Effect of U-Slot Length Variations on the Performance of Stacked Microstrip Antenna

Abstract

Antenna miniaturization plays an important role in the design of modern personal wireless systems. Several minimization techniques have been known for a long time. The mail minimization tools are loading the antenna with lumped elements, high permittivity dielectric materials or conducting additions; using a ground plane with short circuits and optimizing the geometry. In this paper, a compact stacked microstrip antenna with loaded U‐slot on the driven (lower) patch and probe feed structure is proposed. The purpose of this paper is to study the variations of a U‐slot length with the parameters of stacked microstrip antenna such as input impedance, bandwidth and resonant frequency etc. The paper emphasizes the significant change observed in the performance of compact stacked microstrip antenna. Earlier work has utilized a U‐slot on the planar microstrip antenna and the effect of slot width on performance of microstrip antenna is studied. The software package IE3D® version 11.5 was used to simulate the antenna structures. The simulation results show that, the size reduction is achieved by inserting U‐slot in the radiating element. Further, it is observed from the simulation that maximum overall impedance bandwidth is achieved for width of U‐slot LS = 22 mm, which is 277.78 MHz. This developed microstrip antenna is small enough to be easily accommodated in wireless applications.