Title :
Ultra-thin tunable microwave absorber using liquid crystals
Author :
Fusco, V.F. ; Cahill, R. ; Hu, W. ; Simms, S.
Author_Institution :
Queen´´s Univ. Belfast, Belfast
Abstract :
A dynamically adaptive radar absorber is described which is based on a periodic array of microstrip patches that are printed on a 500 mum-thick liquid crystal substrate. The measured reflectivity of the structure is less than -38 dB with a 200 MHz -10 dB bandwidth at 10.19 GHz when a +4 DC bias is applied. It is shown that a 34 dB reduction in signal loss occurs when the bias voltage is increased to 20 V.
Keywords :
adaptive radar; electromagnetic wave absorption; liquid crystals; microstrip antenna arrays; microwave materials; adaptive radar absorber; bias voltage; liquid crystal substrate; liquid crystals; microstrip patches; periodic array; signal loss; ultra-thin tunable microwave absorber;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20082191
