Bandwidth Enhancement of a Microstrip Line-Fed Printed Wide-Slot Antenna With a Parasitic Center Patch

• Published in: IEEE transactions on antennas and propagation Vol. 60; no. 4; pp. 1712 - 1716
• Main Author: Sung, Y.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.04.2012; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna measurements; Antennas; Applied sciences; Bandwidth; Broadband antennas; Exact sciences and technology; Excitation; Microstrip lines; Noise levels; Patch antennas; Radiocommunications; Resonant frequencies; Resonant frequency; Resonators; Sensors; Services and terminals of telecommunications; Slot antennas; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Telemetry. Remote supervision. Telewarning. Remote control; Wide-slot antenna; wideband antenna; Resonator; Range finding; Wide-slot antenna; Non directive antenna; Printed antenna; Broadband antennas; Microstrip line; Wide band; Slot antenna; Resonance frequency; wideband antenna; Radiation pattern; Plane antenna
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2012.2186224

A printed wide-slot antenna with a parasitic patch for bandwidth enhancement is proposed and experimentally investigated. A simple 50-Ω microstrip line is used to excite the slot. A rotated square slot resonator is considered as reference geometry. The rotated square slot antenna exhibits two resonances (f 1 : lower resonant frequency, f 2 : higher resonant frequency). By embedding a parasitic patch into the center of the rotated square slot, the lower resonant frequency is decreased and the higher resonant frequency is increased. Thus, broadband characteristic of the wide-slot antenna is achieved. The measured results demonstrate that this structure exhibits a wide impedance bandwidth, which is over 80% for |S 11 | ≤ -10 dB ranging from 2.23 to 5.35 GHz. Also, a stable and omnidirectional radiation pattern is observed within the operating bandwidth. In this design, a smaller ground plane is considered compared to the reference antenna (rotated square slot antenna without the parasitic center patch).