Open AccessPolarisation‐dependent absorber based on resistor‐loaded rectangular loop resonators
Author(s) -
Wang S.,
Deng G.,
Horestani A.K.,
Fumeaux C.
Publication year - 2016
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2015.4509
Subject(s) - resistor , resonator , ground plane , materials science , bandwidth (computing) , dissipation , optics , optoelectronics , microwave , reflection (computer programming) , acoustics , electrical engineering , physics , antenna (radio) , engineering , voltage , computer science , telecommunications , thermodynamics , programming language , quantum mechanics
This Letter presents a design of a polarisation‐dependent resistor‐loaded resonant absorber at microwave frequencies. The unit cell includes a metallic loop and a metallic ground plane, separated by a 3.2 mm FR‐4 substrate. A resistor is used to connect the top and bottom layers to create an optimal load for dissipation of the power accepted by the structure in a desired polarisation. Experiments performed on a prototype consisting of 10 × 10 unit cells demonstrate that the absorber can achieve near unity absorption in co‐polarised direction and almost full reflection in cross‐polarised direction at its working frequency of 2.52 GHz. The measured bandwidth of the absorber reaches 0.17 GHz (6.7%), which is wider than comparable designs using electric‐field‐coupled‐LC resonators. The optimal resistor selection and the effect of radio‐frequency behaviour of the loading resistor on the absorbing properties is investigated.