A Design of Tunable Filter Integrated SPDT Switch Based on PIN Diode

Abstract

In this paper, a tunable filter integrated SPDT switch based on PIN diode is proposed. The band-pass filter response is realized by using microstrip lines with different characteristic impedances, and the filter-integrated SPDT switch with tunable center frequency is designed by loading a varactor diode and PIN diodes. The measured results show that its filter response can be tuned in the range of 1.5 to 2.065 GHz, the insertion loss is 1.53-2.69 dB, and with well return loss and port isolation.

Low‐cost ultra‐wideband discrete SPDT switch for K–Ku band in automotive applications and fifth‐generation systems

“…The fourth topology is the series-shunt-shunt switch, commonly used in wireless communication when maximum isolation is required. 27,[31][32][33][34] The automotive radar system has made significant advancements recently, with several applications being simultaneously covered. 35,36 These applications encompass various radar ranges, including collision avoidance, traffic alert, park assist, and integration with 5G wireless systems.…”

“…The third topology is the series‐shunt topology, offering higher isolation. The fourth topology is the series‐shunt‐shunt switch, commonly used in wireless communication when maximum isolation is required 27,31–34 …”

A Filtering Switch Made by an Improved Coupled Microstrip Line

“…This design method aims to improve the circuit's integration, avoid the matching distortion of the filter and switch cascade in the RF (radio frequency) front end, and reduce the integrated circuit's design cost. There are different types of filtering switches, such as those designed with external PIN diodes for harmonic filter switching [5], those designed with cavity-coupled bandpass filters for switching between filter and switch functions [6], and those with an integrated divider and filter as one circuit [7,8]. There are filter switches that are integrated after designing a triplexer using the aggregate component theory [1] and integrated filter switches based on the fractal stub-loaded resonator (F-SLR) design [9].…”