Upper bounds on fixed-geometry wheeler cap efficiency measurements - Part I: System model and rectangular cavities

Kakoyiannis, C; Constantinou, P

dc.contributor.author	Kakoyiannis, C	en
dc.contributor.author	Constantinou, P	en
dc.date.accessioned	2014-03-01T02:47:30Z
dc.date.available	2014-03-01T02:47:30Z
dc.date.issued	2011	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/33187
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-79959657599&partnerID=40&md5=97ceb5bc23646a9560a5a2e72236b487	en
dc.relation.uri	http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=05782534	en
dc.relation.uri	http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5782534	en
dc.subject	Cost Efficiency	en
dc.subject	Efficiency Measurement	en
dc.subject	Performance Metric	en
dc.subject	System Modeling	en
dc.subject	Upper Bound	en
dc.subject.other	Antenna efficiency	en
dc.subject.other	Antenna size	en
dc.subject.other	Cost-efficient	en
dc.subject.other	Efficiency measurement	en
dc.subject.other	Energy leakage	en
dc.subject.other	Natural cavity	en
dc.subject.other	Performance metrices	en
dc.subject.other	Planar antennas	en
dc.subject.other	Rectangular cavity	en
dc.subject.other	Small antenna	en
dc.subject.other	System models	en
dc.subject.other	Upper Bound	en
dc.subject.other	Wheeler cap	en
dc.subject.other	Cavity resonators	en
dc.subject.other	Geometry	en
dc.subject.other	Resonance	en
dc.subject.other	Antennas	en
dc.title	Upper bounds on fixed-geometry wheeler cap efficiency measurements - Part I: System model and rectangular cavities	en
heal.type	conferenceItem	en
heal.identifier.secondary	5782534	en
heal.publicationDate	2011	en
heal.abstract	Antenna efficiency is a critical performance metric, but also difficult to determine accurately. Wheeler's elegant idea is a simple, fast, repeatable and accurate technique of measuring small antenna efficiency inside shielded cavities. Natural cavity resonances violate the Wheeler cap principle, produce negative efficiency values, and reduce the measurable bandwidth (BW) and/or size of the antenna. Resonances can be avoided by using variable-geometry cavities; however, these require precise manufacturing to avoid energy leakage. Fixed-geometry cavities are easier to build and far more cost-efficient. This two-part study estimates the limits of dip-free efficiency measurements for planar antennas inside fixed-geometry caps. Part I firstly describes the joint antenna-cavity system model enabling the analyses. This is followed by a treatment of rectangular cavities, which display coherent measurable BWs in the range 1533% for antenna sizes 0.50.78 times the wavelength. Finally, part I shows that the methodology can be readily extended to arbitrary antennas. © 2011 EurAAP.	en
heal.journalName	Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011	en
dc.identifier.spage	71	en
dc.identifier.epage	75	en