Low profile circularly polarized side-fed bifilar helix antenna

Author

Iqbal, Sana ; Amin, Muhammad ; Yousaf, Jawad

Author_Institution

Space & Upper Atmos. Res. Comission of Pakistan (SUPARCO), Lahore, Pakistan

fYear

2012

Firstpage

325

Lastpage

328

Abstract

In this paper, a circularly polarized, omnidirectional side-fed bifilar helix antenna, which does not require a ground plane is presented. The antenna has a height of less than 0.1λ and the maximum boresight gain of 1.95dB, with 3dB beamwidth of 93°. The impedance bandwidth of the antenna for VSWR≤2 (with reference to resonant input resistance of 25Ω) is 2.7%. The simulated axial ratio(AR) at the resonant frequency 860MHz is 0.9 ≤AR≤ 1.0 in the whole hemisphere except small region around the nulls. The polarization bandwidth for AR≤3dB is 34.7%. The antenna is especially useful for high speed aerodynamic bodies made of composite materials (such as UAVs) where low profile antennas are essential to reduce air resistance and/or proper metallic ground is not available for monopole-type antenna.

Keywords

antenna feeds; composite materials; helical antennas; monopole antennas; UAV; air resistance reduction; composite materials; frequency 860 MHz; gain 1.95 dB; high speed aerodynamic bodies; impedance bandwidth; low profile circularly polarized antenna; monopole-type antenna; omnidirectional side-fed bifilar helix antenna; polarization bandwidth; proper metallic ground; resistance 25 ohm; resonant frequency; resonant input resistance; simulated axial ratio; Axial ratio (AR); Circular Polarization (CP); omnidirectional antenna;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Sciences and Technology (IBCAST), 2012 9th International Bhurban Conference on

Conference_Location

Islamabad

Print_ISBN

978-1-4577-1928-8

Type

conf

DOI

10.1109/IBCAST.2012.6177572

Filename

6177572