Wideband Omnidirectional Printed Dipole Antenna With Coupling Feed for Wireless Communication Applications

Abstract

Abstract-The wideband and omnidirectional performance of a printed dipole antenna with a novel coupling feed structure is presented. Besides using printed dipole for omnidirectional radiation patterns, the coupling feed structure, which includes the transmission line coupling to a slot line to effectively improve the impedance matching, can be used for bandwidth enhancement. A wideband impedance characteristic of about 45.6% for VSWR ≤ 2 ranging from 1.54 to 2.45 GHz is obtained. The omnidirectional radiation patterns in the whole operation bands are achieved which the un-roundness in H-plane is less than 1.6 dB. It is sufficient for accommodating recent wireless communication services such as DCS1800, PCS1900, UMTS, IMT2000, Wibro, etc. Furthermore, the proposed antenna should be a good candidate as a unit of the omnidirectional array. A prototype has been fabricated and tested, and the experimental results validate the design procedure.

Design of Asymmetric Wideband Printed Dipole Antenna Using Inset Feeding Technique

“…Printed monopole antennas are generally easy to design, and impedance matching can be achieved for a frequency range 3 : 1 bandwidth as reported in [2,3]. Recently, printed monopole antennas have been widely adopted in wireless communication systems [4]. However, these antennas require a finite ground plane, defeating the desired properties of low profile and conformal nature of a printed antenna [5].…”

A Wideband Medium-Gain Vertically Polarized Omnidirectional Antenna Array

“…By using back-to-back printed dipole elements, the planar VPOA in [11] was convenient to be arrayed for a higher gain and obtained a bandwidth of 5.5%. In order to improve the impedance bandwidth of the VPOA antenna with back-to-back printed elements, a few effective approaches have been investigated [13][14][15][16][17]. By using a printed dipole with an integrated balun [12], the antenna array with 8 elements in [13] achieves a bandwidth of more than 40% with a high gain.…”

“…However, its omnidirectionality is not good due to its unidirectional radiation pattern. Based on a coupling feed structure, the printed dipole antenna in [14] achieves an operating bandwidth about 45.6%. In [15], unsymmetrical dipole elements and parasitic strips were employed to generate dual bandwidths of 20.2% and 21.3% for 2.6 GHz and 3.5 GHz bands, respectively.…”

“…Its operating bandwidth could exceed 60% by using non-symmetric U-strip stubs antennas to excite additional resonant modes. However, all these three antennas in [14][15][16][17] unfortunately bring out bulky and complicated geometry at the cost of an enlarged lateral size. Other approaches for high gain concentrate in dual-band instead of broadband for covering ranges for mobile communications based on using microstrip patches and genetic algorithm optimization are proposed [18][19][20].…”