Design and development of patch compensated wideband Vivaldi antenna

Abstract

Design and fabrication of a microstrip feedline-based Vivaldi antenna in the frequency range of 6.0–8.0 GHz have been presented. The Vivaldi antenna is a planar antenna, fabricated at the microstrip feedline by having an exponentially tapered slot profile on it. An optimized computer-aided design has been developed and simulated for the desired radiation parameters like voltage standing wave ratio, bandwidth, directionality, beam-width, etc. The optimized design has been fabricated and tested. Wherever the results are not found as desired; problem has been comprehensively investigated and analyzed. This is found associated with a discontinuity at feed line, fabrication tolerance constraints and parasitic capacitance at the edges or the bent of the microstrip feedline which introduce the parasitic reactance in antenna design. Here, the presented work explores a generalized theoretical procedure for the compensation of associated problem by incorporating the reactive patch on the feedline. The developed theory is applied in fabrication and tested for the desired results.

Binomial stub loaded compact Vivaldi antenna for superwideband applications

“…A comparison of the proposed Vivaldi antenna with the previously reported Vivaldi antennas in [8][9][10][11][12][13] is tabulated in Table 2. It is revealed, that the proposed antenna is compact and has the highest percentage bandwidth of 164%.…”

“…In [12], it is shown that elliptical corrugations on the outer edge of AVA with optimal shaping of the inner edges of the antenna result in good impedance matching. Moreover, a patch compensated wideband Vivaldi antenna is reported in [13].…”

“…In this work, novel impedance matching techniques like binomial tapering of the outer edge, binomial slit loading, and protruded binomial stub loading are incorporated in the conventional antipodal Vivaldi antenna (CAVA) to increase the electrical length and thereby reducing the lower operating frequency. The proposed antenna has a fractional bandwidth of 164% and is compact compared to other related works [8][9][10][11][12][13]. The organization of the paper is as follows.…”