A diplexer with direct coupled resonant junction

Ogbodo, Eugene A.; Ngobigha, Felix; Obadiah Ali, Nyangwarimam; Atuba, Sunday

Abstract

Conventionally, diplexers are designed by connecting two filters of different frequencies using a transmission T-line junction which acts as a distribution network serving the individual filters. Here, a novel diplexer has been proposed and designed to utilize a directly coupled resonator as the distribution network. The directly coupled resonator is designed using two square open-loop resonators of the same resonant frequency of 1.95 GHz. Coupling of the two resonators is achieved using a λ/4 transmission line to directly couple them. This process made the resonator pair to possess a dual-mode resonator function, resonating at 1.85 and 2.05 GHz. Two bandpass filters are then designed in the corresponding modes of the resonator pair with 5% fractional bandwidth and coupled accordingly. This technique allowed the resonator pair to contribute to the resonant poles of the diplexer while functioning as the distribution network

• Journal Article Type: Article
• Acceptance Date: Jan 16, 2021
• Online Publication Date: Jan 16, 2021
• Publication Date: Jun 30, 2021
• Deposit Date: Jul 7, 2025
• Publicly Available Date: Jul 8, 2025
• Journal: Microwave and Optical Technology Letters
• Print ISSN: 0895-2477
• Electronic ISSN: 1098-2760
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 63
• Issue: 6
• Pages: 1677-1681
• DOI: https://doi.org/10.1002/mop.32787
• Public URL: https://uwe-repository.worktribe.com/output/14681388
• Additional Information: Received: 2020-10-11; Accepted: 2021-01-02; Published: 2021-01-16