Patch antenna bandwidth increase by means of a director

Design of miniaturized fractal antenna

“…Several technical papers have appeared to improve the bandwidth of microstrip antenna [2][3][4]. The bandwidth of microstrip antenna increases with increasing the thickness of the substrate and lowering the dielectric constant.…”

“…The bandwidth of microstrip antenna increases with increasing the thickness of the substrate and lowering the dielectric constant. Using the coupling resonant antenna is also the strong technique to increase the bandwidth of microstrip antenna [3]. Although bandwidth of microstrip antenna can be increased by several techniques but the size of microstrip antenna is limited by the half wavelength length for good radiation efficiency.…”

Dual‐frequency and dual‐polarization multilayer microstrip antenna element

“…Triangular resonators were originally introduced by Jhelszajn and P. S. James [4]. Jia-Sheng Hong [5] and B. Strassner [6] reported a development of microstrip triangularpatch resonator filters, in which one transmission zero can be implemented. However, to improve the selectivity and efficiency of spectrum utilization, filters with two or more transmission zeros have been in demand.…”

“…Advanced filtering characteristics with transmission zeros are desirable for improving the selectivity, sensitivity, and efficiency of spectrum utilization. However, the high stopband in [6] did not have transmission zeros, and only one transmission zero was reported in both [5] and [6]. In order to conveniently integrate microstrip filters in the front-end part of communication systems, their dimensions must be considerably reduced.…”

Input impedance of double patch antenna

“…They are of interest in many applications such as airplanes , satellites, missiles, etc [l-31. The bandwidth of a microstrip antenna can be increased by overlaying a parasitic element[4-51. The quasi-TEM transmission line model is used to explain the impedance bandwidth behaviour of the quadratic microstrip antenna with different size of parasitic eIement [4]. The result is far from satisfactoIy.…”