On the Miniaturization of Microstrip Ring-Hybrid Couplers Using Gielis Supershapes

Abstract

The design, development and fabrication of compact microstrip ring-hybrid couplers are presented in the present paper. In order to obtain miniaturization, λ/4 microstrip lines in a conventional microstrip ring-hybrid are equivalently substituted with quarter-wavelength supershape transmission lines. The results show that almost 74% size reduction can be achieved as compared to a conventional ring-hybrid. For verification purpose, a sample prototype has been designed, manufactured and tested. The fabricated compact ring-hybrid coupler operates at 1.3 GHz with low amplitude and phase imbalances. The acceptable agreement between the measurement and stimulation results validates the performance of presented coupler. The proposed ring-hybrid is compact, simple, single layer, cheap and suitable for planar fabrication for utilizing in modern communication systems.

KEYWORDS:

• Ring-hybrid coupler
• Miniaturization
• Microstrip
• Superformula

Additional information

Notes on contributors

Azam Tayebi

Azam Tayebi was born in Kashan, Iran, in 1994. She received the BSc degree in electrical engineering from the University of Kashan, Kashan, Iran, in 2016. She is currently pursuing the MSc degree in electrical engineering with the University of Kashan, Iran. Her current research interests include design of antenna and microwave components. Email: [email protected]

Davoud Zarifi

Davoud Zarifi was born in Kashan, Iran, in 1987. He received the BS degree from the University of Kashan, Kashan, Iran, in 2009, the MS degree from the Iran University of Science and Technology (IUST), Tehran, Iran, in 2011, and the PhD degree from the IUST in 2015, all in electrical engineering. Presently, he is an assistant professor in the School of Electrical and Computer Engineering, University of Kashan, Kashan, Iran. His research interests are electromagnetic waves in complex media, numerical techniques for electromagnetics, design of microwave components, slot array antennas and gap waveguide technology. Corresponding author. Email: [email protected]