 113 for transmission, and the near field communication signal is transmitted after being matched by the first matching circuit 112High inductance, low loss inductance L110. Since the near field communication signal is a high frequency signal, the signal frequency is 10¹The MHz level is very low compared with the ultrahigh frequency signals (signal frequency is in the level of 300-3000 MHz) of GPS, WIFI and the like. The high inductance and low loss inductance L110 corresponds to a path for a low frequency signal and an open circuit for a high frequency signal. Since the high-inductance and low-loss inductance L110 has a blocking effect on signals with high frequency, near-field communication signals with lower frequency can be conducted to the antenna module 12 through the high-inductance and low-loss inductance L110, and further transmitted to the space by the antenna module 12.

When the antenna module 12 receives a signal, the high-inductance, low-loss inductance L110 has a blocking lease for signals with high frequency, for example: ultrahigh frequency signals such as GPS, WIFI and the like are blocked by a high-inductance value and low-loss inductance L110; the near field communication signal with a lower frequency can be transmitted to the communication module 11 through the high inductance value and the low loss inductance L110, the balun 113 converts the near field receiving signal transmitted from the single terminal into the dual terminal transmitting signal for transmission, and finally the first communication chip 111 in the first communication module 11 processes the near field receiving signal. The antenna module is shared by the near field communication signal and the ultrahigh frequency signal, and the near field communication signal and other ultrahigh frequency signals are not interfered with each other.

Because the high inductance value and the low loss inductance L110 are connected in series in the loop of the antenna module 12, the inductance value of the communication antenna loop is increased, which is convenient for impedance matching, is beneficial to reducing the voltage standing wave ratio of the communication antenna, is beneficial to improving the radiation efficiency of the antenna module 12, and is beneficial to the radiation of signals to the space.

Example two

As shown in fig. 3, a communication antenna apparatus includes: the antenna module comprises a first communication module 11, an antenna module 12, a second communication module 13, an inductor L110, an inductor L120 and a capacitor C121.

The first communication module 11 is connected in series with the antenna module 12 through the inductor L110, and the antenna module 12 (including two or more antennas) is connected in series with the second communication module 13 through the capacitor C121.

The first communication module 11 includes: a first communication chip 111, a first matching circuit 112; a balun 113; a filter circuit 114.

Preferably, the first communication module 11 may be a near field communication module of near field communication signals; the antenna module 12 may be an antenna module for transmitting a uhf signal; the first communication chip 111 may be a near field communication chip; the first matching circuit 112 may be a near field communication matching circuit; the filter circuit 114 may be a low pass filter circuit; the inductance L110 and the inductance L120 can be high inductance and low inductance; the capacitor C121 may be a high capacitance value, low loss capacitor.

The balun 113 includes: a first port 113-1, a second port 113-2, a third port 113-3, and a fourth port 113-4.

The filter circuit 114 includes: a first port 114-1, a second port 114-2, a third port 114-3, and a fourth port 114-4.

The signal output end of the first communication chip 111 is electrically connected to the third port 114-3 and the fourth port 114-4 of the filter circuit 114, the first port 114-1 of the filter circuit 114 is electrically connected to the third port 113-3 of the balun 113, the second port 114-2 of the filter circuit 114 is electrically connected to the fourth port 113-4 of the balun 113, the first port 113-1 of the balun 113 is electrically connected to the near-field communication matching circuit 112, the second port 113-2 is grounded, and the first matching circuit 112 is connected in series to the antenna module 12 through the high inductance value and the low loss inductance L110. The communication antenna 121 is connected in series with the communication antenna 122 through the inductor L121, and the communication antenna 122 is connected in series with the inductor L122 and the subsequent communication antennas in sequence until the last communication antenna 12n is connected in series.

The communication antenna in the antenna module 12 is connected in series with the corresponding second signal module through a capacitor. For example: the communication antenna 121 is connected with the second communication module 131 through the capacitor C121; the communication antenna 122 is connected with the second communication module 132 through a capacitor C122; the communication antenna 12n is connected to the second communication module 13n through a capacitor C12 n.

The ground structure of any one of the communication antennas is shown in fig. 2. When actually grounding, attention needs to be paid to: as shown in fig. 2 (1): when the communication antenna 12n is connected in series with the inductor to ground, the corresponding grounding points of the other antennas in the antenna module 12, such as the communication antenna 121, the communication antennas 122, … …, of the communication antenna 12n are connected in series with the capacitor to ground; as shown in fig. 2(2), when there is a directly grounded communication antenna in the antenna module 12 besides the communication antenna 12n, the communication antenna 12n is no longer grounded through an inductor, and other communication antennas in the antenna module 12 except the directly grounded communication antenna may be grounded through a series capacitor or may be directly grounded, and the grounding mode may be selected according to an actual debugging situation.

The frequency of the near field communication signal generated by the first communication chip 111 is 13.56MHz, the high frequency harmonic is filtered by the filter circuit 114 to obtain a clean near field communication signal, the near field transmission signal transmitted at both ends is converted into a single-ended transmission signal by the balun 113 for transmission, and after matching by the first matching circuit 112, the near field communication signal is transmitted to the high-inductance and low-loss inductance L110. Since the near field communication signal is a high frequency signal, the signal frequency is 10¹The MHz level is very low compared with the ultrahigh frequency signals (signal frequency is in the level of 300-3000 MHz) of GPS, WIFI and the like. The high inductance and low loss inductance L110 corresponds to a path for a low frequency signal and an open circuit for a high frequency signal. Since the high-inductance and low-loss inductance L110 has a blocking effect on high-frequency signals, near-field communication signals with lower frequencies can be conducted to the communication antennas 121, 122, … …, 12n through the high-inductance and low-loss inductance L110, and further transmitted to the space through the serially connected communication antenna loops.

When the antenna module 12 receives a signal, the high-inductance, low-loss inductance L110 has a blocking lease for signals with high frequency, for example: ultrahigh frequency signals such as GPS, WIFI and the like are blocked by a high-inductance value and low-loss inductance L110; the near field communication signal with a lower frequency can be transmitted to the communication module 11 through the high inductance value and the low loss inductance L110, the balun 113 converts the near field receiving signal transmitted from the single terminal into the dual terminal transmitting signal for transmission, and finally the first communication chip 111 in the first communication module 11 processes the near field receiving signal. The antenna module is shared by the near field communication signal and the ultrahigh frequency signal, and the near field communication signal and other ultrahigh frequency signals are not interfered with each other.

Because the high inductance value and low loss inductance L110, the inductance 121, the inductance 122, and the inductance 12n are connected in series in the loop of the antenna module 12, the inductance value of the loop of the communication antenna is increased, which is convenient for impedance matching, which is beneficial to reducing the voltage standing wave ratio of the communication antenna, improving the radiation efficiency of the antenna module 12, and facilitating the radiation of signals to space.

While preferred embodiments of the present invention have been described, those skilled in the art, once apprised of the basic inventive concept, can make various other changes, variations and modifications to the embodiments without departing from the spirit and scope of the present invention. Thus, any alterations, modifications and variations of the present invention falling within the spirit and principle of the present invention shall fall within the scope of the claims of the present invention and the technical equivalents thereof. It is intended that the appended claims be interpreted as including preferred embodiments and all alterations, modifications, and variations that fall within the true spirit and scope of the embodiments of the present invention.

Claims (10)

1. A communication antenna apparatus, comprising: the antenna comprises a first communication module, an antenna module and an inductor;

the first communication module includes: a first communication chip and a first matching circuit for processing a first communication signal;

the antenna module at least comprises a communication antenna, the communication antenna is used for transmitting a second communication signal, and the frequency of the first communication signal is smaller than that of the second communication signal;

the communication antenna is connected in series with the first matching circuit through the inductor, so that the antenna module can transmit the first communication signal, and the first communication signal and the second communication signal are not interfered with each other.

2. A communication antenna arrangement according to claim 1, characterized in that the antenna module is connected in series with an inductance ground, or directly to ground.

3. A communication antenna arrangement according to claim 2, characterized in that the antenna module comprises at least two communication antennas connected in series by means of an inductance.

4. A communication antenna arrangement according to claim 3, wherein the antenna module comprises at least a first communication antenna and a second communication antenna;

the first communication antenna is connected with the first matching circuit in series through an inductor;

the second communication antenna is connected with the inductor in series and is grounded or is directly grounded.

5. A communication antenna arrangement according to any of claims 1-4, characterized in that the communication antenna in the antenna module is connected to ground via a series capacitor.

6. A communications antenna device according to any one of claims 1-4, characterized in that the first communications module further comprises a balun;

the balun is disposed between the first communication chip and the first matching circuit.

7. The antenna device of claim 6, wherein the single-ended channel of the balun is electrically connected to the first matching circuit;

the ground channel of the balun is grounded.

8. The communication antenna device according to claim 6, wherein the first communication module further comprises a filter circuit for filtering high frequency harmonics;

the filter circuit is arranged between the first communication chip and the balance-unbalance converter;

the filter circuit is electrically connected with the signal output end of the first communication chip and is electrically connected with the double-end channel of the balance-unbalance converter.

9. A communication antenna arrangement according to any of claims 1-4, characterized in that the arrangement further comprises a second communication module for processing the second communication signal;

the communication antenna is connected with the second communication module in series through a capacitor.

10. The communication antenna device according to claim 9, wherein the second communication module includes a second communication chip and a second matching circuit;

the second communication chip is used for processing the second communication signal;

the second matching circuit is connected in series with a feed point of the communication antenna through a capacitor.

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