Ultra-compact self-diplexing antenna based on quarter-mode substrate integrated waveguide with high isolation

This article presents the design of an ultra-compact cavity-backed self-diplexing antenna with high isolation employing quarter-mode substrate integrated waveguide (QMSIW). The proposed antenna is constructed by using QMSIW, slot, and two 50Ω feed lines. Two eighth-mode cavity resonators are designed by inserting a slot on the top side of the rectangular substrate integrated waveguide to operate at 2.6 and 4.9 GHz for long-term evolution and public safety band applications, respectively. The proposed design allows to tune any frequency band independently by keeping other bands unaltered. The size of antenna is ultra-compact, due to the use of QMSIW cavity. The isolation between two ports is >35 dB. The antenna achieves 5.34 and 5.68 dBi peak gains at 2.6 and 4.9 GHz, respectively. The efficiency of the antenna is >85% at both frequency bands. The antenna provides more than 20.9 dB front-to-back-ratio and better than 21 dB separation between co-to-cross polarization levels. The designed antenna is validated through fabrication and measurement.

METHOD FOR IMPROVING THE OPERATIONAL AND TECHNICAL CHARACTERISTICS OF cavity RESONATORS

В работе выполнен анализ известных технических решений в области частотного разноса принимаемого и передаваемого сигналов радиочастотных ретрансляторов сигналов и проблемных вопросов технического характера, связанных с их реализацией, предложено собственное решение улучшения амплитудно-частотных характеристик систем фильтров с использованием объёмных резонаторов, выполненное с учётом современных тенденций реализации подобных систем. Целью работы является повышение технических характеристик объёмных резонаторов. В работе предлагается вариант повышения эксплуатационно-технических характеристик объёмных резонаторов. Предлагаемое решение апробировано на практике, выполнена метрологическая оценка его результатов. Результатом исследования является разработка метода повышения эксплуатационно-технических характеристик объёмных резонаторов, ориентированная на улучшение качества их работы. Предлагаемое решение может быть применено при производстве ремонта и регламентном обслуживании объёмных резонаторов, в ходе их эксплуатации в системах радиосвязи различного назначения, реализованных с их использованием. The paper analyzes the known technical solutions in the field of frequency separation of the received and transmitted signals of radio frequency signal repeaters and technical issues related to their implementation, and offers its own solution to improve the amplitude-frequency characteristics of filter systems using cavity resonators, made taking into account current trends in the implementation of such systems. The aim of this work is to improve the technical characteristics of cavity resonators. In this paper, we propose a variant of improving the operational and technical characteristics of cavity resonators. The proposed solution was tested in practice, metrological evaluation of its results was performed. The result of the research is the development of a method for improving the operational and technical characteristics of cavity resonators, focused on improving the quality of their work. The proposed solution can be applied in the production of repairs and routine maintenance of cavity resonators, during their operation in radio communication systems for various purposes, implemented with their use.