International Conference on Actual Problems of Electron Devices Engineering (APEDE) (2014 : Saratov, Russia)2015-10-072015-10-072014Smith, JN & Stander, T 2014, 'An L-band tapered-ridge SIW-to-CPW trasition', 2014 International Conference on Actual Problems of Electron Devices Engineering (APEDE) , 25-26 Sept. 2014, Saratov, Russia, pp. 171-177.978-1-4799-3437-910.1109/APEDE.2014.6958741http://hdl.handle.net/2263/50171Paper presented at the 2014 International Conference on Actual Problems of Electron Devices Engineering (APEDE) , 25-26 Sept. 2014, Saratov, Russia.A tapered ridge transition between coplanar waveguide and substrate-integrated waveguide is presented. The taper is implemented through staircase metallization across 10 layers of conventional RF substrate with sidewall expansion and upper cut-out using Vivaldi-type exponential tapers. Fractional bandwidth of 36% is achieved in the L-band, with insertion loss of 0.5 dB and return loss of 15 dB.en© 2014 IEEETapered ridge transitionCoplanar waveguideSubstrate-integrated waveguidePresentation