Title :
Miniature multi-band monopole antenna using spiral ring resonators for radiation pattern characteristics improvement
Author :
Wan, Yang-Tao ; Yu, Daren ; Zhang, F.-S. ; Zhang, Fang
Author_Institution :
Nat. Lab. of Sci. & Technol. on Antennas & Microwaves, Xidian Univ., Xi´an, China
Abstract :
A compact coplanar waveguide (CPW)-fed multi-band monopole antenna loaded with spiral ring resonators is presented. The proposed antenna consists of two spiral ring strips which are printed on the different sides of the substrate and connected through a via-hole. The size of the miniaturised antenna is only about 27.5 × 20 × 1 mm3. The proposed antenna can excite multi-resonant modes close to the 2.5/3.5/5.5 GHz bands to meet the specifications of the worldwide interoperability for microwave access (WiMAX) system. By introducing the spiral ring structure, very good radiation pattern characteristics can be obtained. With a figure-of-eight pattern in the E-plane and omnidirectional pattern in the H-plane, measured peak gains are about 2.0/2.23/2.58 dBi at the 2.5/3.5/5.5 GHz operating bands, respectively.
Keywords :
WiMax; antenna radiation patterns; coplanar waveguides; microwave antennas; microwave resonators; monopole antennas; multifrequency antennas; omnidirectional antennas; strips; CPW-fed multiband monopole antenna; E-plane; H-plane; WiMAX system; compact coplanar waveguide-fed multiband monopole antenna; figure-of-eight pattern; frequency 2.5 GHz; frequency 3.5 GHz; frequency 5.5 GHz; multiresonant modes; omnidirectional pattern; peak gain measurement; radiation pattern characteristics improvement; spiral ring resonators; spiral ring strips; spiral ring structure; via-hole; worldwide interoperability for microwave access system;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2012.3980
