Narrowband Single-Pole Double-Throw Filtering Switch Based on Dielectric Resonator

In this letter, a narrowband single-pole double-throw (SPDT) filtering switch based on dielectric resonators (DRs) is presented. It consists of two DRs shared by two channels for size reduction. Printed circuit boards are embedded in the metal cavity to integrate the PIN diodes. The switching between two channels is enabled by controlling the PIN diodes connected to the two output feeding lines. The electromagnetic field distributions of the DR at the TE $_{11\delta }$ mode are studied to control the coupling between the DR and two output feeding lines. When one channel is on, the PIN diode for this channel is turned off, which does not introduce loss and affect the linearity. For the off-state channel, isolation is obtained by controlling the coupling between the DR and output feeding line, which is considerably enhanced. For demonstration, the DR filtering SPDT switch is implemented. The measured results exhibit that the proposed filtering SPDT switch has narrow bandwidth, low loss, high isolation, and high linearity.

[1]  Shih-Fong Chao.  42 GHz MMIC SPDT bandpass filter-integrated switch using HEMT loaded coupled lines , 2012 .

[2]  Zuo-Min Tsai,et al.  Analysis and Design of Bandpass Single-Pole–Double-Throw FET Filter-Integrated Switches , 2007, IEEE Transactions on Microwave Theory and Techniques.

[3]  Xiu Yin Zhang,et al.  High-Power Filtering Switch With Low Loss and High Isolation Based on Dielectric Resonator , 2017, IEEE Transactions on Microwave Theory and Techniques.

[4]  Jin Xu,et al.  Quasi-Lumped-Element Filter-Integrated Single-Pole Double-Throw Switch , 2017, IEEE Transactions on Microwave Theory and Techniques.

[5]  Lei Zhu,et al.  Triple-Mode Dielectric Resonator Diplexer for Base-Station Applications , 2015, IEEE Transactions on Microwave Theory and Techniques.

[7]  Jian-Fong Wu,et al.  Compact Single-Pole-Double-Throw Switchable Bandpass Filter Based on Multicoupled Line , 2014, IEEE Microwave and Wireless Components Letters.

[8]  Quan Xue,et al.  Analysis and Design of Balanced Dielectric Resonator Bandpass Filters , 2016, IEEE Transactions on Microwave Theory and Techniques.