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Federal Research Center 
"Krasnoyarsk Science Center of the Siberian
Branch of the Russian Academy of Sciences"

 Федеральный исследовательский центр «Красноярский научный центр Сибирского отделения Российской академии наук»

Federal Research Center 
"Krasnoyarsk Science Center of the Siberian
Branch of the Russian Academy of Sciences"

A filter with a unique slope steepness has been designed to suppress radio interference

14 August 2019 г.

Разработан фильтр с уникальной крутизной склонов для подавления радиопомех
Scientists at the L.V. Kirensky Institute of Physics KSC SB RAS and Siberian Federal University have proposed a new design for a multimode stripline resonator.

The use of such resonators allows creating miniature band-pass filters with unique frequency-selective properties which are in demand in modern telecommunication systems.

The rapid development and wide use of telecommunication systems, radar systems, radio navigation and special radio equipment, along with the presence of natural sources of RF radiation, have led to a significant deterioration in the electromagnetic environment in the surrounding space. Each radio device operates in its own frequency range, simultaneously creating radio interference for its “colleagues”. To reduce the level of interference, one can use special devices to filter this "noise". Such devices, called frequency selective devices or filters, are used in radio transmitting devices to attenuate the emitted signals outside the main frequency band. In the receiving devices, they are used as preselectors, attenuating the level of interference coming from the antenna.

Thus, radio filters are designed to detect electromagnetic waves lying in certain frequency ranges. The frequency bands in which the attenuation of the signal at the filter output is small are the pass bands (transparency). The remaining frequency ranges are the rejection bands (suppression).

Today, filters are widely used in electronic technology and they have a variety of designs. Use is widely made of filters on lumped elements - inductors and capacitors; piezoelectric and magnetostrictive filters; filters on surface acoustic waves. However, in the microwave range, filters based on interacting electrodynamic resonators are most in demand. Stripline resonators have a special position among a wide variety of electrodynamic resonators. They consist of stripline conductors implemented, as a rule, on dielectric substrates. Stripline resonators are characterized by high reliability, miniature size, low cost, and most importantly - high manufacturability, which allows them to be manufactured using modern planar integrated circuit technology.

“In our work, a new design of a miniature stripline resonator implemented on a substrate with a double-sided pattern of stripline conductors was proposed. Due to the fact that several oscillation modes are used as working waves in the resonator, we managed not only to reduce the size of the band-pass filters based on such resonators, but also to significantly improve their selective properties. The filter design demonstrates a unique steepness of the passband slopes and ultra-wide high-frequency rejection band, which extends up to a frequency five times the center frequency of the passband at a level of 100 dB (interference attenuation is ten orders of magnitude). In fact, this means better selectivity than the known world analogues have. And this allows us to increase the resistance to interference, increase the quality and range of information transmission, for example, in cellular and satellite communication systems, radar and radio navigation, ” says a senior research associate at the L.V. Kirensky Institute of Physics FIC KSC SB RAS, professor of the Siberian Federal University, Aleksey Serzhantov.

Source: Siberian Science News