A novel switchable dual-mode resonator is presented for a compact tunable bandpass filter (BPF) with a wide frequency tuning range and a constant absolute bandwidth (ABW). The dual-mode resonator switches between a low-band state and a high-band state with p-i-n diodes to overcome the limited tunability of varactor diodes. The bandpass frequency can be easily tuned by controlling two resonant frequencies of each state using the varactor diodes and the ABW remains constant by tapped-line input and output coupling. To verify the presented structure, a 2-pole tunable BPF is fabricated and measured, which shows an in-band insertion loss of 2.3-5.8 dB maintaining a constant 3-dB ABW of 110 MHz with a tuning range from 360 MHz to 970 MHz.
|Title of host publication||Proceedings of the 2018 IEEE/MTT-S International Microwave Symposium, IMS 2018|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||4|
|Publication status||Published - 2018 Aug 17|
|Event||2018 IEEE/MTT-S International Microwave Symposium, IMS 2018 - Philadelphia, United States|
Duration: 2018 Jun 10 → 2018 Jun 15
|Name||IEEE MTT-S International Microwave Symposium Digest|
|Conference||2018 IEEE/MTT-S International Microwave Symposium, IMS 2018|
|Period||18/6/10 → 18/6/15|
Bibliographical noteFunding Information:
ACKNOWLEDGMENT This work was supported by YSSRC and Space Core Technology Program through the National Research Foundation of Korea funded by the Ministry of Science and ICT. (NRF-2017M1A3A3A02016255).
© 2018 IEEE.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Electrical and Electronic Engineering