Open Access
Beam‐steering high‐gain array antenna with FP Bow‐tie slot antenna element for pattern stabilisation
Author(s) -
Rafiei Vahid,
Sharifi Ghader,
Karamzadeh Saeid,
Kartal Mesut
Publication year - 2020
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2019.1071
Subject(s) - antenna measurement , bow tie , coplanar waveguide , antenna array , optics , microstrip antenna , antenna gain , radiation pattern , antenna (radio) , broadband , antenna factor , physics , engineering , microwave , telecommunications
In this work, a beam‐steering array antenna for pattern stabilisation is presented. The antenna element consists of two layers with a unique structure of microstrip to coplanar waveguide (CPW) transition to cover a frequency range from 20 to 30 GHz and a stable pattern at all operating frequencies. To increase the gain of the antenna element, an elliptical broadband Fabry–Perot cavity structure is used. The element manages 3 dB gain bandwidth of almost 23–26 GHz with a 14.4 dBi peak. In addition, a modified Butler matrix consisting of two 90° and two 135° couplers without phase shift section is used to attain a stable pattern. The proposed Butler matrix performs a stationary phase with a phase error of less than ±6° over a frequency band from 21 to 29 GHz. The integration of the proposed element and feed network leads to a beam‐tilting antenna capable of managing its patterns through the input ports in the operating frequency range of 20–29.5 GHz (9.5 GHz) and 20.6–29.6 GHz (9 GHz) for ports 1 and 2, respectively.