Title :
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
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;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2002. IEEE
Print_ISBN :
0-7803-7330-8
DOI :
10.1109/APS.2002.1016030
