A Leaky-Wave Antenna Using Periodic Dielectric Perforation for Millimeter-Wave Applications

A periodic leaky-wave antenna is reported in substrate integrated nonradiative dielectric waveguide technology. Periodical change of substrate permittivity along the waveguide channel is used to perturb the propagating LSE₁₁ mode. The hosting substrate is perforated following a periodicity to realize the perturbation. Thus, the antenna structure is very easy to implement and suitable for millimeter-wave applications. The antenna scan performance and leakage rate is dependent on the periodicity and size of the perturbation. Guidelines for choice of the parameters along with the condition for radiation of only one beam over the frequency range of interest are discussed. The developed antenna on Alumina substrate shows a good scan performance from -35° to 7° over the frequency range 96 to 108 GHz with a gain better than 10 dBi.