NDLI: Dual-Band Branch-Line Coupler Based on Crossed Lines for Arbitrary Power-Split Ratios

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Dual-Band Branch-Line Coupler Based on Crossed Lines for Arbitrary Power-Split Ratios

Content Provider	MDPI
Author	Chang, Hyungjun Lim, Taejun Dimitrov, Kristian Chavdarov Lee, Yongshik
Copyright Year	2022
Description	Dual-band branch-line couplers with arbitrary power-split ratios are presented. The use of crossed lines at the center of the dual-band coupler enables it to independently provide different power-split ratios to the two bands. Additionally, open stubs are utilized to enhance the stopband responses. The complete design procedure with example design curves is provided. For experimental verification, three dual-band couplers with power-split ratio combinations of +3 dB ( $S21:S31=2:1$ ) and −3 dB ( $S21:S31=1:2$ ), −3 dB and +3 dB, and 0 dB ( $S21:S31=1:1$ ) and +13 dB ( $S21:S31=20:1$ ) at 1 GHz and 2.5 GHz were designed and fabricated. The measured results are in excellent agreement with the ideal and full-wave simulated results. The measured difference of −13.3 dB between the power-split ratios of the two bands is the largest reported for a dual-band branch-line coupler.
Starting Page	5527
e-ISSN	14248220
DOI	10.3390/s22155527
Journal	Sensors
Issue Number	15
Volume Number	22
Language	English
Publisher	MDPI
Publisher Date	2022-07-25
Access Restriction	Open
Subject Keyword	Sensors Telecommunications Branch-line Coupler Dual-band Crossed Lines Open-ended Stub Arbitrary Power-split
Content Type	Text
Resource Type	Article

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