Abstract
In this study, a structure and design optimisation procedure of a novel compact ultra-wideband (UWB) slot antenna has been presented. In order to achieve small size of the structure andmaintain acceptable electrical performance, a sufficiently large number of geometry parameters have been introduced. These include a stepped-impedance feed line and a meandered slot with all of dimensions being parameterised and subject to optimisation. All parameters are simultaneously adjusted using automated electromagnetic (EM)-simulation-driven optimisation algorithm. The design process is oriented towards explicit size reduction of the antenna structure. Penalty function approach is utilised to control the reflection response. In order to reduce the computational cost of the optimisation process, variable-fidelity EM models are utilised. The footprint of the optimised antenna is only 8.93 × 17.9 mm (160 mm2) while maintaining reflection below the -10 dB threshold in the entire UWB frequency range. The antenna has been favourably compared with the state-of-the-art compact structures in terms of the size. The obtained numerical results are supported by measurements of the fabricated antenna prototype.
| Original language | English |
|---|---|
| Pages (from-to) | 219-223 |
| Number of pages | 5 |
| Journal | IET Microwaves, Antennas and Propagation |
| Volume | 11 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 29 Jan 2017 |
Bibliographical note
Funding Information:The authors thank Computer Simulation Technology AG, Darmstadt, Germany, for making CST Microwave Studio available. This work was partially supported by the Icelandic Centre for Research (RANNIS) grant no. 141272051 and by National Science Centre of Poland Grant 2014/15/B/ST7/04683.
Publisher Copyright:
© The Institution of Engineering and Technology 2016.