Transmission of convoluted periodic loop element with selective reflection

Teo, P. T.; Luo, X-F; Lee, C. K.

doi:doi:10.1063/1.1769076

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Applied Physics Letters / Volume 85 / Issue 9 / LASERS, OPTICS, AND OPTOELECTRONICS

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Appl. Phys. Lett. 85, 1454 (2004); http://dx.doi.org/10.1063/1.1769076 (3 pages)

Transmission of convoluted periodic loop element with selective reflection

P. T. Teo, X-F Luo, and C. K. Lee

School of Electrical and Electronic Engineering, Nanyang Technological University, Block S1, Nanyang Avenue, Singapore 639798

(Received 5 January 2004; accepted 10 May 2004)

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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.