CN207967321U - The interior full-duplex antenna of band of ring is mixed based on 180 degree - Google Patents

Abstract

The utility model discloses an in-band full-duplex antenna based on a 180-degree hybrid ring. The antenna includes a square microstrip radiation patch, two T-type probes for coupling and feeding, and a 180-degree hybrid ring feed network. The utility model designs an antenna with an in-band full-duplex function, and the transmitting and receiving processes of the antenna are carried out simultaneously and occupy the same working frequency band. The two isolated ports of the 180-degree hybrid ring are used as the transmitting end and the receiving end of the antenna, and the other two ports are led out by two 50Ω microstrip lines, and are coupled and fed to the radiation patch by two T-type probes. The transmission and reception of the antenna use orthogonal linearly polarized electromagnetic waves to provide polarization isolation. At the same time, the inherent two-port isolation provided by the 180-degree hybrid ring further realizes the high isolation between the transmission and reception ports.

Description

In-band full-duplex antenna based on 180-degree hybrid loop

technical field

The utility model relates to the technical field of wireless communication, in particular to an in-band full-duplex antenna based on a 180-degree hybrid ring.

Background technique

The antenna is a conversion device that radiates and receives electromagnetic waves. It can be used as a transmitting device to convert high-frequency current into radio waves of the same frequency and transmit it, or as a receiving device to receive and convert radio waves into high-frequency currents of the same frequency. It is widely used in mobile communication, broadcasting, radio, remote sensing, etc. For mobile communication systems, the antenna is more of a converter between equipment circuit signals and electromagnetic wave signals, and is the entrance and exit of information, and its performance affects the performance of the entire mobile network.

With the development of wireless communication, people's requirements for the rate of wireless communication are getting higher and higher, and the demand for capacity of wireless communication is also increasing. A single antenna can realize simultaneous transmission and reception and occupy the same working frequency band, which can effectively reduce the number of antennas and occupy space, and has very broad application space and practical value.

The main form of achieving in-band duplexing is to use dual-polarized antennas. Because the two ports of the dual-polarized antenna transmit or receive electromagnetic waves in two mutually perpendicular polarization directions, they do not affect each other. Therefore, the signal-to-noise ratio of the received signal of wireless communication can be improved through space diversity, thereby increasing the capacity of wireless communication. . Since the two ports of the dual-polarized antenna can work at the same operating frequency, and can distinguish two electromagnetic waves whose polarization directions are perpendicular to each other, the dual-polarized antenna is used as a full-duplex antenna relative to the traditional frequency-division duplex antenna. Transmitting and receiving can use the same working frequency, so the communication capacity of the communication system can be doubled.

In the past, the two ports of the in-band duplex antenna were fed separately by probes to generate orthogonal linearly polarized wave structures, which had the disadvantages of low port isolation, poor cross-polarization, and low antenna gain.

Utility model content

The purpose of this utility model is to provide an in-band full-duplex antenna based on a 180-degree hybrid loop in order to solve the above-mentioned defects in the prior art.

The purpose of this utility model can be achieved by taking the following technical solutions:

An in-band full-duplex antenna based on a 180-degree hybrid loop, the in-band full-duplex antenna includes an upper dielectric substrate, a lower dielectric substrate and two T-shaped probes for coupling and feeding, wherein two T The type probe is composed of the first horizontal arm 2 and the first vertical arm 4, and the second horizontal arm 3 and the second vertical arm 5 are vertically connected,

The upper surface of the upper dielectric substrate is printed with a square microstrip radiation patch 1, and the lower surface of the lower dielectric substrate is printed with the first horizontal arm 2 and the second horizontal arm 3 ,

A reflective floor 11 is printed on the upper surface of the lower dielectric substrate, and a 180-degree hybrid loop feed network is printed on the lower surface of the lower dielectric substrate. The 180-degree hybrid loop feed network includes three sections and four sections. The first microstrip line 14, the second microstrip line 15 and the third microstrip line 16 of one-quarter wavelength and the fourth microstrip line 17 of a section of three-quarter wavelength, the 180-degree hybrid ring feed network Including four ports, wherein, two ports are drawn out from the first impedance transformation line 8, the second impedance transformation line 9 and the fifth microstrip line 10 as isolated ports, and are used as the transmitting end and the receiving end respectively; the other two The first port is led out through the sixth microstrip line 6 and the seventh microstrip line 7 respectively, and is connected with the first vertical arm 4 and the second vertical arm 5 of the two T-shaped probes.

Further, the sixth microstrip line 6 and the seventh microstrip line 7 respectively connect with the first through hole 18 and the second through hole 19 on the reflective floor 11 and the lower dielectric substrate 13. The first vertical arm 4 and the second vertical arm 5 of the T-shaped probe are connected.

Further, the first horizontal arm 2 and the second horizontal arm 3 are rectangular microstrips, and are placed symmetrically along the diagonals of the square microstrip radiation patches, perpendicular to each other.

Further, the first vertical arm 4 and the second vertical arm 5 are metal probes, and are located at the symmetrical positions on both sides of the geometric center of the square microstrip radiation patch, while one end of the two metal probes They are respectively connected to the sixth microstrip line and the seventh microstrip line, and the other ends are respectively connected to the two horizontal arms of the two T-shaped probes through the reflection floor and through holes on the lower dielectric substrate.

Further, the signals reach the two T-type probes respectively through the ports of the transmitting end, and the signals arriving at the two T-type probes are equal in amplitude and 180 degrees out of phase, and then pass through the first two horizontal directions of the two T-type probes. The horizontal arm 2 and the second horizontal arm 3 are coupled to the square microstrip radiation patch to radiate out, and generate a linearly polarized wave in the y direction at the far field of the antenna.

Further, the signal reaches the two T-type probes respectively through the port of the receiving end, and the signal amplitude and phase of the signals reaching the two T-type probes are equal, and then passes through the first horizontal arms of the two horizontal directions of the two T-type probes 2 and the second horizontal arm 3 are coupled to the square microstrip radiation patch to radiate out, and generate a linearly polarized wave in the x direction at the far field of the antenna.

Furthermore, when the port at the transmitting end is excited, the antenna generates a linearly polarized wave in the y direction, and the signal will not flow out from the port at the receiving end.

Furthermore, when the port at the receiving end is excited, the antenna generates a linearly polarized wave in the x direction, and the signal will not flow out from the port at the transmitting end.

Further, the two isolated ports of the 180-degree hybrid loop feed network are used as the transmitting and receiving ends of the antenna respectively, and the transmitting and receiving ends of the antenna are excited to generate orthogonal linearly polarized waves. This structure makes the antenna transmit The receiving work is carried out at the same time, and the isolation between the transmitting end and the receiving end is greatly improved.

Compared with the prior art, the utility model has the following advantages and effects:

1. The utility model uses the 180-degree hybrid ring as the feeding network of the antenna, and uses the two isolated ports of the 180-degree hybrid ring as the transmitting and receiving ends of the antenna, so that the antenna transmits and receives simultaneously without interference.

2. The utility model uses the other two ports of the 180-degree hybrid ring as the feeding end of the antenna, and uses two feeding probes to couple to the square patch through the horizontal arms of the two T-type probes to radiate the signal. When the terminal is excited, a linearly polarized wave in the y direction is generated at the far field of the antenna, and when the receiving end is excited, a linearly polarized wave in the x direction is generated at the far field of the antenna, thereby further improving the isolation between the transmitting end and the receiving end.

3. When the utility model is excited at the transmitting end, the amplitude of the signal reaching the two T-type probes is equal and the phase difference is 180 degrees, and the generated cross-polarized components cancel each other out. Therefore, when the antenna is excited at the transmitting port, the radiation pattern on its radiation pattern The cross-polarization component is improved compared to the traditional two-probe-fed in-band duplex antenna.

Description of drawings

Fig. 1 is the general schematic diagram of the present embodiment and the numbering label of main components;

Fig. 2 is the overall schematic diagram of the present embodiment and the numbering labeling of refinement;

Fig. 3 is the front sectional view of the antenna of this embodiment;

FIG. 4 is a top view of the upper dielectric substrate of this embodiment;

FIG. 5 is a bottom view of the upper dielectric substrate of this embodiment;

FIG. 6 is a top view of the lower dielectric substrate in this embodiment;

FIG. 7 is a bottom view of the lower dielectric substrate of this embodiment;

FIG. 8 is a dimensional drawing of the upper surface structure of the upper dielectric substrate in this embodiment;

FIG. 9 is a dimensional drawing of the lower surface structure of the upper dielectric substrate in this embodiment;

FIG. 10 is a drawing of dimensions on the upper surface of the lower dielectric substrate in this embodiment;

FIG. 11 is a dimensional drawing of the lower surface structure of the lower dielectric substrate in this embodiment;

Fig. 12 (a) is the 2.4GHz simulated surface current distribution diagram of the in-band full-duplex antenna excited by port 1 of the present embodiment;

Fig. 12 (b) is the 2.4GHz simulated surface current distribution diagram of the in-band full-duplex antenna excited by port 2 of the present embodiment;

Fig. 13 is the test S parameter curve diagram of the antenna of the present embodiment;

Fig. 14 (a) is the test pattern of the xoz plane excited by the antenna port 1 (2.4GHz) of the present embodiment;

Fig. 14 (b) is the yoz plane test pattern of the excitation of the antenna port 1 (2.4GHz) of the present embodiment;

Fig. 15 (a) is the xoz surface test pattern of the excitation of the antenna port 2 (2.4GHz) of the present embodiment;

Fig. 15(b) is a yoz plane test pattern of the excitation of the antenna port 2 (2.4 GHz) in this embodiment.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the utility model more clear, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described The embodiments are some embodiments of the present utility model, but not all embodiments. 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.

Example

Referring to Fig. 1, Fig. 2 and Fig. 3, the present embodiment is based on the in-band full-duplex antenna of the 180-degree hybrid loop, including a square microstrip radiation patch 1, two T-shaped probes for coupling and feeding, The two T-shaped probes are respectively composed of the first horizontal arm 2, the first vertical arm 4, the second horizontal arm 3 and the second vertical arm 5, and a 180-degree hybrid loop feed network, the 180-degree hybrid loop The feed network includes three sections of the first microstrip line 14, the second microstrip line 15, the third microstrip line 16 and a section of the fourth microstrip line 17 of three-quarter wavelength. The square microstrip radiation patch 1 is printed on the upper surface of the upper dielectric substrate 12, and the first horizontal arm 2 and the second horizontal arm 3 of the two T-shaped probes for coupling and feeding are printed on the back side of the upper dielectric substrate 12, The 180-degree hybrid loop feed network is printed on the back of the lower dielectric substrate 13, and the two isolated ports of the 180-degree hybrid loop feed network are composed of the first impedance transformation line 8, the second impedance transformation line 9 and the fifth microstrip line of 50Ω 10 lead out, respectively used as the transmitting end (port 1) and the receiving end (port 2), and its other two ports are drawn out through the sixth microstrip line 6 and the seventh microstrip line 7 of 50Ω respectively, and respectively pass through The first vertical arm 4 and the second vertical arm 5 of the two T-shaped probes of the first through hole 18 and the second through hole 19 on the reflective floor 11 and the lower dielectric substrate 13 are connected, and the first vertical arm 4 and the second vertical arm 5 are connected. The vertical arm 5 is connected to the first horizontal arm 2 and the second horizontal arm 3 respectively.

When sending, the sending signal is sent from the transmitting end (port 1), and the fifth microstrip line 10 of 50Ω reaches the two ports of the 180-degree hybrid ring feed network respectively at the same time, and the two ports are respectively connected by the sixth microstrip line of 50Ω. The strip line 6 and the seventh microstrip line 7 are drawn out, and then the signals are transmitted to the two horizontal first vertical arms of the two T-shaped probes by the two vertical first vertical arms 4 and the second vertical arms 5 of the two T-shaped probes respectively. A horizontal arm 2 and a second horizontal arm 3, finally the first horizontal arm 2 and the second horizontal arm 3 simultaneously couple signals to the square patch and radiate out. Since the amplitudes of the signals reaching the first horizontal arm 2 and the second horizontal arm 3 of the two levels are equal and the phases are 180 degrees different, a linearly polarized wave in the y direction can be generated at the far field of the antenna.

When receiving linearly polarized waves in the x direction, the received signal is received from the square radiation patch 1, and the square radiation patch 1 simultaneously couples the received signal to the first horizontal arm 2 and the second horizontal arm of the two T-shaped probes Arm 3, the first horizontal arm 2 and the second horizontal arm 3 transmit the signal to the two vertical first vertical arms 4 and the second vertical arm 5 of the two T-type probes respectively, the first vertical arm 4 and the second vertical arm The arm 5 then transmits the signal to the two ports of the 180-degree hybrid ring feed network respectively drawn out by the sixth microstrip line 6 and the seventh microstrip line 7 of 50Ω, and finally the sixth microstrip line 6 and the seventh microstrip line The signal transmitted by the strip line 7 reaches the first impedance transformation line 8 at the same time, and the second impedance transformation line 9 is output from the receiving end (port 2).

Figures 4, 5, 6, and 7 are the electrical structure diagrams of the upper and lower surfaces of the two dielectric substrates respectively. The stripe filling part is the structure covered by conductor copper, and the rest is the dielectric substrate.

Figures 8, 9, 10, and 11 are dimensioned diagrams of the electrical structure of each part.

8, FIG. 9, FIG. 10, and the dimensions of FIG. 11, the specific parameters of the antenna in this embodiment are as follows: the materials and dimensions of the two dielectric plates are the same, the thickness c is 0.8mm, the width b is 100mm, and the length a is 100mm. The height h between the two dielectric plates is 6mm. The side length 1a of the square patch and the distance 1b from the edge of the dielectric board are 44mm and 28mm, respectively. The length and width 2a, 2b of the first horizontal arm 2 of a T-shaped probe are 5.6mm, 2mm respectively, and the length and width 3a, 3b of the second horizontal arm 3 of another T-shaped probe are 5.6mm, 2mm respectively , the distance between the center of the two through holes on the reflective floor and the edge of the dielectric plate is 12.5mm, 18a, 19a, and the main dimensions 6a, 6b, 6c of the 180-degree hybrid ring feed network are 6.78mm, 5.42mm, 2.25mm, 7a, 7b respectively , 7c are 6.78mm, 5.42mm, 2.25mm, 8a, 8b are 19.4mm, 1.5mm, 9a, 9b are 9.6mm, 2.25mm, 10a, 10b are 28.2mm, 2.25mm, 14a, 14b respectively 21mm, 19.72mm, 15a, 15b are 21mm, 19.72mm, 16a, 16b are 21mm, 19.72mm, 17a, 17b are 21mm, 19.72mm. Port 1 of the antenna works in a frequency band of 2.45 GHz and serves as a sending port. Port 2 works in the 2.4GHz frequency band as a receiving port. When port 1 is excited, the antenna can generate linearly polarized waves in the y direction in the far field; when port 2 is excited, the antenna can generate linearly polarized waves in the far field in the x direction. As shown in Figure 12, the surface current distribution of the patch at 2.4GHz can be seen. In the two frequency bands, the isolation of the two ports is greater than 35dB, as shown in Figure 13. When the port 1 of the antenna is working, the gain of the antenna at the working frequency of port 1 is 2.4GHz is 8.6dBi, and the cross-polarization ratio of the E plane and the H plane is greater than 25dB. When the port 2 of the antenna is working, the antenna is working at the port 2 The gain at the frequency of 2.14GHz is 8.1dBi, the cross-polarization ratio of the E-plane is greater than 30dB, and the cross-polarization ratio of the H-plane is 10dB, as shown in the simulation test patterns 14 and 15 of the antenna.

The above-mentioned embodiment is a preferred implementation mode of the present utility model, but the implementation mode of the present utility model is not limited by the above-mentioned embodiment, and any other changes, modifications and substitutions made without departing from the spirit and principle of the present utility model , combination, and simplification, all should be equivalent replacement methods, and are all included in the protection scope of the present utility model.

Claims (5)

1. a kind of interior full-duplex antenna of band mixing ring based on 180 degree, which is characterized in that the interior full-duplex antenna of the band includes Upper layer medium substrate, layer dielectric substrate and two are used for the T-type probe of couple feed, and two of which T-type probe is respectively by the One horizontal arm and the first upright arm and the second horizontal arm and the second upright arm vertical connection are constituted,

The upper surface of the upper layer medium substrate is printed with rectangular micro-strip radiation patch, under the layer dielectric substrate Surface is printed with the first level arm and second horizontal arm,

The upper surface of the layer dielectric substrate is printed with reflection floor, and the lower surface of the layer dielectric substrate is printed with 180 degree mixes ring feeding network, and it includes three sections of quarter-wave first micro-strips that the 180 degree, which mixes ring feeding network, 4th microstrip line of line, the second microstrip line and third microstrip line and one section of 3/4ths wavelength, the 180 degree mix ring feedback Electric network includes four ports, wherein two ports are as isolated port by the first impedance transformation line of different impedances and second Impedance transformation line and the 5th microstrip line are drawn, and transmitting terminal and receiving terminal are used separately as；Another two port is then micro- through the 6th respectively Band line and the 7th microstrip line are drawn, and are connected with the first upright arm of two T-type probes and the second upright arm.

2. the band interior full-duplex antenna according to claim 1 for mixing ring based on 180 degree, which is characterized in that described the One horizontal arm and second horizontal arm are rectangular microstrips, and along the diagonal line position of the rectangular micro-strip radiation patch It sets symmetrically placed, is mutually orthogonal to one another.

3. the band interior full-duplex antenna according to claim 1 for mixing ring based on 180 degree, which is characterized in that described the One upright arm and second upright arm are metal probes, and the both sides of the geometric center positioned at rectangular micro-strip radiation patch Symmetric position, while one end of two metal probes is connected with the 6th microstrip line and the 7th microstrip line respectively, the other end is then distinguished Through-hole on reflection floor and layer dielectric substrate is connected with two horizontal arms of two T-type probes.

4. the band interior full-duplex antenna according to claim 1 for mixing ring based on 180 degree, which is characterized in that signal is through hair The port for penetrating end arrives separately at two T-type probes, and the signal amplitude of two T-type probes of arrival is equal and phase differs 180 degree, it Rectangular micro-strip is coupled to by the first level arm and the second horizontal arm of two horizontal directions of two T-type probes afterwards and radiates patch Piece is radiate, and the line polarization wave in the directions y is generated at Antenna Far Field.

5. the band interior full-duplex antenna according to claim 1 for mixing ring based on 180 degree, which is characterized in that signal is through connecing The port of receiving end arrives separately at two T-type probes, and the signal amplitude and phase of two T-type probes of arrival are equal, pass through later The first level arm and the second horizontal arm of two horizontal directions of two T-type probes are coupled to rectangular micro-strip radiation patch radiation It goes out, the line polarization wave in the directions x is generated at Antenna Far Field.