Open AccessFront‐to‐back ratio improvement of printed antennas based on electrically small resonators for microwave presence detectors
Author(s) -
Aguilà P.,
Zuffanelli S.,
Zamora G.,
Paredes F.,
Martín F.,
Bonache J.
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.2014.4303
Subject(s) - resonator , microwave , detector , optoelectronics , materials science , slot antenna , optics , directional antenna , electrical engineering , engineering , antenna (radio) , physics , telecommunications
The improvement of the front‐to‐back ratio (FBR) in low‐profile antennas to be used in presence detection devices is explored. The main idea is to use electrically small resonators as radiating elements. This minimises the electric currents in the boundary of the ground plane at the working frequency, thus reducing the backward radiation. The choice of the resonant particle and its electromagnetic properties, along with the antenna structure, are discussed. The simulated results indicate that there is good impedance matching (−18 dB) at the operating frequency (3 GHz) and an excellent FBR of 24 dB. These characteristics are validated experimentally and the FBR is compared with that of a conventional patch antenna.