Design and Analysis of Diplexer using Various Types of Band Pass Filters

Aditi Sharma, Shadab Mohd Siddiqui, R. Gowri, Abhinav Sharma
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Abstract

The main aim of this research is to design a diplexer for 5G communications as proposed by TRAI 3.4 GHz to 3.6 GHz. The device consists of Wilkinson power divider, Band Pass Filters (BPF) with 20 MHz bandwidth. Filters and power combiners are realized with center frequency of the band (3.5 GHz). Uplink frequency choosen is 3.41 to 3.49 GHz and downlink frequency choosen is 3.51–3.59 GHz. In this device the two band pass filtering structures (for both uplink and downlink) are joined by a three port junction. The diplexer design is done by dividing the structure in two parts, to make the design more efficient and feasible. Eventually the whole diplexer is optimized to fit the desired specifications. In this paper band pass filters are designed using coupled lines, short circuited stubs and also with capacitive coupled resonators. Performance of the diplexer is compared among all three filter configurations.
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采用各种带通滤波器的双工器设计与分析
本研究的主要目的是为TRAI提出的3.4 GHz至3.6 GHz的5G通信设计一种双工器。该器件由威尔金森功率分配器、带宽为20 MHz的带通滤波器(BPF)组成。滤波器和功率合成器的中心频率为3.5 GHz。上行选频3.41 ~ 3.49 GHz,下行选频3.51 ~ 3.59 GHz。在该设备中,两个带通滤波结构(用于上行链路和下行链路)由三端口连接连接。双工器的设计分为两部分,使设计更加高效和可行。最终,整个双工器被优化以符合所需的规格。本文设计了采用耦合线、短路存根和电容耦合谐振器的带通滤波器。在所有三种滤波器配置中比较了双工器的性能。
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