1. Local Metamaterial-Based Waveguides in Gaps Between Parallel Metal Plates
2. Kildal P.S. Ng M. Kehn M.: ‘The ridge gap waveguide as a wideband rectangular hard waveguide’ 4th European Conf. on Antennas and Propagation (EuCAP 2014) Barcelona Spain April2010 pp.1–4
3. Kildal P.S.: ‘Three metamaterial‐based gap waveguides between parallel metal plates for mm/submm waves’ 3rd European Conf. on Antennas and Propagation (EuCAP 2009) Berlin Germany March2009 pp.28–32
4. Corporate‐fed planar 60 GHz slot array made of three unconnected metal layers using AMC pin surface for the gap waveguide;Vosoogh A.;IEEE Antennas Wirel. Propag. Lett.,2015
5. Wideband and High-Gain Corporate-Fed Gap Waveguide Slot Array Antenna With ETSI Class II Radiation Pattern in $V$ -Band