Compact high-isolation self-diplexing antenna based on SIW for C-band applications

ABSTRACT

This paper presents a novel compact high-isolation cavity-backed inverted U-shaped slot antenna using substrate-integrated waveguide (SIW) for C-band applications. The SIW cavity is loaded by an inverted U-shaped slot that produces two fictitious aperture for radiation at two distinct frequency bands and to exhibit self-diplexing antenna (SDA) characteristics. Two orthogonal microstrip feed lines are applied for excitation of fundamental mode ($T{E}_{110}$) and two degenerated modes ($T{E}_{120}$ and $T{E}_{210}$). The perturbation of these modes due to slot loading allows to achieve size miniaturization. Compared with conventional SIW cavity without slot, the proposed SDA allows a size reduction of 56%. High isolation is achieved due to the transmission zeros produced by these modes and orthogonal feed lines. This isolation is further improved (>40.5 and >32.8 dB) due to off-centered input ports that creates very weak cross-coupling path between them. The resonating frequencies of the proposed SDA can be designed individually. Finally, an SDA working at 4.29 and 7.52 GHz is fabricated for validation of simulated performances. The measured gains of the fabricated SDA are 5.38 and 5.82 dBi at the resonating frequencies of 4.29 and 7.52 GHz, respectively. A good consistency is found between measured and simulated results.

KEYWORDS:

• Substrate-integrated waveguide
• self-diplexing antenna
• U-shaped slot
• isolation

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

R. K. Barik  http://orcid.org/0000-0001-7691-2485

Q. S. Cheng  http://orcid.org/0000-0003-3869-3378

Additional information

Funding

This work is supported by the National Natural Science Foundation of China [grant number 61471258]; Science & Technology Innovation Committee of Shenzhen Municipality [grant number KQJSCX20170328153625183].

Notes on contributors

R. K. Barik

Rusan Kumar Barik received the B.Tech degree in Electronic & Communication Engineering from Biju Patnaik University of Technology, Rourkela, India in 2012, M.Tech degree in Communication Systems Design and Ph.D. degree in Electronics Engineering from Indian Institute of Information Technology, Chennai, Tamil Nadu, India in 2015 and 2018, respectively. He joined the Department of Electronic & Communication Engineering, Christ University Bangalore, India, as an assistant professor in 2018. He is currently a Post-Doctoral Researcher with the Southern University of Science and Technology, Shenzhen, China. His research interests include multiband microwave passive devices, multiband antennas, and SIW components.

Q. S. Cheng

Qingsha S. Cheng received the B.Eng. and M.Eng. degrees from Chongqing University, Chongqing, China, in 1995 and 1998, respectively, and the Ph.D. degree from McMaster University, Hamilton, ON, Canada, in 2004. In 1998, he joined the Department of Computer Science and Technology, Peking University, Beijing, China. In 1999, he joined the Department of Electrical and Computer Engineering, McMaster University, where he worked as a postdoctoral fellow, a research associate, and a research engineer. He is currently an Assistant Professor with the Department of Electrical and Electric Engineering, Southern University of Science and Technology, Shenzhen, China. His research interests include surrogate modeling, CAD, modeling of microwave circuits, software design technology, and methodologies for microwave CAD.

S. K. K. Dash

Sounik Kiran Kumar Dash was born in Odisha, India. He received his B.Tech degree in the stream of Electronics & Communication Engineering from Centurion University of Technology and Management, Bhubaneswar, India in 2013, M.Tech degree with specialization of Communication System Engineering from KIIT University, Bhubaneswar, India in 2015, and PhD from National Institute of Technology (NIT) Silchar, India in 2018. Currently he is working as a Post-Doctoral Researcher in the Department of Electrical and Electronic Engineering, at Southern University of Science and Technology (SUSTech), Shenzhen, China. His current research interests include Dielectric Resonator Antennas (DRAs), substrate-integrated waveguide (SIW) based antennas, UWB Antennas, MIMO Antennas.

N. C. Pradhan

Nrusingha Charan Pradhan received the B.Tech. degree from Biju Patnaik University of Technology, India, in 2013, and the M.Tech degree in electronics engineering from Pondicherry Central University, Puducherry, India, in 2016. He was with the Integrated Test Range, Defence Research and Development Organisation, Chandipur, India (DRDO-ITR) for a period of two year. He is currently a Research Scholar with the Department of Electronics and Communication Engineering, National Institute of Technology, Tiruchirappalli, India. He has three technical papers. His current research interests include microwave integrated circuits, Substrate Integrated Wave Guide Components for Millimeter Wave Applications. Mr. Pradhan is a Student Member of the IEEE AP Society, the MTT Society.

S. S. Karthikeyan

Karthikeyan Sholampettai Subramanian received the Ph.D. degree from IIT Guwahati, India, in 2011. He has 13 years of educational activity and research experience in the area of RF and microwave. He was the Short-Term academic foreign visit U.K and France. He is currently Assistant Professor with the Department of Electronics and Communication Engineering, National Institute of Technology, Tiruchirappalli, India. He has authored or co-authored more than 100 scientific research papers and technical reports. His current research interests include microwave integrated circuits, biological effects of microwaves, computer-aided design of MICS, metamaterials/frequency selective surfaces (FSSs), fractal antennas, MIC antennas, metamaterial antennas, and substrate-integrated waveguides. Dr Karthikeyan is a Chair of the IEEE-APS Society Madras chapter. He is a member of the IEEE, IEEE MTT-S, and IEEE AP-S. He is a Life Member of the ISTE.