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A new technique for Peano fractal loaded monopole antenna to enhance impedance bandwidth by loading shorting pins is presented. Simulated and measured data show that relative impedance bandwidths of the proposed order 1 and order 2 antennas achieve 23 and 28% for VSWR less than 2 in L-band, which are enhanced 90 and 75% than those of conventional ones, respectively, while the profile and radiation patterns change little. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2045–2048, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23583 [ABSTRACT FROM AUTHOR]

The effect of a finite ground plane on Peano monopole antenna is investigated. Simulated and measured data indicate that when the size of ground plane decreases, impedance bandwidth and gain of the antenna will decrease, H-plane pattern will change little, 3-dB beam width will become wider and elevation angle will be smaller in E-plane. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3087–3090, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22891 [ABSTRACT FROM AUTHOR]

A compact dual‐mode dual‐band bandpass filter (BPF) for WLAN applications is presented. On the basis of a primary passband formed by a ring resonator, a second passband is introduced by taking advantage of its tightly coupled input and output structures. Therefore, a dual‐band performance is achieved without increasing the overall circuit size. Shorting vias and spurlines are adopted separately to realise the dual‐mode excitation of each passband. Finally, a compact dual‐mode BPF centred at 2.4 and 5.2 GHz is designed and fabricated, along with four transmission zeros, leading to sharp skirts and a wide stopband. Experimental results reveal good agreement with simulation results. [ABSTRACT FROM AUTHOR]