M.S. Samsonov – Head of PCB Laboratory,

JSC «SPE «Radiosvyaz» (Krasnoyarsk)

E-mail: tybamaks90@mail.ru

An.A. Leksikov – Ph.D. (Eng.), Research Scientist,

Institute of Physics L.V. Kirensky SB RAS (Krasnoyarsk, Akademgorodok)

E-mail: laa@iph.krasn.ru

Ya.F. Bal’va – Ph.D. (Phys.-Math.), Research Scientist,

Institute of Physics L.V. Kirensky SB RAS (Krasnoyarsk, Akademgorodok)

E-mail: ya.f.balva@iph.krasn.ru

K.V. Lemberg – Ph.D. (Phys.-Math.), Research Scientist,

Institute of Physics L.V. Kirensky SB RAS (Krasnoyarsk, Akademgorodok)

E-mail: klemberg@kirensky.ru

M.O. Savishnikov – Post-graduate Student,

Siberian Federal University (Krasnoyarsk)

E-mail: savishnikov2012@yandex.ru

E.O. Grushevsky – Post-graduate Student,

Siberian Federal University (Krasnoyarsk)

E-mail: gr.e.o@iph.krasn.ru

R.G. Galeev – Dr.Sc. (Eng.), General Director,

JSC «SPE «Radiosvyaz» (Krasnoyarsk)

E-mail: kniirs1@mail.kts.ru

Microwave frequency-selective devices and, in particular, bandpass filters (BPF) are among of the most important elements in communication systems, radar, radio navigation, various measuring and special radio equipment. From the point of view of electrical characteristics, manufacturability in production and cost, multiconductor stripline resonators are optimal for a construction of filtering devices. With the obvious advantages, a multi-conductor strip resonator has one significant disadvantage – with an increase in the number of conductors additional parasitic resonances appear near the main one. In the present work, it is shown that an additional galvanic connection between non-adjacent conductors of the resonator can serve as an effective solution to this problem.

An investigation has shown that an increase in the ratio of the first two eigen frequencies of the resonator with interlayer connections is associated with an impossibility of exciting such oscillation modes in which high-frequency currents in conductors separated by two dielectric layers flow in different directions.

To demonstrate the prospect of the resonator, a sixth-order bandpass filter with a central frequency f0 = 250 MHz and a relative bandwidth Δf/f0 = 20% was designed and fabricated. It consists of 4 inner dielectric layers (RO4003CTM εr = 3,55, h1 = 0,2 mm) and 2 outer layers (F4Bm εr = 2,28, h2 = 2 mm). The filter has a stopband that extends up to a frequency of 8,4f0 with an attenuation level 38 dB.

An important advantage of the filter is its housing design, in which the screen surface is the galvanically metallized surface of the filter. This approach can significantly reduce an occupied volume and a weight of a device. The dimensions of the filter are 38×30×5 mm or 0,031λg × 0,025λg × 0,004λg, where λg is the wavelength in vacuum at the central frequency of the passband. The weight of the filter is only 14 g.

1. Patent RF № 2470418 S1. Miniatyurnyy poloskovyy resonator. Belyaev B.A., Bal'va Ya.F., Leksikov A.A., Serzhantov A.M. Zayavl. 08.12.2011. Opubl. 20.12.2012. Byul. № 35. [in Russian]
2. Belyaev B.A., Serzhantov A.M., Tyurnev V.V., Leksikov A.A., Bal’va Ya.F. Miniature Bandpass Microwave Filter with Interference Suppression by More Than 100 dB in a Wide Rejection Band. Technical Physics Letters. 2013. V. 39. № 8. P. 690–693.
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4. Patent RF № 2577485 S1. Poloskovyy resonator. Belyaev B.A., Galeev R.G., Serzhantov A.M., Leksikov A.A., Bal'va Ya.F., Leksikov An.A. Zayavl. 28.11.2014. Opubl. 20.03.2016. Byul. № 8. [in Russian]
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