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Novel Configuration of an Elliptic Waveguide Filter Using TE103 Mode for the Q-Band OMUX
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- Authors
- Naeun Shin, Changsoo Kwak, Dong-Pil Chang
- Issue Date
- 2026-07
- Citation
- IEEE Microwave and Wireless Technology Letters, v.36, no.7, pp.1108-1111
- ISSN
- 2771-957X
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- This letter presents a three-channel Q-band output multiplexer (OMUX) based on pseudo-elliptic TE103-mode waveguide filters with diagonal cross coupling. The elliptic-function condition is derived using a coupling-matrix formulation, and the proposed structure is shown to satisfy the required coupling relationships. A folded resonator configuration is introduced to realize the cross-coupling while maintaining a compact structure. The OMUX operates with three channels centered from 37.9 to 39.5 GHz, each providing a 700 MHz bandwidth. An efficient design procedure combining equivalent-circuit optimization and full-wave 3-D electromagnetic (EM) simulation is employed, significantly reducing the design time. Measurements of the fabricated prototype show good agreement with simulations, achieving an in-band return loss better than 20 dB, out-of-band rejection exceeding 18 dB at a 100 MHz offset, and a minimum insertion loss of 0.5 dB. The proposed approach provides a compact and thermally efficient Q-band OMUX solution suitable for satellite payload applications.
- Keyword
- Cross-coupling, output multiplexer (OMUX), Q-band, satellite communications, waveguide filter
- KSP Keywords
- 100 MHz, 700 MHz, 9.5 GHZ, Circuit optimization, Design procedure, Design time, Efficient design, Electromagnetic (EM) simulation, Equivalent circuit(EC), MHz bandwidth, Matrix formulation