Miniaturized branch-line coupler based on slow-wave microstrip lines. Issue 10 (22nd August 2018)

• Record Type: Journal Article
• Authors: Alhalabi, H.; Issa, H.; Pistono, E.; Kaddour, D.; Podevin, F.; Abouchahine, S.; Ferrari, P.
• Is Part Of: International journal of microwave and wireless technologies. Volume 10:Issue 10(2018)
• Page Start: 1103
• Page End: 1106
• Publication Date: 2018-08-22
• Subjects: Branch-line coupler, -- EM field theory, -- passive components and circuits; Wireless communication systems -- Periodicals; Microwave circuits -- Periodicals; Radio frequency -- Periodicals; 621.381305
• DOI: 10.1017/S1759078718001204
• Languages: English
• ISSNs: 1759-0787

Abstract

Abstract: This paper presents a miniaturized 3-dB branch-line coupler based on slow-wave microstrip transmission lines. The miniaturized coupler operating at 2.45 GHz is designed and implemented on a double-layer printed circuit board substrate with blind metallic vias embedded in the lower substrate layer providing the slow-wave effect. Based on this concept, a 43% size miniaturization is achieved as compared with a classical microstrip branch-line coupler prototype. The measured S parameters present a return loss of 25.5 dB and an average insertion loss equal to 0.05 dB at the operating frequency.