Title :
A time-domain method for measuring the reflection coefficient of microwave absorbers at frequencies below 1 GHz
Author :
Ondrejka, A.R. ; Kanda, M.
Author_Institution :
Nat. Inst. for Stand. & Technol., Boulder, CO, USA
Abstract :
A wideband time-domain reflectometer has been developed to measure the reflection coefficient of RF/microwave absorbers. The advantage of using a time-domain approach is that reflections from various parts of the test chamber can be separated from one another by the differences in their time of arrival at the receiving antenna. The resultant response waveform from a fire-retardant 940-mm rotated pyramid absorber after processing is complete is shown. In addition, measurement results are presented for a non-fire retardant and a fire retardant, 660-mm long pyramid.<>
Keywords :
electromagnetic compatibility; electromagnetic wave reflection; microwave reflectometry; time-domain reflectometry; 30 to 1000 MHz; UHF; VHF; fire-retardant absorbers; microwave absorbers; nonfire-retardant absorbers; rotated pyramid absorber; time domain method; wideband time-domain reflectometer; Antenna measurements; Microwave measurements; Radio frequency; Receiving antennas; Reflection; Reflector antennas; Retardants; Testing; Time domain analysis; Wideband;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1991. AP-S. Digest
Conference_Location :
London, Ontario, Canada
Print_ISBN :
0-7803-0144-7
DOI :
10.1109/APS.1991.175174
