Title :
A novel leaky NRD guide with a double-layer dielectric slab
Author :
Zeng, Xiang-yin ; Luk, Kwai-Man ; Xu, Shan-jia
Author_Institution :
Dept. of Electro. Eng. & Inf., Univ. of Sci. & Technol. of China, Kowloon, China
fDate :
4/1/2001 12:00:00 AM
Abstract :
A new leaky nonradiative dielectric guide with a double-layer dielectric slab is investigated in this paper by combining a multimode network theory with a mode-matching method. Numerical results show that proper selection of the permittivities can vary the leakage constant over a wide range. A leakage constant larger than 10% of free-space wavenumber can be obtained easily without entering the cutoff region. Leaky-wave antennas with shorter length and medium gain can thus be developed. In addition, the present leaky guide possesses the advantages of simple fabrication and physical stability. Extensive numerical results are provided to guide the antenna designs
Keywords :
leaky wave antennas; millimetre wave antennas; mode matching; nonradiative dielectric waveguides; antenna designs; cutoff region; double-layer dielectric slab; free-space wavenumber; gain; leakage constant; leaky NRD guide; leaky-wave antennas; mode-matching method; multimode network theory; physical stability; Attenuation; Dielectrics; Fabrication; Gratings; Leaky wave antennas; Millimeter wave technology; Mode matching methods; Permittivity; Propagation constant; Slabs;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
