A new half-mode frequency-tunable SIW (substrate-integrated waveguide) bandpass filter with a constant absolute bandwidth is presented in this paper. For achieving the constant bandwidth, we have developed new external and internal coupling structures capable of exhibiting specified coupling values over the frequency tuning range of the presented filter. Hence, the presented filter employs no tuning components in the coupling structures and this avoids the insertion loss increase due to tuning components. For verification, a second-order filter has been designed, fabricated, and measured. The filter has the insertion loss smaller than 2.0 dB over the frequency tuning range from 1.85 GHz to 2.3 GHz. The bandwidth slightly varies from 136 MHz to 142 MHz.
|Title of host publication||2017 IEEE MTT-S International Microwave Symposium, IMS 2017|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||4|
|Publication status||Published - 2017 Oct 4|
|Event||2017 IEEE MTT-S International Microwave Symposium, IMS 2017 - Honololu, United States|
Duration: 2017 Jun 4 → 2017 Jun 9
|Name||IEEE MTT-S International Microwave Symposium Digest|
|Other||2017 IEEE MTT-S International Microwave Symposium, IMS 2017|
|Period||17/6/4 → 17/6/9|
Bibliographical noteFunding Information:
ACKNOWLEDGMENTS This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Science, ICT & Future Planning(NRF-2015R1C1A1A02036754).
© 2017 IEEE.
- Absolute bandwidth
- Bandpass filter
- Tunable filter
ASJC Scopus subject areas
- Condensed Matter Physics
- Electrical and Electronic Engineering