Bandwidth Enhancement of Low-Profile PEC-Backed Equiangular Spiral Antennas Incorporating Metallic Posts

Author

Veysi, Mehdi ; Kamyab, M.

Author_Institution

Electr. Eng. Fac., K. N Toosi Univ. of Technol. (KNTU), Tehran, Iran

Volume

59

Issue

11

fYear

2011

Firstpage

4315

Lastpage

4318

Abstract

This communication examines parasitic coupling to achieve higher bandwidth (BW) and further size reduction for low-profile PEC-backed equiangular spiral antennas. The parasitic loading is realized by metallic posts placed between the antenna plane and metal reflector. The parasitically excited metallic posts can considerably improve the antenna axial ratio at low frequencies as well as make it more rigid in construction. However, in practical applications, the low-profile equiangular spirals, albeit compact, suffer from the lack of a proper planar feed. To obviate this problem, a planar spiral-shaped microstrip feed is proposed.

Keywords

antenna feeds; microstrip antennas; planar antennas; spiral antennas; antenna axial ratio; antenna plane; bandwidth enhancement; low-profile PEC-backed equiangular spiral antennas; metal reflector; metallic posts; parasitic coupling; parasitic loading; planar spiral-shaped microstrip feed; size reduction; Antenna measurements; Antenna radiation patterns; Feeds; Microstrip; Microstrip antennas; Spirals; Equiangular spiral antenna (ESA); freestanding equiangular spiral antenna (FESA);

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2011.2164194

Filename

5979200