CN219476982U - Phased array antenna for simultaneous same-frequency full duplex communication - Google Patents

Abstract

The utility model discloses a phased array antenna for simultaneous same-frequency full duplex communication, which relates to the technical field of phased array antennas. According to the phased array antenna for simultaneous same-frequency full duplex communication, provided by the utility model, the phase of the radio frequency signal and the phase of the low-frequency modulation signal are adjusted, so that the transmitting directional diagram and the receiving directional diagram of the phased array antenna in the space domain are non-reciprocal, and the transmitting directional diagram and the receiving directional diagram which are mutually independent can not interfere with each other, and therefore, the phased array antenna can realize simultaneous same-frequency full duplex communication.

Description

A Phased Array Antenna for Simultaneous and Same-Frequency Full-duplex Communication

technical field

The utility model relates to the technical field of phased array antennas, in particular to a phased array antenna for simultaneous and same-frequency full-duplex communication.

Background technique

At present, mobile communication systems usually adopt frequency division duplex or time division duplex technology to realize full-duplex communication. Frequency division duplex requires two independent channels, the uplink channel and downlink channel have different frequencies; time division duplex uplink channel and downlink channel work on different time slots. As one of the key candidate technologies for 6G, simultaneous co-frequency full-duplex communication is different from frequency-division duplex and time-division duplex. Realizing full-duplex communication can double the utilization rate of the spectrum. The utilization rate is measured by bits/second/Hz, and has a broad application prospect.

Traditionally, methods such as phase cancellation are used to realize simultaneous and same-frequency full-duplex communication, but the hardware is usually complicated. Therefore, it is very necessary to design a phased array antenna for simultaneous same-frequency full-duplex communication with a simple hardware structure.

Utility model content

The purpose of the utility model is to provide a phased array antenna for simultaneous and same-frequency full-duplex communication, which is used to realize simultaneous and same-frequency full-duplex communication on the basis of simple hardware structure.

In order to achieve the above object, the utility model provides the following scheme:

A phased array antenna for full-duplex communication at the same frequency at the same time, including: a radio frequency feed structure, a dielectric substrate and a modulation feed structure arranged in sequence from top to bottom; the modulation feed structure is also connected to the radio frequency feed Structural connection; the radio frequency feed structure is used to receive radio frequency signals; the modulation feed structure is used to receive low frequency modulation signals;

When the phased array antenna is in the transmitting mode, the phased array antenna converts the radio frequency signal of frequency f ₀ into frequency f ₀ + under the action of the low frequency modulation signal of frequency f _m The signal _of f _m is radiated out; when the phased array antenna is in the receiving mode, the frequency in the receiving space of the phased array antenna is f ₀ + The signal of f _m is converted into the radio frequency signal of frequency f ₀ .

Optionally, the radio frequency feed structure includes: two square radiation patches and a radio frequency feed network; the square radiation patches are provided with metallized via holes;

The two square radiating patches are respectively connected to the radio frequency feed network and the modulation feed structure through the metallized via holes; the diameter of the metallized via holes is smaller than the width of the radio frequency feed network.

Optionally, the cells on the radio frequency feeding network feed radio frequency signals.

Optionally, the modulation feed structure includes: an add modulation feed network, a drop modulation feed network, and a modulation circuit;

Both ends of the uplink modulation feed network and the downlink modulation feed network are connected to the modulation circuit; the ends of the modulation circuit are connected to the square radiation patch through the metallized via hole.

Optionally, the uplink modulation feed network feeds the uplink low-frequency modulation signal, and the downlink modulation feed network feeds the downlink low-frequency modulation signal; the uplink low-frequency modulation signal and the downlink low-frequency The phase difference of the modulated signal is 180°.

Optionally, the modulation circuit includes: an inductor, a capacitor and a varactor diode.

Optionally, when the stepping phase of the radio frequency signal is equal to 0 and the stepping phases of the uplink low-frequency modulation signal and the downlink low-frequency modulation signal are not equal to 0, the transmission pattern of the phased array antenna and The receive pattern is non-reciprocal and symmetric.

Optionally, when the step phase of the radio frequency signal is not equal to 0 and the step phases of the uplink low-frequency modulation signal and the downlink low-frequency modulation signal are not equal to 0, the transmission pattern of the phased array antenna and receive pattern are non-reciprocal and asymmetric.

According to the specific embodiment provided by the utility model, the utility model discloses the following technical effects:

The utility model provides a phased array antenna for full-duplex communication at the same frequency at the same time, which is provided with a radio frequency feed structure, a dielectric substrate and a modulation feed structure in sequence from top to bottom, and the modulation feed structure is also connected to the radio frequency feed structure , the RF feed structure is used to receive RF signals, and the modulated feed structure is used to receive low-frequency modulation signals; by adjusting the phase of the RF signal and the phase of the low-frequency modulation signal, the emission pattern and the spatial domain of the phased array antenna can be realized The receive pattern is non-reciprocal. The independent transmit pattern and receive pattern make the transmit signal and receive signal not interfere with each other, so the phased array antenna can realize full-duplex communication at the same time and frequency.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only the present invention. For some embodiments of the present invention, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts.

Fig. 1 is the structural representation of the radio frequency feeding structure that the utility model provides;

Fig. 2 is a structural schematic diagram of the modulation feed structure provided by the utility model;

Fig. 3 is the circuit diagram of the modulation circuit that the utility model provides;

Fig. 4 is the non-reciprocal and symmetrical emission pattern and reception pattern provided by the utility model; wherein, Fig. 4 (a) is the emission pattern, and Fig. 4 (b) is the reception pattern;

Fig. 5 is a non-reciprocal and asymmetric emission pattern and a reception pattern provided by the present invention; wherein, Fig. 5(a) is a emission pattern, and Fig. 5(b) is a reception pattern.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

The purpose of the utility model is to provide a phased array antenna for simultaneous and same-frequency full-duplex communication, which is used to realize the non-reciprocity of the transmission pattern and the reception pattern of the phased array antenna in the space domain.

In order to make the above purpose, features and advantages of the utility model more obvious and understandable, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The phased array antenna for simultaneous and same-frequency full-duplex communication provided by the utility model includes: a radiation feed structure, a dielectric substrate and a modulation feed structure arranged in sequence from top to bottom.

The modulated feed structure is connected to the radio frequency feed structure. The radio frequency feed structure is used to receive radio frequency signals; the modulation feed structure is used to receive low frequency modulation signals. When the phased array antenna is in the transmitting mode, the antenna converts the radio frequency signal of frequency _f0 into a signal of frequency _f0 + _fm under the action of the low-frequency modulation signal of _frequency fm and radiates it; when When the phased array antenna is in the receiving mode, the antenna receives a signal with a frequency of f ₀ +f _m in space under the action of a low-frequency modulation signal with a frequency of f _m and converts it into a radio frequency signal with a frequency of f ₀ .

As shown in FIG. 1 , the radio frequency feed structure includes: two square radiation patches 1 and a radio frequency feed network 2 . Metallized via holes 3 are provided on the square radiation patch 1 . The mesh 5 on the radio frequency feed network 2 feeds radio frequency signals. The two square radiating patches 1 are respectively connected to the radio frequency feed network 2 and the modulation feed structure through metallized via holes 3 ; the diameter of the metallized via holes 3 is smaller than the width of the radio frequency feed network 2 .

The size of the square radiation patch 1 is 1/2 times the wavelength of the medium, and the distance 1 between two square radiation patches is 1/2 times the wavelength of the free space. The expression of the medium wavelength is The expression for the free-space wavelength is Among them, c is the speed of light in vacuum, ε _r is the dielectric constant of the dielectric substrate, f ₀ is the frequency of the radio frequency signal, and f _m is the frequency of the low frequency modulation signal.

As shown in FIG. 2 , the modulation feed structure includes: an add modulation feed network 6 , a drop modulation feed network 7 and a modulation circuit 4 . Both ends of the up-channel modulation feed network 6 and the down-channel modulation feed network 7 are connected to the modulation circuit 4; Both the up-channel modulation feed network 6 and the down-channel modulation feed network 7 are coplanar waveguide feed networks. The uplink modulation feed network 6 feeds the uplink low-frequency modulation signal, and the downlink modulation feed network 7 feeds the downlink low-frequency modulation signal; the phase difference between the uplink low-frequency modulation signal and the downlink low-frequency modulation signal is 180°.

Further, as shown in FIG. 3 , the modulation circuit 4 includes: an inductor, a capacitor and a varactor diode.

The phased array antenna provided by the utility model can be arranged to form a phased array antenna array with any diameter and unit number. Arbitrary aperture refers to the array aperture size formed by the number of phased array antennas in the horizontal and vertical directions and the spacing of the phased array antennas.

In the transmitting mode of the phased array antenna array, the expression of the transmitting pattern is:

Wherein, k is the number of rows of the phased array antenna array; k=1,...,K; K is the total number of rows of the phased array antenna array; l is the number of columns of the phased array antenna array; l=1,. .., L; L is the total column number of the phased array antenna array; d _x is the longitudinal spacing of each phased array antenna, d _y is the horizontal spacing of each phased array antenna, is the phase of the RF signal, /> is the phase of the low-frequency modulation signal, θ is the pitch angle, /> is the horizontal plane angle, and k ₀ is the free-space wave number.

In the receiving mode of the phased array antenna array, the expression of the receiving pattern is:

Wherein, k is the number of rows of the phased array antenna array; k=1,...,K; K is the total number of rows of the phased array antenna array; l is the number of columns of the phased array antenna array; l=1,. .., L; L is the total column number of the phased array antenna array; d _x is the longitudinal spacing of each phased array antenna, d _y is the horizontal spacing of each phased array antenna, is the phase of the RF signal, /> is the phase of the low-frequency modulation signal, θ is the pitch angle, /> is the horizontal plane angle, and k ₀ is the free-space wave number.

When the step phase of the RF signal is equal to 0 and the step phases of the uplink low-frequency modulation signal and the downlink low-frequency modulation signal are not equal to 0, the transmit pattern and receive pattern of the phased array antenna are non-reciprocal and symmetric. When the step phase of the RF signal is not equal to 0 and the step phases of the uplink low-frequency modulation signal and the downlink low-frequency modulation signal are not equal to 0, the transmit pattern and receive pattern of the phased array antenna are non-reciprocal and asymmetric of.

As a specific embodiment, the phased array antenna array has one row and four columns. The material used for the dielectric substrate is Wangling WL-CT338, the dielectric constant is 3.38, the loss tangent is 0.0029, and the thickness is 0.305 mm. The frequency of the radio frequency signal is designed to be 3.2 GHz, the side length of the square radiation patch is 24 mm, and the distance between two square radiation patches is 43 mm. The model of the varactor diode in the modulation circuit is Skyworks SMV1231, the inductance is a 20nH chip inductor, and the capacitor is a 5pF chip capacitor.

In the test, the DC bias voltage loaded by the modulation circuit is 1V, the frequency of the low-frequency modulation signal is 300MHz, and the modulation factor is 0.4, that is, the amplitude of the low-frequency modulation signal is 0.4V. Control the step phase of the RF signal to 0°, and control the step phase of the low-frequency modulation signal to 60°. As shown in Figure 4, the beam pointing of the transmitting pattern of the phased array antenna is -19°, and the beam pointing of the receiving pattern The pointing is 19°, at this time, the transmitting pattern and receiving pattern of the phased array antenna are non-reciprocal and symmetrical.

Control the step phase of the RF signal to 31°, and control the step phase of the low-frequency modulation signal to 60°. As shown in Figure 5, the beam pointing of the transmitting pattern of the phased array antenna is -30°, and the beam pointing of the receiving pattern The pointing is 9°, at this time, the transmitting pattern and receiving pattern of the phased array antenna are non-reciprocal and asymmetric.

The utility model provides a phased array antenna for full-duplex communication at the same frequency at the same time, which is provided with a radio frequency feed structure, a dielectric substrate and a modulation feed structure in sequence from top to bottom, and the modulation feed structure is also connected to the radio frequency feed structure , the RF feed structure is used to receive RF signals, and the modulated feed structure is used to receive low-frequency modulation signals; by adjusting the phase of the RF signal and the phase of the low-frequency modulation signal, the emission pattern and the spatial domain of the phased array antenna can be realized The receive pattern is non-reciprocal. The independent transmit pattern and receive pattern make the transmit signal and receive signal not interfere with each other, so the phased array antenna can realize full-duplex communication at the same time and frequency.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

In this paper, specific examples have been used to illustrate the principle and implementation of the present utility model. The description of the above embodiments is only used to help understand the device of the present utility model and its core idea; meanwhile, for those of ordinary skill in the art, according to Thoughts of the present utility model all have changes in specific implementation and scope of application. To sum up, the contents of this specification should not be understood as limiting the utility model.

Claims (8)

1. A phased array antenna for simultaneous co-frequency full duplex communication, comprising: the device comprises a radio frequency feed structure, a dielectric substrate and a modulation feed structure which are sequentially arranged from top to bottom; the modulation feed structure is also connected with the radio frequency feed structure; the radio frequency feed structure is used for receiving radio frequency signals; the modulation feed structure is used for receiving a low-frequency modulation signal;

when the phased array antenna is in a transmitting mode, the phased array antenna is in a frequency f _m Under the action of said low-frequency modulation signal of f ₀ Is converted into a frequency f ₀ +f _m And radiate out the signal of (2); when the phased array antenna is in the receiving mode, the phased array antenna is in the frequency f _m Is f in the receiving space under the action of the low-frequency modulation signal ₀ +f _m Is converted into a signal of frequency f ₀ Is provided with a radio frequency signal.

2. The phased array antenna for simultaneous co-frequency full duplex communications according to claim 1, wherein the radio frequency feed structure comprises: two square radiating patches and a radio frequency feed network; the square radiation patch is provided with a metallized via hole;

the two square radiation patches are respectively connected with the radio frequency feed network and the modulation feed structure through the metallized via holes; the diameter of the metallized via is smaller than the width of the radio frequency feed network.

3. The phased array antenna for simultaneous co-frequency full duplex communications according to claim 2, wherein cells on the radio frequency feed network feed radio frequency signals.

4. The phased array antenna for simultaneous co-frequency full duplex communications according to claim 2, wherein the modulated feed structure comprises: an uplink modulation feed network, a downlink modulation feed network and a modulation circuit;

the tail ends of the uplink modulation feed network and the downlink modulation feed network are connected with the modulation circuit; the tail end of the modulation circuit is connected with the square radiation patch through the metallized via hole.

5. The phased array antenna for simultaneous co-frequency full duplex communications according to claim 4, wherein said upper modulation feed network feeds an upper low frequency modulation signal and said lower modulation feed network feeds a lower low frequency modulation signal; the phase difference between the upper low frequency modulation signal and the lower low frequency modulation signal is 180 degrees.

6. The phased array antenna for simultaneous co-frequency full duplex communication according to claim 4, wherein the modulation circuit comprises: inductance, capacitance, and varactors.

7. The phased array antenna for simultaneous co-frequency full duplex communications according to claim 5, wherein the transmit pattern and the receive pattern of the phased array antenna are non-reciprocal and symmetrical when the stepped phase of the radio frequency signal is equal to 0 and the stepped phases of the upper low frequency modulated signal and the lower low frequency modulated signal are not equal to 0.

8. The phased array antenna for simultaneous co-frequency full duplex communications according to claim 5, wherein the transmit pattern and the receive pattern of the phased array antenna are non-reciprocal and asymmetric when the stepped phase of the radio frequency signal is not equal to 0 and the stepped phases of the upper low frequency modulated signal and the lower low frequency modulated signal are not equal to 0.