Compact printed ultra‐wideband diversity monopole antenna with slant inverted tree‐shaped stub
Open Access
- 1 November 2015
- journal article
- research article
- Published by Institution of Engineering and Technology (IET) in IET Microwaves, Antennas & Propagation
- Vol. 9 (14), 1595-1604
- https://doi.org/10.1049/iet-map.2015.0113
Abstract
A compact two-port diversity antenna is proposed and experimentally investigated. One of the ports is connected to a microstrip feed, whereas the other port to a coplanar waveguide feed. The radiating elements are semi-circular disc-shaped monopoles rotated around their centres. By shaping the common ground plane, ultra-wide impedance bandwidth is achieved. The measured bandwidths are 2–12 GHz at port 1 and 2.3–10.2 GHz at port 2. To obtain good isolation between the ports, a slant inverted tree-shaped structure is attached at the corner of the ground plane. The measured isolation is about 20 dB throughout the band. The antenna has omni-directional radiation patterns with a moderate peak gain of 2–7 dBi. To evaluate the diversity performance, the envelope correlation coefficient, diversity gain and capacity loss are calculated. A modified design with impedance bandwidth at port 2 extending beyond 11 GHz is also presented. The proposed diversity antenna is an attractive candidate to provide polarisation diversity and enhance channel capacity in a rich scattering environment.Keywords
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