Title :
A CPW-Fed Octagon-Shaped Aperture Antenna for Lower Band UWB Applications
Author :
Gunavathi, N. ; Pandeeswari, R. ; Raghavan, S.
Author_Institution :
Dept. of Electron. & Commun. Eng., Nat. Inst. of Technol., Tiruchirappalli, India
Abstract :
A compact, CPW-fed octagon shape aperture antenna for lower band UWB applications is presented. The antenna consists of a irregular octagon (polygon with 8 sides) aperture on a printed circuit board, ground plane and a octagon-shaped exciting stub. Initially the proposed antenna is designed with rectangular aperture and then the rectangular shaped aperture is converted into irregular octagon shaped aperture by inserting a isosceles right angled triangular metallic shape in the corners of rectangular aperture to increase the impedance matching in the required bandwidth. The octagon shaped stub and polygon aperture (slot) are simple and has less parameter, which are convenient to optimize. The proposed antenna is designed on an inexpensive FR4-epoxy substrate with dielectric constant ¿r =4.4 and with a size 30 mm × 30 mm × 1.5 mm.The presented antenna has a impedance bandwidth from 2.8 GHz - 4.9 GHz (VSWR<2), gain from 1.5 dBi to 3.9 dBi and directivity from 3.5 dBi to 4.4 dBi.
Keywords :
UHF antennas; antenna feeds; coplanar waveguides; impedance matching; microstrip antennas; microwave antennas; slot antennas; ultra wideband antennas; FR4 epoxy substrate; coplanar waveguide fed octagon shaped aperture antenna; frequency 2.8 GHz to 4.9 GHz; ground plane; impedance matching; lower band UWB applications; octagon shaped exciting stub; printed circuit board; size 1.5 mm; size 30 mm; Aperture antennas; Bandwidth; Coplanar waveguides; Dielectric substrates; Feeds; Geometry; Impedance matching; Interference; Shape; Ultra wideband antennas;
Conference_Titel :
India Conference (INDICON), 2009 Annual IEEE
Conference_Location :
Gujarat
Print_ISBN :
978-1-4244-4858-6
Electronic_ISBN :
978-1-4244-4859-3
DOI :
10.1109/INDCON.2009.5409362
