Investigation of Taper Profile in Development of Compact Tapered Slot Microstrip Antennas for X-Band SATCOM Applications
Seyfettin Sinan Gultekin
In this paper, four novel wide-band dual tapered slot (DTS) microstrip antennas (MSAs) are proposed for X-Band Satellite Communications (SATCOM) applications. Three of them have stripline feeds between SMA connector and tapering profile, whereas the fourth one omits the stripline feed. Each antenna consists of two microstrip lines on each side of an FR-4 substrate, fed with a coaxial connector from one face. Towards the edges, the distance between conductors is increasing gradually. The aim of this study is to design receiver antennas capable of operating in X-Band Satellite Communications (7250-7750 MHz) range and investigate the effects of tapering profiles on the performance. For this purpose, each antenna is defined in terms of parameters, and the optimum values for all parameters are calculated using High Frequency Structure Simulator (HFSS) software. The antennas are simulated and practically fabricated. Results show good agreement between simulations and measurements. The antennas have impedance bandwidth of 380 MHz centered at 7448 MHz for dual linearly tapering, 540 MHz centered at 7434 MHz for dual circularly tapering, 900 MHz centered at 7555 MHz for dual exponentially tapering, within the aimed Super High Frequency (SHF) range. Also, the designed fourth antenna having dual circularly tapering without the stripline feed has a bandwidth of 1150 MHz centered at 7676 MHz. It is proposed that taper profile affects bandwidth, gain, radiation efficiency, radiation pattern and antenna dimensions.