Upper bounds on fixed-geometry wheeler cap efficiency measurements - Part II: Spherical and cylindrical 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/123456789/33188
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-79959652062&partnerID=40&md5=b09e45cda4f659424a25751ceb3b9ce6	en
dc.relation.uri	http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5782549	en
dc.relation.uri	http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=05782549	en
dc.subject	Design Methodology	en
dc.subject	Efficiency Measurement	en
dc.subject	Electrically Small Antenna	en
dc.subject	System Modeling	en
dc.subject	Upper Bound	en
dc.subject	Antenna Under Test	en
dc.subject.other	Antenna size	en
dc.subject.other	Antenna under tests	en
dc.subject.other	Cut-off	en
dc.subject.other	Cylindrical cavities	en
dc.subject.other	Deterministic design	en
dc.subject.other	Efficiency measurement	en
dc.subject.other	Electrically small antennas	en
dc.subject.other	Numerical treatments	en
dc.subject.other	Planar antennas	en
dc.subject.other	Rectangular cavity	en
dc.subject.other	Spherical caps	en
dc.subject.other	System models	en
dc.subject.other	Upper Bound	en
dc.subject.other	Wheeler cap	en
dc.subject.other	Computer simulation	en
dc.subject.other	Spheres	en
dc.subject.other	Antennas	en
dc.title	Upper bounds on fixed-geometry wheeler cap efficiency measurements - Part II: Spherical and cylindrical cavities	en
heal.type	conferenceItem	en
heal.identifier.secondary	5782549	en
heal.publicationDate	2011	en
heal.abstract	A system model has been developed for the analytical and numerical treatment of the Wheeler cap technique. The model projects the properties of the antenna-under-test on the properties of the cavity, and was used in part I of the study to examine the performance of constant-size rectangular cavities. E/M simulations verified the model. Part II proceeds in the same framework and completes this two-part study, which estimates the limits of resonance-free efficiency measurements of planar antennas inside fixed-geometry Wheeler caps through a unified deterministic design methodology for 3 types of cavities. The focus is on the analytical and numerical treatment of spherical and cylindrical cavities. Spherical caps can provide coherent measurable bandwidths (BWs) in the range 2841% for antenna sizes 0.50.85 times the wavelength. Cylindrical cavities are also versatile performers and display coherent measurable BWs in the range 2040% for antenna sizes 0.50.78 times the wavelength. Electrically small antennas can secure measurable BWs up to 87% in the spherical case and up to 76% in the cylindrical one, when the cavities are operated below cut-off. © 2011 EurAAP.	en
heal.journalName	Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011	en
dc.identifier.spage	76	en
dc.identifier.epage	80	en