Design and Analysis of Microstrip Bi-Yagi and Quad-Yagi Antenna Arrays for WLAN Applications

Abstract

Abstract-In this letter, the design of a microstrip bi-Yagi and microstrip quad-Yagi array antenna is presented. These designs are a derivative of the original microstrip Yagi antenna array and can achieve a high gain and a high front-to-back (F/B) ratio in comparison to the conventional microstrip Yagi structure first proposed by Huang in 1989. The proposed bi-Yagi and quad-Yagi antenna arrays can also achieve a higher gain (3-6 dB) than the conventional microstrip Yagi array. Simple fabrication techniques can be used with these designs due to the placement of the feeding network on the same layer with the antenna elements. Furthermore, simulations and measurements demonstrate with very good agreement that the proposed arrays can achieve a gain as high as 15.6 dBi (compared to a gain of 10.7 dBi that is achieved by the microstrip Yagi antenna array) while maintaining an F/B ratio that is relatively high.Index Terms-Bi-/quad-Yagi array, capacitive coupling, frontto-back ratio, microstrip Yagi antenna array, quasi-endfire.

Half-Mode Substrate Integrated Waveguide Yagi Array with Low Cross Polarization

“…Like other Yagi antennas and arrays [1][2][3][4][5][6][7][8][9][10], all the presented Yagi antenna and arrays in our work have the tilted beam. Usually, an effective method to adjust the beam steering angle is to change the number of director element according to the principle of field superposition.…”

“…Based on these antennas, many microstrip Yagi arrays have been developed to extend the performance. By duplicating the microstrip Yagi antenna perpendicular to the projective direction of the tilted beam, linear arrays would be obtained [5][6][7]. This method of array arrangement is mainly used to achieve a high gain greater than 10 dBi.…”

Diversity and Directivity Mode-Switchable Planar Antenna Array

“…위에서 언급한 무선 통신 환경과는 다르게 환경에 방해 받지 않는 직선거리 (line of sight)의 통신환경에서는 지향성 안테나가 요 구된다. 지향성 안테나로써 Yagi-Uda 안테나, logperiodic 안테나, corner reflector 안테나 등이 있으 며, 그 중에서 Yagi-Uda 안테나 기술이 현재까지도 가장 많이 알려져 있으며, 많은 연구가 이루어지고 있다 [7]～ [9] . 이다.…”

A High Gain Double-Octagon Fractal Microstrip Yagi Antenna

“…Dejean et al [9] introduced two new microstrip Yagi antenna arrays in which one of them was called bi-Yagi. The measurement results showed that bi-Yagi has capability to produce a maximum gain of 13.3 dB with the antenna size of 115.8 mm × 137.1 mm.…”