Harmonic suppression by photonic bandgap on CPW‐fed loop‐slot antenna

A conventional CPW-fed loop-slot antenna, incorporating a PBG structure in the feeding network, is presented. Experimental results show that the PBG structure with cross-shaped lattices exhibits a well behaved band-stop characteristic; furthermore, the impedance bandwidth of the proposed antennas also becomes wider than that of the conventional CPW-fed slot antenna. In this design, the impedance bandwidth can reach 1320 MHz, which is about 60% with respect to the central frequency of 2200 MHz. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 41: 154–156, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20077