Accession Number : ADA560534


Title :   Design of Tunable, Thin, and Wide-band Microwave Absorbers


Descriptive Note : Final rept. 19 Apr 2011-18 Apr 2012


Corporate Author : NANYANG TECHNOLOGICAL UNIV (SINGAPORE) SCHOOL OF ELECTRONIC AND ELECTRICAL ENGINEERING


Personal Author(s) : Shen, Zhongxiang


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a560534.pdf


Report Date : 05 Apr 2012


Pagination or Media Count : 15


Abstract : Recent development in military and civilian applications requires switchable or tunable radar absorbers, which are very useful in electromagnetic compatibility test facilities, radar camouflage and deception roles, and tagging and asset tracking systems. There are a number of designs for tunable or switchable absorbers available in the literature. Almost all the designs use either liquid crystal materials or diodes to realize the tunability. Unfortunately, the operation bandwidth of most existing tunable absorbers is narrow and the achieved tunable frequency range is very small. Unlike existing tunable absorbers, we realize the tunable absorber through electronically changing its equivalent thickness of the absorber for different frequency bands. The operating principle is verified by theoretical analysis and experiment results. Both simulated and measured results show that this absorber can realize a wide bandwidth and its thickness is less than one-tenth free-space wavelength at the lowest frequency.


Descriptors :   *ABSORBERS(EQUIPMENT) , *BROADBAND , *ELECTROMAGNETIC COMPATIBILITY , *RADAR CAMOUFLAGE , FREQUENCY BANDS , LIQUID CRYSTALS , METAMATERIALS , MILITARY APPLICATIONS , SINGAPORE , TEST FACILITIES , TRACKING


Subject Categories : Radar Countermeasures
      Electricity and Magnetism


Distribution Statement : APPROVED FOR PUBLIC RELEASE