Dual-Band Ortho-Mode Transducer With Irregularly Shaped Diaphragm

Abstract

Abstract-A compact dual-band ortho-mode transducer is presented in this paper. Two orthogonally polarized signals received by a square waveguide are separated into two orthogonal channels at 10.7-12.75 GHz and 10.3-11.9 GHz, respectively, while a single-polarized signal is transmitted at 14-14.5 GHz. To obtain good isolation between the transmit (Tx) and receive (Rx) channels of the same polarization with a compact size, an irregularly shaped diaphragm is proposed as a compact dual-function resonator, which has one transmission zero at the Tx band and one pole at the Rx band. The designed OMT is fabricated and measured in a back-to-back configuration. Measured results agree very well with simulated ones and the isolation improvement by the diaphragm is about 15 dB, which verifies our design.

Isolation improvement of a TRx stacked microstrip patch antenna using double spur‐line band rejection filters

“…In ultra-wideband (UWB) communication systems, one of the key issues is the design of a compact antenna while providing wideband characteristic over the whole operating band. Consequently, a number of microstrip antennas with different geome-tries have been experimentally characterized [1,2]. Moreover, other strategies to improve the impedance bandwidth have been investigated [3][4][5].…”

“…For wideband application, parasitic patches are often stacked over the exciter, but stacking parasitic patches dramatically decreases its port-to-port isolation performance. Inadequate isolation would cause failure for the sensitive Rx channel, because Tx signal in a transceiver is usually very strong due to a high power amplifier [2]. Therefore, poor isolation of a stacked microstrip patch antenna prohibits the direct integration with active microwave components to form low-cost transceivers without expensive front-end filters.…”

A Novel Dual-Band Dual-Polarized Ortho-Mode Transducer

“…Meanwhile, it can facilitate the matching of the horizontal polarization between the lateral and common ports [1]. To improve the isolation at the Rx port, an irregularly shaped diaphragm is proposed in [5]. However, the thickness of the diaphragm is only 0.5 mm, thus the diaphragm is easily distorted when processed resulting in bad performance of the OMT.…”

“…Due to different requirements, there are a number of OMT design solutions [1][2][3][4][5]. The classification is designed mainly based on bandwidth, isolation between polarizations, and other electrical and mechanical aspects [3].…”

Realization of Ku-Band Ortho Mode Transducer With High Port to Port Isolation

“…Several dual-band and multi-band OMTs in coupled waveguide, Fin line, planar and quad ridges waveguide configurations have been reported in the past [7][8][9][10][11][12]. The design of dual/multi-band OMTs is very complex as it should operate over wide band of frequencies, and port to port isolation should also be met.…”