Leaky Wave Antenna Using an Inverted Strip Dielectric Waveguide

We present experimental results on a leaky wave antenna built from an inverted strip dielectric waveguide, in a frequency range going from 64 to 74 GHz. We study the frequency scanning for inclined backward beams, and the variations of gain and 3 dB beamwidth. We propose an approximate analysis for calculating the main lobe angle, and the radiating space harmonic´s amplitude. Comparison between experimental and theoretical results makes appear that the angle´s value (for inclined beams) is very sensitive to machining tolerances.