Design of Wideband Multi-Ring Microstrip Antennas Fed by an L-Probe for Single-Band and Dual-Band Operations

• Published in: 2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting pp. 541 - 542
• Main Authors: Kimura, Yuki, Furukawa, Kohei, Saito, Sakuyoshi, Kimura, Yuichi, Fukunaga, Tatsuya
• Format: Conference Proceeding
• Language: English
• Published: IEEE 05-07-2020
• Subjects: Antenna measurements; Broadband antennas; Dual band; L-probe; Microstrip; Microstrip antennas; multi-ring microstrip antenna; multiband; planar antenna; Substrates; Wideband
• ISSN: 1947-1491
• DOI: 10.1109/IEEECONF35879.2020.9329487

This paper presents design of a wideband multi-ring microstrip antenna fed by an L-probe for single-band and dual-band operations. The proposed antenna consists of one or two square ring patches and an L-probe arranged in a multilayered dielectric substrate. By using a thick substrate for the L-probe and optimizing distances between the L-probe and the patches, wideband performance can be obtained. Prototype antennas for single-band and dual-band operations are fabricated and tested. Measured fractional reflection bandwidths less than −10 dB are 46.1% for the single-band antenna and 20.3% and 15.7% for the dual-band antenna, respectively. Measured gains of the test antennas in the above bandwidths are 0 to 6.9 dBi for the single-band antenna and 3.0 to 8.6 dBi for the dual-band antenna, respectively. Although the E-plane radiation pattern is slightly tilted against the frequency, stable broadside radiation is confirmed. The proposed antennas exhibit excellent performance as wideband planar antennas for single-band and dual-band operations. The proposed wideband antenna can be easily extended to a dual linearly-polarized antenna by using another L-probe at the orthogonal position.