A Compact and Wideband Coupled-Line Coupler with High Coupling Level Using Shunt Periodic Stubs
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Date
2013-04
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Mark
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Společnost pro radioelektronické inženýrství
Abstract
A wideband microstrip forward-wave coupled-line coupler with high coupling value is presented. Compared with the conventional edge-coupled microstrip forward-wave coupler, this symmetrical structure, consisting periodic shunt stubs between the two coupled-lines, achieves wider operating bandwidth and larger coupling level. To characterize this structure, the equivalent circuit model is established and verified by measurement and full-wave results. The designed and fabricated prototype is a 0-dB forward-wave coupler with 0.6 mm stub length. This coupler exhibits a coupled amplitude balance of ±2 dB, good matching (15dB) and at least 15dB isolation between adjacent ports over a wide bandwidth of 66% from 2 GHz to 4 GHz centered at 3 GHz. The coupled-line length and width of the proposed structure are approximately λg/2 and λg/13, respectively, which makes it more compact than the conventional forward coupled-line couplers.
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Citation
Radioengineering. 2013, vol. 22, č. 1, s. 323-327. ISSN 1210-2512
http://www.radioeng.cz/fulltexts/2013/13_01_0323_0327.pdf
http://www.radioeng.cz/fulltexts/2013/13_01_0323_0327.pdf
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Peer-reviewed
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en