CN-116454634-B - Full duplex antenna based on gap coupling differential feed

CN116454634BCN 116454634 BCN116454634 BCN 116454634BCN-116454634-B

Abstract

The invention discloses a full duplex antenna based on gap coupling differential feed, which comprises two pairs of butterfly dipole antennas, a first dielectric plate, four groups of signal transmission lines, a metal floor, a second dielectric plate, two U-shaped feed networks and a third dielectric plate, wherein the two pairs of butterfly dipole antennas are vertically arranged on the upper surface and the lower surface of the first dielectric plate and used for radiating horizontal polarized waves and vertical polarized waves, four T-shaped gaps with identical dimensions are etched on the metal floor for generating differential signals, the differential signals at the T-shaped gaps are transmitted to the feed positions of the dipole antennas by utilizing four groups of vertically arranged transmission lines, and the two U-shaped feed networks are arranged on a non-dielectric layer and are mutually vertical, so that larger port isolation is obtained.

Inventors

LIAN RUINA
ZHANG TIANHANG
ZHANG JINLONG
Qin mian
HAN JIAQI
ZHAO XINGQIANG

Assignees

河南大学

Dates

Publication Date: 20260508
Application Date: 20230518

Claims (8)

1. The full duplex antenna based on the gap coupling differential feed is characterized by comprising two pairs of butterfly dipole antennas, a first dielectric plate, four groups of signal transmission lines, a metal floor, a second dielectric plate, two U-shaped feed networks and a third dielectric plate, wherein the signal transmission lines are vertically arranged; the two pairs of butterfly dipole antennas are respectively arranged on the upper surface and the lower surface of the first dielectric plate, and are mutually perpendicular to form a mutually perpendicular dual-polarized radiation mode; the second dielectric plate is arranged below the first dielectric plate, the metal floor is arranged on the lower surface of the second dielectric plate, the metal floor is provided with four identical T-shaped gaps, the four T-shaped gaps are symmetrically distributed about the center of the metal floor and are arranged centripetally at the vertical parts of the four T-shaped gaps, the distance between a pair of oppositely arranged T-shaped gaps is g2, and the two pairs of butterfly dipole antennas are correspondingly arranged with the four identical T-shaped gaps through four groups of vertically arranged signal transmission lines; the third dielectric plate is arranged below the metal floor, the two U-shaped feed networks are respectively arranged on the upper surface of the second dielectric plate and the lower surface of the third dielectric plate, the two U-shaped feed networks are respectively arranged on the vertical angles from top to bottom, two ends of one U-shaped feed network are respectively arranged on two long parts of one pair of oppositely arranged T-shaped gaps in a vertically crossed mode, two ends of the other U-shaped feed network are respectively arranged on two long parts of the other pair of oppositely arranged T-shaped gaps in a vertically crossed mode, the parasitic metal belt is used for connecting two oppositely arranged metal patches, the parasitic metal belt comprises a first metal narrow belt, a second metal narrow belt and two elliptic metal sheets, the first metal narrow belt and the second metal narrow belt are respectively and symmetrically arranged on the connected metal iron sheets in a parallel mode, and two ends of the first metal narrow belt and the second metal narrow belt are respectively connected through the two elliptic metal sheets.
2. The full duplex antenna based on slot coupled differential feed according to claim 1, wherein the bowtie dipole antenna is formed by a pair of symmetrically placed trapezoidal metal patches with small ends disposed opposite each other, and a slot between the two metal patches is set to g1.
3. The full duplex antenna according to claim 1, further comprising a metal reflective cavity, wherein the metal reflective cavity is located below the third dielectric plate, i.e. the lowest surface of the antenna, and the metal reflective cavity is formed by a box structure without a cover, so as to increase the far field radiation gain of the antenna.
4. The full duplex antenna based on slot coupling differential feed according to claim 1, wherein the signal transmission line is divided into a plurality of sections from top to bottom, and the sections have different widths for matching the required impedance.
5. The full duplex antenna based on gap coupling differential feed according to claim 1, wherein the U-shaped feed network comprises a first microstrip feed line, a second microstrip feed line, a third microstrip feed line and a fourth microstrip feed line, wherein the midpoint of the second microstrip feed line is vertically and fixedly connected with one end of the first microstrip feed line, the third microstrip feed line and the fourth microstrip feed line are respectively and symmetrically arranged at two ends of the second microstrip feed line in parallel, the third microstrip feed line and the fourth microstrip feed line have the same structure, and the other end of the first microstrip feed line is used for connecting a feed port.
6. The full duplex antenna based on gap coupling differential feed of claim 3, wherein the metal reflecting cavity is located below the third dielectric plate, and comprises a first metal plate horizontally placed, a second metal plate, a third metal plate, a fourth metal plate and a fifth metal plate vertically surrounding the periphery of the first metal plate, wherein the second metal plate, the third metal plate, the fourth metal plate and the fifth metal plate are the same in size and 5mm in height, and the distance between the bottom of the metal reflecting cavity and the third dielectric plate is 5mm.
7. The full duplex antenna based on slot coupled differential feed according to claim 1, wherein the T-slot is comprised of a first slot and a second slot placed perpendicular to the first slot.
8. The full duplex antenna according to claim 5, wherein the third microstrip line and the fourth microstrip line of the U-shaped feeding network are disposed below a second slot constituting a T-shaped slot, and the lengths of the third microstrip line and the fourth microstrip line extending out of the second slot are set to 6 mm.

Description

Full duplex antenna based on gap coupling differential feed Technical Field The invention relates to the technical field of antennas, in particular to a full duplex antenna based on gap coupling differential feed. Background Currently, available spectrum resources are very limited, and with the rapid development of wireless communication, these spectrum resources become increasingly crowded, and how to improve spectrum utilization is a key research topic. Currently, most wireless communication systems have terminals (e.g., base stations, relays, and mobile terminals) that transmit signals and receive signals. Most of these communication systems are time division or frequency division duplex communication systems, that is, the terminals do not transmit signals and receive signals at the same time or frequency band, which restricts the rapid development and application of wireless communication. Meanwhile, the communication mode of the same-frequency full duplex provides a solution for improving the utilization efficiency of spectrum resources, and is one of key technologies of future wireless communication. Disclosure of Invention The invention aims to provide a full duplex antenna based on slot coupling differential feed, which can simultaneously transmit and receive wireless signals on the same frequency, thereby improving the frequency spectrum utilization efficiency. The invention adopts the technical scheme that: A full duplex antenna based on gap coupling differential feed comprises two pairs of butterfly dipole antennas, a first dielectric plate, four groups of signal transmission lines which are vertically arranged, a metal floor, a second dielectric plate, two U-shaped feed networks and a third dielectric plate; the two pairs of butterfly dipole antennas are respectively arranged on the upper surface and the lower surface of the first dielectric plate, and are mutually perpendicular to form a mutually perpendicular dual-polarized radiation mode; the second dielectric plate is arranged below the first dielectric plate, the metal floor is arranged on the lower surface of the second dielectric plate, the metal floor is provided with four identical T-shaped gaps, the four T-shaped gaps are symmetrically distributed about the center of the metal floor and are arranged centripetally at the vertical parts of the four T-shaped gaps, the distance between a pair of oppositely arranged T-shaped gaps is g2, and the two pairs of butterfly dipole antennas are correspondingly arranged with the four identical T-shaped gaps through four groups of vertically arranged signal transmission lines; The third dielectric plate is arranged below the metal floor, the two U-shaped feed networks are respectively positioned on the upper surface of the second dielectric plate and the lower surface of the third dielectric plate, and the two ends of one U-shaped feed network are respectively and vertically crossed with the two long parts of one pair of oppositely arranged T-shaped gaps from top to bottom, and the two ends of the other U-shaped feed network are respectively and vertically crossed with the two long parts of the other pair of oppositely arranged T-shaped gaps. The butterfly dipole antenna is composed of symmetrically placed trapezoid metal patches, wherein small ends are arranged in opposite directions, and a gap between the two metal patches is g1. The metal patch structure also comprises a parasitic metal strip, wherein the parasitic metal is used for connecting two metal patches which are arranged in opposite directions. The metal parasitic band comprises a first metal narrow band, a second metal narrow band and two elliptic metal sheets, wherein the first metal narrow band and the second metal narrow band are respectively and symmetrically arranged on the continuous metal iron sheets in parallel, and two ends of the first metal narrow band and the second metal narrow band are respectively connected by the two elliptic metal sheets. The antenna also comprises a metal reflecting cavity, wherein the metal reflecting cavity is positioned below the third dielectric plate, namely the lowest surface of the antenna, and the metal reflecting cavity is formed by a box body structure without a cover and is used for increasing the far-field radiation gain of the antenna. The signal transmission line is divided into a plurality of sections from top to bottom, and the sections have different widths and are used for matching the required impedance. The U-shaped feed network comprises a first microstrip feed line, a second microstrip feed line, a third microstrip feed line and a fourth microstrip feed line, wherein the midpoint of the second microstrip feed line is vertically and fixedly connected with one end of the first microstrip feed line, the third microstrip feed line and the fourth microstrip feed line are respectively and symmetrically arranged at two ends of the second microstrip feed line in parallel, the third microst