Skip navigation

Microwave diplexer purely based on direct synchronous and asynchronous coupling

Microwave diplexer purely based on direct synchronous and asynchronous coupling

Nwajana, Augustine Onyenwe ORCID: 0000-0001-6591-5269 and Yeo, Kenneth Siok Kiam (2016) Microwave diplexer purely based on direct synchronous and asynchronous coupling. Radioengineering, 25 (2). pp. 247-252. ISSN 1210-2512 (Print), 1805-9600 (Online) (doi:

PDF (Open Access Article)
25806 NWAJANA_Microwave_Diplexer_Purely_Based_On_Direct_Synchronous_Asynchronous_Coupling_(OA)_2016.pdf - Published Version
Available under License Creative Commons Attribution.

Download (658kB) | Preview


A diplexer realized purely based on direct coupling is presented. No cross-coupling is involved in the design process. The microwave diplexer is achieved by coupling a dual-band bandpass filter onto two individual channel filters. This design eliminates the need for employing external junctions in diplexer design, as opposed to the conventional design approach which requires separate junctions for energy distribution. A 10-pole (10th order) diplexer has been successfully designed, simulated, fabricated and measured. The diplexer is composed of 2 poles from the dual-band filter, 4 poles from the Tx bandpass filter, and the remaining 4 poles from the Rx bandpass filter. The design was implemented using synchronously and asynchronously tuned microstrip square open-loop resonators. The simulation and measurement results show that an isolation of 50 dB is achieved between the diplexer Tx and Rx bands. The minimum insertion loss is 2.88 dB for the transmit band, and 2.95 dB for the receive band.

Item Type: Article
Uncontrolled Keywords: microwave, diplexer, coupling, resonator
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Future Technology and the Internet of Things
Faculty of Engineering & Science > School of Engineering (ENN)
Last Modified: 19 Sep 2020 00:20
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
Selected for REF2021: None

Actions (login required)

View Item View Item


Downloads per month over past year

View more statistics