In this paper, we present a new method for designing absorptive bandpass filters using coupled lines. The new design method and filter structure allow an absorptive bandpass filter to have good impedance matching performance over a wider frequency range in comparison with distributed-element absorptive filters reported in the literature. Closed form design equations are provided so that a filter can be designed in a way to produce a target frequency response. For verifying the presented design approach, a second-order absorptive bandpass filter centered at 2 GHz having 10% fractional bandwidth has been designed, fabricated, and measured. The measurement shows that the return losses (S11 and S22) are overall larger than 10 dB from DC to 3 f0.
|Title of host publication||IMS 2020 - 2020 IEEE/MTT-S International Microwave Symposium|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||4|
|Publication status||Published - 2020 Aug|
|Event||2020 IEEE/MTT-S International Microwave Symposium, IMS 2020 - Virtual, Los Angeles, United States|
Duration: 2020 Aug 4 → 2020 Aug 6
|Name||IEEE MTT-S International Microwave Symposium Digest|
|Conference||2020 IEEE/MTT-S International Microwave Symposium, IMS 2020|
|City||Virtual, Los Angeles|
|Period||20/8/4 → 20/8/6|
Bibliographical noteFunding Information:
ACKNOWLEDGMENT This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF-2018R1A2B6006095).
© 2020 IEEE.
- Absorptive filters
- Distributed-element filters
ASJC Scopus subject areas
- Condensed Matter Physics
- Electrical and Electronic Engineering