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    Multistrip monopole antenna for UWB applications
    (2012) Özden, Okan; Karaaslan, Muharrem; Ünal, Emin; Kapusuz, Dilek
    Design and performance measures of a printed multistrip monopole antenna for ultra-wideband application are presented. The proposed antenna consists of six quarter wavelength strips of different resonant frequency combined in a manner to provide wide bandwidth and omnidirectional pattern. It operates in the frequency range 2.22-15.8 GHz with impedance bandwidth (VSWR < 2) of 6 GHz and maximum gain of 6.02 dBi. The radiation pattern is nearly omnidirectional in the Azimuthal plane and bidirectional in the elevation plane and the consistency of the radiation pattern exists for almost all frequency in the operating band. © 2012 IEEE.
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    Surface wave investigation of different size rectangular patch HIGP and low profile antenna interaction
    (2010) Özdemir, Enver; Ünal, Emin; Karaaslan, Muharrem
    Multi-scale rectangular element mushroom structure high impedance ground plane (HIGP) designed to exhibit larger band gap frequency range to cover greater bandwidth for low profile antenna design. The HIGP's are composed of three different dimensioned rectangular patch mushroom elements for different resonance frequency realization. The characterizations of the three scaled HIGP varying all the dimensions are observed between 1-20 GHz frequency ranges. The effect of the multi-scale HIGP to the return loss of dipole antenna radiates at 8,5 GHz for free space investigated depending on the dipole direction and position. ©2010 IEEE.