Citation

Roshani, Saeed and Zubir, Farid and Karimi, Mohsen and Chaudhary, Muhammad Akmal and Assaad, Maher and Hazzazi, Fawwaz and Md. Jizat, Noorlindawaty and Roshani, Sobhan (2025) Design of an Ultra Compact 180-Degree Ring Coupler With Harmonic Suppression Using Composite Lines for Modern RF Systems. IEEE Access, 13. pp. 8214-8224. ISSN 2169-3536

Text Design of an Ultra Compact 180-Degree Ring Coupler With Harmonic Suppression Using Composite Lines for Modern RF Systems.pdf - Published Version Restricted to Repository staff only Download (2MB)

Abstract

This paper presents lumped reactive capacitors and inductors to create a compact filtering hybrid ring coupler (HRC) with a broad suppression band. The traditional 180-degree ring coupler has six long λ/4 branches. In the proposed coupler, six compact proposed branches are applied instead of these six long λ/4 branches, resulting in size reduction and harmonic suppression. The designed HRC works at 800 MHz and provide 220 MHz operating bandwidth from 690 MHz from 910MHz, which is equal to 27.5% FBW. The designed HRC has acceptable performance in operating frequency and higher frequencies. The designed 180-degree ring hybrid coupler (HRC) achieves a broad stop-band ranging from 1.7 GHz to 5 GHz, effectively rejecting 2nd to 6th harmonic. The proposed HRC is designed, simulated and fabricated, which the measured results validate the simulations. In the pass band, the proposed hybrid coupler exhibits less than 0.2 dB insertion loss, over 26 dB return loss, and 49 dB isolation measured at 800 MHz. Moreover, the conventional 800 MHz HRC occupied 0.5 λ × 0.25 λ (140.7 mm × 70.8 mm), while size of the proposed HRC is 10.7 mm × 6.7 mm (0.038 λ × 0.024 λ), which provides 99% size reduction.

Item Type:	Article
Uncontrolled Keywords:	Size reduction, lumped reactive component, microwave device
Subjects:	T Technology > TP Chemical technology > TP155-156 Chemical engineering
Divisions:	Faculty of Engineering (FOE)
Depositing User:	Ms Rosnani Abd Wahab
Date Deposited:	18 Feb 2025 02:47
Last Modified:	18 Feb 2025 04:26
URII:	http://shdl.mmu.edu.my/id/eprint/13465

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