Title :
Q Evaluation of Small Insulated Antennas in a Lossy Medium and Practical Radiation Efficiency Estimation
Author :
Lee, Jaechun ; Nam, Sangwook
Author_Institution :
Seoul Nat. Univ., Seoul
Abstract :
Quality factors (Q) of small insulated antennas in a lossy dielectric medium are evaluated using Chu´s equivalent circuits of TM01 and TE01 spherical waves. Using the evaluated Q, the upper limit of radiation efficiency for the required bandwidth is calculated for the link loss estimation. The result shows that a magnetic type antenna has much higher Q and the advantage in its radiation efficiency is sacrificed at low frequency for the required bandwidth.
Keywords :
Q-factor; absorbing media; antennas; equivalent circuits; Chu equivalent circuit; Q evaluation; link loss estimation; lossy medium; practical radiation efficiency estimation; quality factors; small insulated antennas; Bandwidth; Biological system modeling; Dielectric losses; Dipole antennas; Endoscopes; Equivalent circuits; Humans; Insulation; Propagation losses; Transmitting antennas; Lossy medium; Q; radiation efficiency; small antenna;
Conference_Titel :
Microwave Conference, 2007. KJMW 2007. Korea-Japan
Conference_Location :
Okinawa
Print_ISBN :
978-1-4244-1556-4
DOI :
10.1109/KJMW.2007.4402241
