A Compact Ultra-Wideband Planar Printed Bow-Tie Quasi-Yagi Antenna with Rhombus Director and Tapered CPS Connection Structure

ABSTRACT

A compact ultra-wideband (UWB) planar printed bow-tie quasi-Yagi antenna is proposed and experimentally studied in this paper. It is composed of three wideband configurations: micro-strip-line to slot-line transition structure with a shorting vias (balun), a pair of bow-tie driver, and rhombus director, which aims at breaking the bandwidth limitation of the conventional micro-strip (MS) quasi-Yagi antenna. To further improve the impedance matching, the tapered co-planar strip-line is adopted between the bow-tie driver and the balun as bridge. The overall size of the proposed antenna is only 30 mm × 27 mm. A prototype UWB quasi-Yagi antenna is fabricated and measured to verify the validity of this design. The measured impedance bandwidth, defined by −10 dB reflection coefficient, can reach an operating bandwidth of 101% from 3.62 to 11 GHz, over which the antenna exhibits excellent end-fire radiation with a front-to-back ratio of greater than 19 dB and a moderate gain of better than 3.81 dBi. In contrast to the conventional micro-strip quasi-Yagi antenna design, our proposed antenna features a smaller size and wider −10 dB reflection coefficient bandwidth.

KEYWORDS:

• End-fire antenna
• Quasi-Yagi antenna
• Rhombus director
• Small-size
• Tapered co-planar strip-line (CPS)
• Ultra-wideband (UWB) antenna

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work is supported by the National Natural Science Foundation of China (Youth Project) [grant number 61601074]; the Science and technology research project of Chongqing Municipal Education Committee [grant number KJ1600409]; Doctoral Fund of Chongqing University of Posts and Telecommunications [grant number A2015-08].

Notes on contributors

Ping Wang

Ping Wang was born in Chongqing, China. He received his MS degree in theoretical physics from Chongqing University of China in 2008 and the PhD degree in University of Electronic Science and Technology of China (UESTC) in 2013, respectively. Currently, he is working in Chongqing University of Posts and Telecommunications, China. His current research interests include patch antennas, wide band antennas, and arrays.

E-mail: [email protected]

Zhi-Qiang Cai

Zhi-Qiang Cai , master degree candidate of Chongqing University of Posts and Telecommunications. The main research direction is electromagnetic theory and application in communication.

E-mail: [email protected]