A Compact, Low-Profile Shorted TM Mode Planar Copolarized Microstrip Antenna for Full-Duplex Systems

• Published in: IEEE antennas and wireless propagation letters Vol. 21; no. 9; pp. 1887 - 1891
• Main Authors: Kumari, Kahani, Saikia, Mondeep, Jaiswal, Rahul Kumar, Malik, Sudha, Srivastava, Kumar Vaibhav
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.09.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: 0}</tex-math> </inline-formula> </named-content> mode; Antenna measurements; Antennas; Bandwidths; Copolarized; defected ground structure (DGS); Full-duplex system; Ground plane; in-band full-duplex; low profile; Microstrip antennas; Patch antennas; Receivers & amplifiers; Receiving antennas; shorted TM<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX"> _{1/2; Slot antennas; Transmitting antennas
• ISSN: 1536-1225; 1548-5757
• DOI: 10.1109/LAWP.2022.3184163

In this letter, a single-layer compact copolarized shorted TM 1/2,0 mode microstrip patch antenna is presented for in-band full-duplex application. Two shorted TM 1/2,0 mode patch antennas, used for transmission and reception purposes, make the structure compact. The wideband behavior of the patch antenna is obtained by fusing the two resonances, one because of the shorted TM 1/2,0 mode radiating patch and the other because of the λ/4 line resonator. To enhance the isolation between the transmitter and receiver antenna, a novel defected ground structure is used. Slots are introduced into the ground plane to create a weak field region for the basic antenna element. The other antenna element (receiver) is located in the weak field region to enhance isolation. Further enhancement in isolation is achieved by introducing a T-shaped metallic strip into the slots. The structure is proposed with the credits of compactness, enhanced bandwidth, colinear polarization, very less fabrication complexity, low profile, and high isolation. The proposed structure is fabricated and measured. The structure experimentally exhibits a bandwidth (≤ −10 dB) of 2.42-2.52 GHz with the isolation of 25 dB, peak isolation of 36 dB, and an average realized gain of 4 dBi in the entire band.