An open-slot antenna for multi-system integration utilizing inverted-L slit and inverted-C coupling strip

ABSTRACT

This article presents a microstrip broadband open-slot antenna with linear polarization and circular polarization (CP) for integration with multiple commercial wireless communication systems. Two open slots are etched in the ground plane and applied as radiator elements. By utilizing a T-shaped feeding stub, the inductive reactance of the prototype antenna is compensated by a capacitive loading. Additionally, etching an inverted-L slit in the top segment of the ground plane brings about CP at 2.33 GHz. To enhance impedance-matching condition in the middle frequency band, an inverted-C coupling strip is embedded in the dominant open-slot radiator. This technique also generates a new resonance at 5.3 GHz. The proposed antenna can be a candidate of the radiator for long term evolution applications or wireless communication systems with linear and CPs.

KEYWORDS:

• Open slot
• circular polarization
• satellite digital audio radio service system
• coupling strip

ORCID

Chien-Jen Wang http://orcid.org/0000-0002-8111-4813

Additional information

Funding

This work was supported by Ministry of Science and Technology, Taiwan [grant number 106-2221-E-024-001].

Notes on contributors

Chien-Jen Wang

Chien-Jen Wang received a B.S. degree in electrical engineering from the National Sun-Yet-Sen University, Kaohsiung, Taiwan, in 1993 and a Ph.D. degree from the National Chiao-Tung University, Hsinchu, Taiwan, in 2000. From 1993 to 1995, he worked as the platoon leader of a second lieutenant when he served in the ROC Army. In 1998, he was a Microwave Engineer with Industrial Technology Research Institute (ITRI), Hsinchu, Taiwan. In 2000, he joined the Wireless Communication BU, BenQ Corporation, Taipei, Taiwan, as a Project Researcher, where he developed built-in antennas for handsets. In 2001, he joined the Department of Electrical Engineering, Feng-Chia University, Taichung, Taiwan, as an Assistant Professor and an Associate Professor in 2004. In 2006, he joined the Department of Electrical Engineering, National University of Tainan, Tainan, Taiwan, as an Associate Professor, and became a Professor in 2009. Currently, his research activities involve the design of RF/microwave circuits and antennas for mobile communication systems. He has published more than 160 technical papers in international journals and conference proceedings.

Kuan-Wei Li

Kuan-Wei Li was born in Kaohsiung, Taiwan, in 1992. He received a B.S. degree from the Department of Telecommunication Engineering in 2015 and is currently working toward an M. S. degree in electrical engineering at the National University of Tainan, Tainan, Taiwan. His research interests include design of microstrip antennas.