Abstract
The mounting groove of finline circuits is always the area of research for low loss E-Plane components. The normal practice says, the groove depth should be kept λ/4 or λ/2 according to the termination at the top surface for electrical short inside the waveguide. Here we have investigated the effect experimentally at Ka-Band for short ended circuit grooves. It has been found that if the groove depth is kept λ/10, just adequate to hold the card vertical rigidly, considerable improvement has been observed in the Insertion Loss of the line. An improvement of 0.6 dB has been observed with λ/4 to λ/10 groove depth for short ended circuit for Symmetric unilateral finline.
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Mittal, A. Experimental modelling of groove effect on finline transitions at Ka-Band. Int J Infrared Milli Waves 17, 905–913 (1996). https://doi.org/10.1007/BF02101398
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DOI: https://doi.org/10.1007/BF02101398