X-Band Multilayer Stacked Microstrip Antenna Using Novel Electromagnetic Band-Gap Structures

Abstract

In this work, a multi-layered rectangular microstrip antenna, with an inset feeding technique, is designed. It consists of a 10 GHz resonating conventional microstrip patch and a novel 9 × 9 electromagnetic bandgap (EBG) array printed on a 0.5 mm thin FR-4 epoxy as superstrate; an air-spacer separated both. The top radiating patch is magnetically coupled with the bottom radiator such that it also radiates. The bottom dielectric layer’s other side is finished with the perfect ground for minimizing the back-lobe radiation. The dimensional parameters are optimized for both patch and the EBG surface in the Finite Element Method (FEM)-based EM solver ANSYS HFSS. The superimposition of the top EBG surface improves the gain without degrading the performance of the lower patch. This antenna has a −10 dB reflection bandwidth of 1.2 GHz with −30.57 dB minimum reflectivity at 9.9 GHz (better VSWR). The proposed prototype offers a gain of 9.45 dBi in both E and H planes. Finally, the device is fabricated using the conventional PCB technology. The performances of the device, like gain and radiation pattern, are measured in the anechoic chamber. It is found that the simulation and measured results are in near agreement. The physical dimensions of the proposed antenna are 55 mm × 55 mm × 17.67 mm.

Keywords:

• Antenna
• Electromagnetic bandgap (EBG)
• Gain
• Multilayer

Additional information

Notes on contributors

Mohit Gaharwar

Mohit Gaharwar is presently working as associate professor and HOD (E&C and EE Department) at Sachdeva Institute of Technology, Farah, Mathura (U.P). He obtained BE from FET RBS College Agra, MTech from IET Khandari Agra in microwave and radar engineering and pursuing PhD from AKTU Lucknow. His research interests include microwave engineering and antennas. He has published more than 15 research papers in national, international journals and conferences and also guided master’s dissertations. He is also life member of ISIAM.

D. C. Dhubkarya

D C Dhubkarya is working as associate professor in the Department of Electronics and Communication Engineering at Bundelkhand Institute of Engineering & Technology, Jhansi, India. He received the BE (Electronics Engg) degree from Jiwaji University, Gwalior, India in 1990, MTech (Microwave and Radar) degree from IIT Roorkee, India in 2001 and PhD (Electronics Engg) degree from Bundelkhand University Jhansi, India in 2009. He was positioned as Scientist B at CEERI, Pilani, Rajasthan, India from 15 January 1992 to 27 May 1996. His research interest includes microwave engineering and antenna design. He has over 70 research papers published in national and international journals/conferences and guided number of doctorate and Master’s scholars in their research work. He also has number of books published under his name. He is Life member of ISPA New Delhi, Institute Member of ISTE. New Delhi and Associate Member of IETE New Delhi. E-mail: [email protected]