Design and Fabrication of Microstrip Antenna Using Log-Periodic Array for Bandwidth Enhancement with Inset and Proximity Feed

This study deals with a design and implementation of a microstrip patch antenna array that are feeding by Inset and Proximity methods. Results showed that antenna would have high frequency bandwidth and better impedance matching in Inset feeding. Also in Proximity feeding, unwanted radiation vanished because T-shape connections were eliminated. Simulation and experimental results cleared that antenna in the Proximity method has a smaller size, more gain and better impedance bandwidth than the Inset method. This paper chooses dielectric material FR4 with dielectric substrate permittivity of 4.4 by h=1.6mm. Therefore, operational frequency and input impedance are equal to 3.03 GHz and 50 ohm. Meanwhile, results showed impedance bandwidth and gain increased from 2.7% and 2dB for single arrays to 27.4% and 8dB for 5 arrays.