Open AccessSlotted ground microstrip antenna with FSS reflector for high‐gain horizontal polarisation
Author(s) -
Ram Krishna R.V.S.,
Kumar R.
Publication year - 2015
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2015.0339
Subject(s) - reflector (photography) , optics , microstrip , wideband , high gain antenna , microstrip antenna , materials science , antenna gain , antenna (radio) , ground plane , bandwidth (computing) , optoelectronics , physics , coaxial antenna , electrical engineering , engineering , telecommunications , light source
The design of a high‐gain horizontally polarised antenna for ultra‐wideband (UWB) operation is presented and experimentally demonstrated. Gain enhancement is achieved by using a frequency selective surface (FSS) reflector. Both the antenna and the FSS have simple structures and are printed on a similar substrate. The antenna is a three‐stepped narrow rectangular slot excited using a three‐stepped microstrip feed line. By optimising the lengths and widths of the sections of the slot and the feed line, an ultra‐wide impedance bandwidth (3.2–12 GHz, measured) has been achieved. The FSS is a two‐layer structure where each layer is an array of rectangular patches printed on one side of the substrate. With the application of the FSS, the antenna gain is enhanced by 3–4 dBi over most of the band. The polarisation purity (in terms of the measured cross‐polar difference) is also improved with the FSS. Such an antenna–FSS combination will be useful for high‐gain UWB applications requiring horizontal polarisation.