B. A. Belyaev, A. M. Serzhantov, An. A. Leksikov, Ya. F. Bal'va, E. O. Grushevskii, S. A. Khodenkov, “A highly selective stripline lowpass filter with more than 100-dB wide stopband attenuation”, Pisma v Zhurnal Tekhnicheskoi Fiziki, 2020, Volume 46, Issue 8,Pages <nobr>10

This article is cited in 4 papers

A highly selective stripline lowpass filter with more than 100-dB wide stopband attenuation

B. A. Belyaev^ab, A. M. Serzhantov^b, An. A. Leksikov^a, Ya. F. Bal'va^a, E. O. Grushevskii^a, S. A. Khodenkov^c

^a L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
^b Siberian Federal University, Krasnoyarsk
^c M. F. Reshetnev Siberian State University of Science and Technologies

Abstract: A new miniature design of a highly selective lowpass filter based on a suspended substrate with a two-sided stripline pattern has been developed. The filter frequency response slope (cutoff attenuation rate) and stopband attenuation depth are determined by transmission zeros, the number of which is equal to the filter order. An experimental prototype of a fifth-order lowpass filter on 0.5-mm-thick alumina substrate with dielectric permittivity $\varepsilon$ = 9.8 has been synthesized with the aid of numerical electrodynamic analysis of a three-dimensional model. The cutoff frequency of the filter passband at a -1-dB level is $f_c$ = 1.75 GHz. The stopband width at a -100-dB attenuation level reaches 4.4$f_c$.

Keywords: lowpass filter, substrate, stripline resonator, stopband.

Received: 14.01.2020
Revised: 14.01.2020
Accepted: 23.01.2020

DOI: 10.21883/PJTF.2020.08.49300.18203