A dual band circularly polarized microstrip antenna on an EBG substrate

Author

Sudha, T ; Vedavathy, T.S.

Author_Institution

Dept. of Electr. Commun. Eng., Indian Inst. of Sci., Bangalore, India

Volume

2

fYear

2002

fDate

2002

Firstpage

68

Abstract

A common property of microstrip antennas is that the antenna element launches surface wave modes in addition to the radiated fields. Suppression or reduction of surface waves improves antenna efficiency and reduces side lobe levels. EBG materials, also known as photonic crystals, can offer a solution to the surface wave problem. A novel circularly polarized (CP), single-fed microstrip antenna on an electromagnetic bandgap (EBG) substrate is presented. The antenna consists of a stacked structure of almost square patches and an EBG substrate for the lower patch. The proposed design has a reduced antenna size as compared to the conventional CP microstrip antenna at a given operating frequency and is of light weight. The impedance and axial ratio bandwidths are large and CP radiation quality is excellent over the entire upper hemisphere. The antenna features about 11 dBi gain. The proposed antenna is suitable for Global Positioning System (GPS) applications.

Keywords

antenna radiation patterns; electric impedance; electromagnetic wave polarisation; microstrip antennas; multifrequency antennas; photonic crystals; substrates; EBG substrate; GPS; Global Positioning System; axial ratio bandwidth; circularly polarized antenna; dual band antenna; electromagnetic bandgap substrate; impedance bandwidth; microstrip antenna; radiation patterns; stacked structure; Crystalline materials; Dual band; Electromagnetic wave polarization; Frequency; Global Positioning System; Metamaterials; Microstrip antennas; Periodic structures; Photonic crystals; Surface waves;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium, 2002. IEEE

Print_ISBN

0-7803-7330-8

Type

conf

DOI

10.1109/APS.2002.1016030

Filename

1016030