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Title: Differential-fed wang-shaped patch antenna using narrowband and wideband baluns
Authors: Chung, KL
Wong, CH
Keywords: Baluns
Microstrip antennas
Issue Date: 2010
Publisher: IEEE
Source: 2010 IEEE Antennas and Propagation Society International Symposium (APSURSI), 11-17 July 2010, Toronto, ON, p. 1-4 How to cite?
Abstract: The rapid growth of wireless communications has demanded technology development in addressing the narrow bandwidth of microstrip patch antennas. Various impedance bandwidth broadening techniques such as U-slotted patch [1], E-shaped patch [2]-[3], suspended patch [4], and L-shaped probe feed [5]-[6] have been invented to overcome the impedance matching and bandwidth issues. Nevertheless, wide impedance bandwidths are often accomplished at the cost of distorted copolarized (Co-pol) radiation patterns and high cross-polarization (X-pol) levels within the achieved impedance bandwidth, which in turn leads to a narrow operating bandwidth. Recently, the novel differential-fed wideband patch antennas featuring symmetrical, non-distorted radiation patterns with low X-pol levels have been proposed [7]-[9], one of them is known as the Wang-shaped patch antenna [8]-[9]. The innovation of the Wang-shape comes from the disadvantages of the E-shaped patch which is inherently asymmetric in one plane and produces high X-pol off boresight. Moreover, when the feed mechanism of wideband patch antennas involves a vertical probe, the used air/foam substrate is found to be limited at -0.1 operation wavelength (λ) in height [l]-[5]. This paper presents a novel differential L-probe fed Wang-shaped patch antenna with the use of an air substrate that goes beyond 0.2λ. High-order modes and cross-polarization levels are suppressed to minimum by separately using two different feeding networks: a narrowband and a wideband balun. The operating bandwidths of the two antennas are 30% and 40% at 2 GHz, in which the X-pol levels are suppressed below -17dB and -20 dB, respectively.
ISBN: 978-1-4244-4967-5
ISSN: 1522-3965
DOI: 10.1109/APS.2010.5562087
Appears in Collections:Conference Paper

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