Miniaturized wide-band rat-race coupler
Miniaturized wide-band rat-race coupler
New designs of wide-band rat-race couplers are proposed. The wide-band operation is achieved with the use of the microstrip nonuniform transmission line sections for the branches of the conventional rat-race coupler. The design formulas are developed using ABCD matrix and the even- and odd-mode analysis. The theoretical analysis has been verified by measurements of the two manufactured wideband rat-race couplers, one operate within 0.85-1.92 GHz and other within 1.55-3.55 GHz frequency range with the equal normalized characteristic impedance functions. For both fabricated couplers, the isolation parameter is better than 15 dB over a 77% relative bandwidth. Also, it is shown that the designed wide-band rat-race coupler can be realized in higher frequency bands with the fixed fractional bandwidth.
broad-band, hybrid ring, microstrip, nonuniform transmission line, rat-race
675-681
Taravati, Sajjad
0026f25d-c919-4273-b956-8fe9795b31ce
October 2013
Taravati, Sajjad
0026f25d-c919-4273-b956-8fe9795b31ce
Taravati, Sajjad
(2013)
Miniaturized wide-band rat-race coupler.
International Journal of RF and Microwave Computer-Aided Engineering, 23 (6), .
(doi:10.1002/mmce.20703).
Abstract
New designs of wide-band rat-race couplers are proposed. The wide-band operation is achieved with the use of the microstrip nonuniform transmission line sections for the branches of the conventional rat-race coupler. The design formulas are developed using ABCD matrix and the even- and odd-mode analysis. The theoretical analysis has been verified by measurements of the two manufactured wideband rat-race couplers, one operate within 0.85-1.92 GHz and other within 1.55-3.55 GHz frequency range with the equal normalized characteristic impedance functions. For both fabricated couplers, the isolation parameter is better than 15 dB over a 77% relative bandwidth. Also, it is shown that the designed wide-band rat-race coupler can be realized in higher frequency bands with the fixed fractional bandwidth.
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Published date: October 2013
Keywords:
broad-band, hybrid ring, microstrip, nonuniform transmission line, rat-race
Identifiers
Local EPrints ID: 482602
URI: http://eprints.soton.ac.uk/id/eprint/482602
ISSN: 1096-4290
PURE UUID: 3fd12f26-5d25-4471-8c6d-a6be2872a11c
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Date deposited: 10 Oct 2023 17:00
Last modified: 02 May 2024 02:05
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Author:
Sajjad Taravati
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