Broadband Gap-Coupled Assembly of Patches Forming Elliptical Microstrip Patch Antenna for C- Band Applications

Abstract: The radiation performance of a compact gap-coupled assembly of patches forming the geometry of elliptical patch antenna is simulated using glass epoxy FR4 substrate material. This assembly is achieved by cutting conventional elliptical patch antenna geometry into four independent patches through three narrow slits parallel to the minor axis of elliptical patch. So the elliptical patch is divided into four independent patches out of which two outer patches and two inner are identical in shape and size. The part of the inner patch in the first quadrant is exited through inset feed, and the three other patches are gap coupled to this patch. This arrangement of antenna elements resonate at the frequency 6.2GHz. This arrangement gives an improved bandwidth (~20%). The radiation pattern of antenna at resonant frequency is almost identical in shape and nature. Details of the antenna design and simulated results are presented and discussed systematically. The simulated result shows that the antenna is resonating at frequency 6.2GHz. This antenna successfully achieves the bandwidth of 19.9% (at VSWR: 1.15) and suitable for C- band applications.

Keywords: Microstrip antenna, gap-coupled antenna, elliptical patch antenna.