Abstract
This paper presents the design and analysis of multi-section dual band branch line coupler (BLC) using meta line structures. This BLC incorporates enhanced bandwidth of multi-section topology and miniaturization capabilities of composite right/left hand (CRLH) configuration structures. A prototype is designed and fabricated to operate at GSM 900 MHz and ISM 2.45 GHz. The designed structure achieves miniaturization of 47% with coupling bandwidth 18% in lower band and 28.1% in upper band. Phase imbalance between the output ports in both the bands is ≤ 50 for this coupling bandwidth.
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