Miniaturisation of branch line couplers with a compact transmission line topology based on coupled line section. Issue 5 (26th February 2020)

• Record Type: Journal Article
• Authors: Kumar, Mukesh; Islam, Sk Nurul; Sen, Gobinda; Mitra Das, Tannistha; Parui, Susanta Kumar; Das, Santanu
• Is Part Of: IET microwaves, antennas & propagation. Volume 14:Issue 5(2020)
• Page Start: 448
• Page End: 455
• Publication Date: 2020-02-26
• Subjects: waveguide couplers -- coupled transmission lines; coupled line section -- high impedance series line -- compact transmission line topology -- branch line couplers -- even–odd mode analysis -- harmonic suppression characteristic -- frequency 0.85 GHz; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2019.0660
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract : This study presents a compact transmission line topology to reduce the circuit size of single‐ and two‐section branch line couplers (BLCs). The proposed transmission line is composed of a high impedance series line and one coupled line section. The coupled line section consists of two high impedance series lines and one coupled line. The proposed line is analysed with even–odd mode analysis to derive closed‐form design equations. To validate the equations, a compact single‐ and two‐section BLCs are designed at 0.85 GHz based on the proposed line. The physical size occupied by the proposed single‐ and two‐section BLCs is 23 and 19.5%, respectively, compared to conventional BLCs. Moreover, the proposed transmission line demonstrates the harmonic suppression characteristic due to the coupled line section. As a result of which, the second‐ and third‐order harmonic of the proposed BLCs are suppressed. The proposed BLCs are designed, fabricated, and tested.