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An extremely miniaturized microstrip branch-line coupler

✍ Scribed by Mehdi Nosrati

Book ID
102522952
Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
263 KB
Volume
51
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

In this letter, an extremely miniaturized branch‐line coupler (BLC) operating at 0.9 GHz is analyzed, designed, and introduced to enhance the bandwidth accompanied by highly size reduction without via‐holes, multilayered technique, and air‐bridged. A combination of a simple low‐pass and band‐stop filters is proposed to increase isolation between BLC's ports. This model is equaled by a quarter‐wavelength line and necessary equations are obtained using even and odd modes analysis. A compact BLC is designed and tested using this technique. It is shown that the proposed BLC works as well as conventional ones though with size reduction of about 74% and 4.5% enhancement in bandwidth in analogy with recent branch‐line coupler. The measurement results are in good agreement with the theoretical. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1403–1406, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24365

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