The printed antenna is one of the best antenna structures, due to its low cost and compact design. In this paper, we present a new approach to improve the radiation effectiveness and the performance of antennas by miniaturization of the size. Indeed, we have studied the performance of ultra wideband antenna which consists of a ring-shaped patch. This study was made for the whole frequency band of UWB ranging from 2.5GHz to 9.4GHz and the geometry of the antenna and the results were obtained using the simulation software CST Studio microwaves. The detailed design and the results are shown and discussed in this paper.
In this letter, we proposed a comparative study of a rectangular Microstrip patch antenna at Terahertz (THz) frequency ranging from 0.6 to 0.8 THz with and without superstrate. First, the simulation was carried to a simple micro-strip antenna, was then added an upper layer (superstrate) by varying the height to improve impedance matching and optimizing the performance of the antenna. The matching bandwidth and the maximum radiation gain obtained are around 22.47 % (10.43 dBi at 0.6929 THz), respectively. The performance of the dielectric resonator antenna is simulated by electromagnetic simulator CST Microwave Studio.
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