Enhanced Bandwidth Artificial Magnetic Ground Plane for Low-Profile Antennas

Author

Yousefi, Leila ; Mohajer-Iravani, Baharak ; Ramahi, Omar M.

Author_Institution

Waterloo Univ., Waterloo

Volume

6

fYear

2007

fDate

6/29/1905 12:00:00 AM

Firstpage

289

Lastpage

292

Abstract

In this letter, it is shown that using magneto-dielectric materials as substrate can increase the in-phase reflection bandwidth of electromagnetic bandgap (EBG) structures. To show this, a compact wideband EBG structure is designed and simulated. The numerical results show that this EBG has an in-phase reflection bandwidth of 70% which is several times greater than a conventional EBG resonating at the same frequency. Additionally, the new EBG surface has a smaller cell size, an important feature in the design of small antennas. As a demonstration of the effectiveness of the new structure, a low-profile unidirectional spiral antenna is designed to operate from 8 to 18 GHz. The improvement in the voltage standing wave ratio (VSWR) and gain of this antenna is presented while comparison is made to the case when using conventional EBG surface.

Keywords

dielectric materials; magnetic materials; microwave antennas; photonic band gap; spiral antennas; substrates; EBG surface; VSWR; artificial magnetic ground plane; compact wideband structure; electromagnetic bandgap structures; enhanced bandwidth; frequency 8 GHz to 18 GHz; in-phase reflection bandwidth; low-profile antennas; magneto-dielectric materials; perfect magnetic conductor; unidirectional spiral antenna; voltage standing ratio; Bandwidth; Dielectric substrates; Electromagnetic reflection; Frequency; Magnetic materials; Metamaterials; Periodic structures; Spirals; Voltage; Wideband; Electromagnetic band-gap (EBG) structure; magneto-dielectric materials; perfect magnetic conductor (PMC);

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2007.895282

Filename

4265590