학술논문
3-D Printing Dual-Band Cavity Filter With Capacitive Stubs Producing Transmission Zeros
Document Type
Conference
Source
2022 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP) Advanced Materials and Processes for RF and THz Applications (IMWS-AMP), 2022 IEEE MTT-S International Microwave Workshop Series on. :1-3 Nov, 2022
Subject
Language
ISSN
2694-2992
Abstract
This paper presents a dual-band cavity bandpass filter based on basic modes and high-order modes. By adjusting the sizes of the coupling irises between the waveguide ports and cavity resonators, the TE 101 mode and TM 120 mode are excited simultaneously at different frequencies. Therefore, the dual-band filter is designed with two modes. Since the isolation of two passbands is not good, the capacitive stubs are introduced to produce transmission zeros (TZs). Three TZs can be controlled by the sizes of the capacitive stubs, respectively. Owing to the six small capacitive stubs, Three TZs are generated to improve the frequency selectivity. Moreover, the first spurious mode is suppressed. The central frequencies of the two passbands are at 4.55 GHz with a fractional bandwidth of 1.11% and 5.00 GHz with a fractional bandwidth of 0.72%. Finally, a 2 nd -order dual-band cavity bandpass filter is fabricated by 3-D printing technology.