Antenna Bandwidth Improvement by Using Indirect Coaxial Probe Feeding Method

Abstract

Microstrip patch antennas are widely used because of their many advantages, such as the low profile, light weight, and conformity. However, patch antennas have a main disadvantage which is the narrow bandwidth. Researchers have made many efforts to overcome this problem and many configurations have been presented to broaden the bandwidth. Certain techniques for enhancing the bandwidth of microstrip antennas have already been developed, e.g., parasitic patch either in stacked or coplanar geometries, U-slot patch, L-probe coupling, aperture coupling and increasing the thickness of the antenna. The goal of this research is to improve the return loss bandwidth by using different feeding techniques. This technique will be tested for various planner antenna types such as microstrip antenna and Planar Inverted F Antenna (PIFA). The research will consider the antenna and its feeder in two modes. The first one will consider them as the one part and the second will separate them in treatment. Indirect Probe Feeding gains large band of impedance resonance obtained by adjusting the capacitance and the inductance of feeder part.