A Bisected Miniaturized ZOR Antenna With Increased Bandwidth and Radiation Efficiency

Author

Shu-Yen Yang ; Ng Mou Kehn, Malcolm

Author_Institution

Dept. of Electr. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan

Volume

12

fYear

2013

fDate

2013

Firstpage

159

Lastpage

162

Abstract

A compact planar, via-free, and bisected zeroth-order resonator (ZOR) antenna based on bisected interdigital capacitor-loaded transmission line (B-CL-TL), with improved bandwidth and higher radiation efficiency is proposed. Strong miniaturization and increase of bandwidth and efficiency are obtained by dissecting the initial design by half without incurring compromise. The antenna consists of two cascaded coplanar interdigital capacitors as series capacitors shorted to the ground plane at one end. A meander-line inductor is implemented for matching. A fabricated prototype has dimensions of 0.11λ₀×0.18λ₀×0.01λ₀ in total size, yielding an omnidirectional far-field pattern, and provides a 135-MHz bandwidth (6.1%) with a measured radiation efficiency of 76.8% at 2.21 GHz.

Keywords

coplanar waveguides; microwave antennas; resonators; bisected miniaturized ZOR antenna; cascaded coplanar interdigital capacitors; frequency 2.21 GHz; interdigital capacitor-loaded transmission line; meander-line inductor; radiation efficiency; zeroth-order resonator antenna; Antenna measurements; Antenna theory; Bandwidth; Capacitors; Frequency measurement; Transmission line antennas; Antenna miniaturization; bandwidth enhancement; interdigital capacitor (IDC); radiation efficiency; zeroth -order resonator (ZOR) antenna;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2013.2243696

Filename

6423203