Abstract
In this paper, a wide-band low cross polarization antenna with a structure of microstrip line coupling to slot line as the balun is proposed. The radiation part of the antenna is fed by two pairs of parallel transmission line via a transition from a slot line which is coupled by a microstrip line. Because it is fed by parallel transmission lines, which is balanced-fed structure, the antenna can achieve an improved low cross-polarization performance. The height of the antenna is 0.146λ0 (λ0 is the wavelength of lowest frequency). The prototype antenna demonstrates a measured impedance bandwidth of 93.5% (2.7–7.44 GHz), a 3-dB-gain bandwidth of 77% (2.7–6.1 GHz), and a maximum gain of 10.5 dBi at 4.5 GHz.
Highlights
RESEARCH ARTICLEA broadband and low cross polarization antenna with a balun of microstrip line coupling to slot line
With the great development in wireless communication systems, demanding for antennas with light weight, high performance, low cost and ease manufacture, printed antenna is widely used in various systems
Many unbalanced-balanced transform structures have been proposed in the published literature, microstrip to parallel strip lines, CPW transform to parallel strip line, microstrip line coupled to slot line and so on
Summary
A broadband and low cross polarization antenna with a balun of microstrip line coupling to slot line.
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