Vertically Polarized Broadband Gain Stable Yagi- Uda Antenna for Millimeter-Wave Applications

• Published in: IEEE antennas and wireless propagation letters 2023-02, Vol.22 (2), p.223-227
• Main Authors: Moudjari, Khadidja, Tellache, Mohamed, Zerfaine, Abdelkader, Djerafi, Tarek
• Format: Article
• Language: English
• Subjects: Antenna arrays; Antenna measurements; Antennas; Bandwidth; Broadband; Broadband antennas; Conductors; Endfire; Frequency measurement; Gain; Millimeter waves; millimeter-wave (mm-wave); monopole antenna; Monopole antennas; Monopoles; Parasitic elements (antennas); strip; Substrate integrated waveguides; substrate-integrated waveguide (SIW); three-dimensional (3-D) transition; Vertical polarization; Yagi antennas; Yagi–Uda antenna
• ISSN: 1536-1225; 1548-5757
• DOI: 10.1109/LAWP.2022.3202650

A millimeter-wave endfire Yagi-Uda antenna based on a monopole fed by a substrate-integrated waveguide (SIW) line is presented in this letter. The antenna consists of two substrates assembled perpendicularly in a 3-D configuration. The vertical plane supports the driven monopole antenna and a group of passive parasitic monopoles, all printed as conductor strips. The horizontal layer contains the SIW feeding line, where the top metallic face acts as a mirror for the monopoles. According to the beam direction and the achieved gain, a parametric study is conducted to determine the number of elements. Two versions are proposed, studied, and experimentally validated. The first version with one arm achieved a -10 dB impedance bandwidth of 23.5% (27.4-34.7 GHz) with a peak gain of 13.8 dBi. The second version with three arms of directors is proposed to achieve a stable gain of 15.1 \pm 0.5 dBi over 16% (27.1-32 GHz). The performance of the proposed antenna with relatively compact size makes it suitable for millimeter-wave systems.