NDLI: Novel planar quasi-TEM transmission line with high isolation and its application to T-junction power divider

Content Provider	IET Digital Library
Author	Guo, Fangzhou Xia, Lei Wu, Qingzhi Xu, Ruimin
Abstract	In this study, a novel quasi-transverse electromagnetic (TEM) transmission line (TL) on a single-layer substrate is presented. The proposed structure comprises bilateral metalised vias and two longitudinal slots on the top and bottom plates, respectively. This two-conductor TL separated by the two slots allows the quasi-TEM mode and guarantees high isolation due to the vias which constrain the electromagnetic field. Additionally, the proposed structure provides a remarkable high range of the characteristic impedance, enabling a more flexible design. Furthermore, an empirical analytical formula is derived to calculate the characteristic impedance of the proposed TL adopting conformal mapping, and modified by a polynomial fraction. The transitions to the double-sided parallel-strip line and the microstrip line are proposed with which the propagation constant of this TL is extracted. The comparisons of the far-end couplings of several types of microwave TLs have been provided by the simulation and measurement to verify the isolation property of the proposed TL. Finally, the proposed TL is applied to the T-junction wideband power divider design to demonstrate its practicability. A prototype is fabricated and measured with a wide operating bandwidth from 6.8 to 17.6 GHz.
Starting Page	1089
Ending Page	1095
Page Count	7
ISSN	17518725
Volume Number	14
e-ISSN	17518733
Issue Number	Issue 10, Aug (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/14/10
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2018.6140
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2020-05-12
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Algebra Bandwidth 6.8 GHz to 17.6 GHz Bilateral Metalised Vias Characteristic Impedance Conformal Mapping Double-sided Parallel-strip Line Electromagnetic Field Empirical Analytical Formula Far-end Couplings Flexible Design Isolation Property Longitudinal Slot Microstrip Line Microwave TLs Novel Planar QuasiTEM Transmission Line Novel Quasitransverse Electromagnetic Transmission Line Polynomial Polynomial Fraction Power Divider Propagation Constant QuasiTEM Mode Single-layer Substrate T-junction Power Divider T-junction Wideband Power Divider Design TEM TL Transmission Line Two-conductor TL Waveguide And Microwave Transmission Line Component
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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