NDLI: SIW planar balun with enlarged bandwidth

Content Provider	IET Digital Library
Author	Fu, Yunhao Chan, King Yuk Gong, Liang Ramer, Rodica
Abstract	An X-band substrate integrated waveguide (SIW) balun, based on a Y-type divider with enlarged bandwidth, is presented in this study. In most SIW Y-type dividers, the undesired TE30 mode either leads to the deterioration of the in-band reflection or constrains the bandwidth by a transmission zero. The cause of the transmission zero is analysed and the modes coupling, rather than the step impedance matching, is utilised to reduce its impact. In the traditional Y-type divider, the frequency band is split by this transmission zero, while in the proposed wideband configuration, the co-existences of the TE10 and TE30 modes are employed to combine the two non-contiguous bands. A broadband balun is designed and fabricated, with the improved Y-type wideband divider serving for the power-dividing part. The dividing ports are connected to the reversely placed transitions, achieving inherent out-of-phase performance and good amplitude property. The measurement of the balun suggests a 43.94% bandwidth from 8.23 to 12.89 GHz, with 15 dB return loss. The measured amplitude and phase imbalance between two output ports are below 0.7 dB and ±3°, respectively. The performance of the fabricated balun is in agreement with the simulation, and it is promising for wideband applications.
Starting Page	141
Ending Page	146
Page Count	6
ISSN	17518725
Volume Number	14
e-ISSN	17518733
Issue Number	Issue 2, Feb (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/14/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2019.0118
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2019-10-22
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Baluns Broadband Balun Dividing Ports Enlarged Bandwidth Frequency 8.23 GHz to 12.89 GHz Frequency Band Impedance Matching In-band Reflection Loss 15.0 DB Mode Coupling Noncontiguous Band Out-of-phase Performance Phase Imbalance Power Divider Power-dividing Part SIW Planar Balun SIW Y-type Divider Step Impedance Matching Substrate Integrated Waveguide TE10 Mode TE30 Mode Transmission Zero Waveguide And Microwave Transmission Line Component Wideband Configuration X-band Substrate Integrated Waveguide Balun Y-type Wideband Divider
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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