A Helix Excited Circularly Polarized Hollow Cylindrical Dielectric Resonator Antenna
2013 (English)In: IEEE Antennas and Wireless Propagation Letters, ISSN 1536-1225, E-ISSN 1548-5757, Vol. 12, 535-538 p.Article in journal (Refereed) Published
In this letter, we use a helix to excite two orthogonal HE11 delta modes in phase quadrature in a hollow cylindrical dielectric resonator antenna to generate circular polarization. As compared to our previous work, it is shown that replacing the cylindrical dielectric resonator antenna with a hollow cylindrical-shaped one leads to a significant enhancement in the 3-dB axial-ratio bandwidth. A design guideline is provided, and three design cases are presented. A prototype for one of the designs is fabricated and measured. Measured and simulated data are presented and discussed. It is shown that the 3-dB axial-ratio bandwidth increases as the wall thickness of the hollow cylindrical dielectric resonator decreases. Furthermore, a reduction in the wall thickness requires a longer helix exciter for similar performance.
Place, publisher, year, edition, pages
2013. Vol. 12, 535-538 p.
Circular polarization, dielectric resonator antenna (DRA), helix, hollow cylindrical, probe feed, ring
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-102781DOI: 10.1109/LAWP.2013.2257942ISI: 000318513900003ScopusID: 2-s2.0-84877734983OAI: oai:DiVA.org:kth-102781DiVA: diva2:556554
QC 20130614. Updated from In press to published.2012-09-252012-09-252013-06-14Bibliographically approved