TITLE

Transmission of convoluted periodic loop element with selective reflection

AUTHOR(S)
Teo, P. T.; Luo, X.-F.; Lee, C. K.
PUB. DATE
August 2004
SOURCE
Applied Physics Letters;8/30/2004, Vol. 85 Issue 9, p1454
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The transmission and reflectivity of electromagnetic energy across a planar layer consisting of periodic arrays of convoluted loop elements (with interelement spacing of 6.08 cm) is investigated in the lower microwave spectrum at 1.575 GHz (λ=19 cm). This relatively close spacing is achieved by convoluting the conventional 1λ square loop element at its four corners. The close interelement spacing provides a stable passband frequency response over wide angles of wave incidence, while the convoluted segment provides a short circuit response when the segment length is λ/4 long. The short circuit will provide a reflection to the electromagnetic energy at the selected band-stop frequency range. Various design considerations have been adopted to meet the challenge of ensuring a common passband bandwidth of 22.47% (1.5–1.95 GHz), with a transmission loss of less than 0.5 dB for scan angles up to 45° in both TE and TM polarization.
ACCESSION #
14258829

 

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