TY - GEN
T1 - A cylindrical cavity resonator for material measurements with coupled resonant modes for sensing and position offset compensation of the dielectric specimen
AU - Faz, Usman
AU - Siart, Uwe
AU - Eibert, Thomas F.
N1 - Publisher Copyright:
© 2015 IMA: IMATech e.V.
PY - 2015/5/13
Y1 - 2015/5/13
N2 - A cylindrical cavity resonator is separated into two resonating sections by loading it with a metal sheet in the middle of the cavity. The metal sheet of finite thickness contains a circular aperture to support symmetric and asymmetric modes in the cavity. The pair of two modes can be simultaneously employed for sensing dielectric characteristics of rod-shaped specimen passing from top to bottom through the cylindrical cavity. In conventional cavities employed for sensing dielectric rods or tubes, a single resonance TM010 mode may result in unwanted detuning of the frequency. The unwanted shift in resonance frequency is caused due to nonuniform electric field distribution, where the total volume of the sensing region is a large fraction of the overall cavity volume. Unlike the conventional design, the main advantage of coupled cavity arrangement is to distinguish the position offset of the dielectric specimen within the sensing region of the nonuniform electric field. The asymmetric mode functions are similar to the conventional TM010, whereas the symmetric mode provides for the proximity detection of the dielectric specimen towards the edges.
AB - A cylindrical cavity resonator is separated into two resonating sections by loading it with a metal sheet in the middle of the cavity. The metal sheet of finite thickness contains a circular aperture to support symmetric and asymmetric modes in the cavity. The pair of two modes can be simultaneously employed for sensing dielectric characteristics of rod-shaped specimen passing from top to bottom through the cylindrical cavity. In conventional cavities employed for sensing dielectric rods or tubes, a single resonance TM010 mode may result in unwanted detuning of the frequency. The unwanted shift in resonance frequency is caused due to nonuniform electric field distribution, where the total volume of the sensing region is a large fraction of the overall cavity volume. Unlike the conventional design, the main advantage of coupled cavity arrangement is to distinguish the position offset of the dielectric specimen within the sensing region of the nonuniform electric field. The asymmetric mode functions are similar to the conventional TM010, whereas the symmetric mode provides for the proximity detection of the dielectric specimen towards the edges.
KW - aperture coupling
KW - coupled cavity resonator
KW - dielectric specimen
UR - http://www.scopus.com/inward/record.url?scp=84934325326&partnerID=8YFLogxK
U2 - 10.1109/GEMIC.2015.7107746
DO - 10.1109/GEMIC.2015.7107746
M3 - Conference contribution
AN - SCOPUS:84934325326
T3 - 2015 German Microwave Conference, GeMiC 2015
SP - 36
EP - 39
BT - 2015 German Microwave Conference, GeMiC 2015
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 9th German Microwave Conference, GeMiC 2015
Y2 - 16 March 2015 through 18 March 2015
ER -