A Novel Miniaturized Vivaldi Antenna for Ultra-Wideband Applications

Abstract

Abstract-A novel Vivaldi antenna utilizing a tapered slot edge with a stepped structure (TSESS) to achieve miniaturization is presented in this paper. Compared with a conventional Vivaldi antenna of the same size, the proposed TSESS significantly extends the low-end bandwidth limitation and also improves the low-end antenna gain and radiation characteristics. The proposed antenna is fabricated and tested for validating the reliability of the design. The measured results show reasonable agreement with simulated ones. Moreover, a good time-domain response is indicated from the measured group delay, showing that the antenna meets the requirements of a UWB system.

Compact Wideband Tapered Slot Antenna Using Fan-Shaped and Stepped Structures for Chipless Radio-Frequency-Identification Sensor Tag Applications

“…We can see that the frequency bandwidth of the proposed compact wideband TSA using the fan-shaped and stepped structures is the largest among the antennas except [ 14 , 17 , 19 , 24 , 27 ], but the electrical dimensions considering the lower limit frequency are smaller than these. In addition, the electrical dimensions of the proposed TSA are the smallest among the antennas except [ 14 , 16 , 23 , 29 ], but the lowest gain is larger compared to them. In this regard, tradeoff between the lowest gain in the band and impedance frequency bandwidth must be necessary for designing the compact TSA considering minimum antenna size.…”

“…This section deals with a method of combining the fan-shaped structures and a stepped structure to further decrease the size of the TSA. An attempt to miniaturize the TSA by combining the quarter circular slots and a stepped structure has been studied in [ 16 ]. For further miniaturization, we investigated appending the half circular slots and half circular patches on the stepped structure.…”

“…A pair of quarter circular slots and nonuniform corrugations were added on the sides of the ground conductor of an elliptical TSA to cover a frequency band of 3.1–10.6 GHz, but the antenna performance was similar to the TSA with the triangular slot and corrugations [ 15 ]. A miniaturized TSA with a combination of quarter circular slots and stepped structures for further size reduction was proposed to cover 2.35–11 GHz [ 16 ]. However, the frequency bandwidth might be extended by using curved structures instead of linear structures.…”

A novel offset feed flared monopole quasi‐Yagi high directional UWB antenna

“…In many UWB applications like ground penetrating radars, radar imaging technologies, vehicular radars, wireless-body area network, wireless-personal area networks, through wall radar imaging trends, surveillance systems, medical imaging systems, wireless telemetries and telemedicine trends 3,4 require compact planar high directional UWB antennas. The literature about the UWB antennas [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] is very vast and always fascinating with the novel structures. They include planar monopole antennas, Vivaldis, planar Yagi-Uda antennas, and so on.…”

“…The patch antennas can exhibit directional properties by employing Vivaldi structures, Yagi-Uda configurations and defected ground structures with specially designed ground planes. 4,[9][10][11][12][13][14][15][16][17][18][19][20] In the literature Vivaldis, 8,11 planar quasi Yagi-Udas, [12][13][14][15] and defected ground structures 6 are studied. Different literature papers are taken into the consideration in order to find the optimized structure to form the high directional UWB antenna.…”