Abstract
We propose a very simple but effective method to switch a single-band antenna into a dual-band antenna by inserting a narrow radiation-prohibited band in the middle of the single pass band. To insert the radiation-rejection band, we intentionally induce strong resonance on a metamaterial-motivated split ring resonator (SRR) by placing it near a signal feeding transmission line of a proximity-coupled microstrip patch antenna, which blocks out flow of electromagnetic waves through the line. To maximize the blockage, we cut the SRR into a quadrangular loop that is exactly interlocked with the two sides of the right-angled microstrip line. Consequently, we show that we can split one pass band into two separated pass bands with an inserted sharp stop band in-between. Good agreements between the prediction and the measurement prove the validness of our approach. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:961–965, 2014
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