Theory and Design of LowInsertion Loss Fin （理论和设计LowInsertion鳍损失）.pdf

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. MTT-30, NO. 2, FEBRUARY 1982 155 Theory and Design of Low-Insertion Loss Fin-Line Filters FRITZ ARNDT, JENS BORNEMANN, DIETRICH GRAUERHOLZ, AND RUDIGER VAHLDIECK Abstract —A design theory is deseribed for low-insertion loss fin-line Substrate filters that includes both higher order mode propagation and finite thick- ness of the dielectric substrate and the metallic fins. Design data for (a) Metal Wall three-resonator type fin-line filters with several substrate thicknesses are given for midband frequencies of about 15,34, and 66 GHz. The measured insertion losses in the passband are 0.25, 0.5, and 1.3 dB, respectively, for Metal Fms these three frequencies. I. INTRODUCTION NTEGRATED FIN-LINE is a very attractive medium I for millimeter-wave applications [1]-[ 11]. The ad- vantages of these circuits include the potential of low-inser- tion loss designs, if extremely high gap widths g/b= 1 (Fig. 1) are taken into account [2]. This paper introduces a