Design of filtering directional coupler with improved performance. Issue 7 (13th March 2020)

• Record Type: Journal Article
• Authors: Kumar, Mukesh; Islam, Sk Nurul; Sen, Gobinda; Parui, Susanta Kumar; Das, Santanu
• Is Part Of: International journal of RF and microwave computer-aided engineering. Volume 30:Issue 7(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-03-13
• Subjects: band‐pass response -- coupled line -- directional coupler -- high coupling -- high directivity; Microwave devices -- Computer-aided design -- Periodicals; Computer-aided engineering -- Periodicals; 621.3813
• DOI: 10.1002/mmce.22224
• Languages: English
• ISSNs: 1096-4290

Abstract

Abstract: This letter presents a filtering directional coupler (FDC) with enhanced coupling and high directivity simultaneously. The proposed FDC is composed of a pair of coupled lines instead transmission line of a directional coupler. This coupled lines resonator increases the design parameters by which even/odd mode phase velocity can be compensated to improve the directivity and coupling level. The coupling enhancement can be explained by analyzing the even mode and odd mode circuit of the proposed coupler. A prototype of the proposed coupler is designed which provides a high directivity of 44 dB for 6 dB coupling level at 1 GHz frequency. The proposed coupler is designed, fabricated, and tested.