Novel Miniaturized Broadband Quasi-Yagi Antennas Based on Modified Bowties Driver for Wireless Technology Applications

Abstract

Abstract-This paper presents two novel miniaturized broadband Quasi-Yagi antennas which adopt compact layouts and two different modified bowties as driven dipoles. In these antennas, the microstrip feed and λ/4 impedance transformer are placed horizontally and rearranged in a same horizontal line with balun to reduce the vertical size. The horizontal size is reduced by loading the vertical metallic strips at the sides of bowtie driven dipole and ground patch. Compared with the conventional QuasiYagi antenna, the sizes of the two proposed antennas are decreased to approximately 50%. The experiment results exhibit that they have wide bandwidths of 2.27-3.35 GHz and 2.14-3.3 GHz for reflection coefficient below −10 dB. Their gains reach 4 dBi over the operation frequency band, which indicate that they can be applied conveniently in wireless communications and recognition fields like WLAN, RFID, WiMAX and LTE frequency bands.

A high‐gain quasi‐Yagi antenna using nested metaresonator structures

“…2,3 General characteristics of the quasi-Yagi antennas can be controlled by modifying the main elements such as the driver, ground, and director of the antenna. [4][5][6][7][8][9][10][11][12][13][14][15][16][17] Apart from forming an array, [18][19][20] quasi-Yagi antenna gain is conventionally enhanced by adding additional director elements. [21][22][23] Other gain enhancement methods typically involve modifying the director element of the quasi-Yagi antenna.…”

“…Among many, quasi‐Yagi antennas, in particular, have grown in popularity due to their desirable features such as high gain, large bandwidth, end‐fire radiation, and compatibility with planar circuitry 2,3 . General characteristics of the quasi‐Yagi antennas can be controlled by modifying the main elements such as the driver, ground, and director of the antenna 4–17 . Apart from forming an array, 18–20 quasi‐Yagi antenna gain is conventionally enhanced by adding additional director elements 21–23 .…”

A miniaturized quasi‐Yagi antenna using defected ground structure and double dog‐bone driver

“…There are a few miniaturized quasi‐Yagi antenna studies in the literature 14–19 . These studies minimize the electrical size by modifying the quasi‐Yagi antennas' driver and ground plane.…”

“…As a result, the antenna's lower frequency was reduced; thus, a small miniaturization effect was obtained. In Reference, 16 a horizontal feeding mechanism was proposed to reduce the vertical size of the antenna, where an antenna size of was obtained. However, this antenna has a complex balun structure.…”

Compact wideband tapered‐fed printed bow‐tie antenna with rectangular edge extension

“…According to the needs of these specific applications, performances of PBAs have been tried to be improved. There are many useful methodologies such as implementations of metamaterials, feeding line modifications, employment of slots, different ground plane variations, matching stubs and lumped elements, fractal and array structures, parasitic directors, reflectors and additional bow extensions are suggested in order to improve the performances of PBA in terms of radiation pattern, gain, and bandwidth. However, relatively smaller structures have comparably narrower bandwidths while the ones with relatively wider bandwidth have larger dimensions .…”