A new technique for designing wideband microstrip antenna on the basis of the recently proposed substrate integrated waveguide technology is proposed. In this technique, log-periodic slot array antenna on substrate integrated waveguide with different substrate thicknesses and different terminations is presented. The proposed antenna was designed using Ansoft HFSS simulation software package. The antenna is able to achieve an impedance bandwidth of 41 % for a return loss of less than -10 dB.
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