June 14, 2024
Abbas Rezaei

Abbas Rezaei

Academic rank: Assistant professor
Education: Ph.D in Electrical engineering
Phone: 083-38305001
Faculty: Faculty ofٍٍ Electrical Engineering


Design of a novel microstrip four‑channel diplexer for multi‑channel telecommunication systems
Type Article
Microstrip, Four-channel diplexer, Insertion loss, Wireless
Researchers Abbas Rezaei، leila noori، Mohd Haizal Jamaluddin


This paper presents a novel microstrip quad-channel diplexer. The introduced diplexer operates at close resonance frequencies of 1.68 GHz, 1.9 GHz, 3.9 GHz and 4.43 GHz for multi-service wireless applications. The frequency responses of S21 and S31 are sharp at the edges of all passbands. To improve the stopband properties, several transmission zeros are created. Also, the low insertion losses of 0.68 dB, 0.57 dB, 0.71 dB, and 0.5 dB are obtained at the resonance frequencies. The proposed diplexer has a new structure with a compact size of 0.051 × λg 2. To verify the design method and simulation results, the proposed structure is fabricated and measured. There is a good agreement between the simulation and measurement results.