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Home Physics Magnetotunable elements for applications in millimeter waveband

Magnetotunable elements for applications in millimeter waveband

Description

Our team provides development and design of easy tunable passive elements for extremely high frequency (EHF) band applications (passband filters, directional couplers, etc). A core of the elements under development is the system of planar photonic crystals formed as periodical microstrip lines and bounded with a special kind of inhomogeneity. The inhomogeneity component can be either a nonmagnetic analog of wire medium (Fig.1b) [1] or a magnetoactive element made of doped manganite, which exhibits left-handed (LH) behavior in EHF band [2]. The operation principle is based on the concept of Tamm states [1,3], which makes the system capable of concentrating the electromagnetic field in the vicinity of the inhomogeneity of a planar photonic crystal.

Fig. 1 shows a laboratory example of a planar filter (a) operating in 9-40 GHz band, based on nonmagnetic wire-medium type of inhomogeneity (b). Fig. 2 shows a laboratory example of magnetotunable EHF-filter based on doped manganite type of inhomogeneity.

The use of doped manganite (LH-switchable medium) provides a broader range of tunability. The production technology includes three successive stages. The bulk samples of LH-switchable medium are synthesized at the first stage. The second stage includes fabrication of thin films from the synthesized bulk targets. The works at the third stage are concentrated on design of magnetotunable elements based on the developed objects. A proper choice of the LH-medium parameters makes it possible to design either broad- or narrowband elements for EHF devices.


a/


b/

Fig.1. EHF filter based on planar photonic crystal with wire-medium type of inhomogeneity

Innovative Aspect and Main Advantages

  • relatively simple and low-cost production;
  • operation in a wide frequency range (9 – 40 GHz);
  • electronic (magnetic) tunability of the parameters of the elements (steepness, position, and intensity of transmission for passband filters; coupling factor for directional couplers, etc);
  • high retunability rate of controlled parameters (more than 10-9 c-1);
  • broader range of tunability, compared with existing counterparts;
  • possibility to develop elements with preset parameters.


Fig. 2. Magnetotunable EHF filter based on planar photonic crystal with doped manganite type of inhomogeneity

Areas of Application

Telecommunication systems (GHz and THz bands). Optical computer technologies.

Stage of Development

Laboratory tested.

Contact Details

Prof. A. Belous
Institute of General and Inorganic Chemistry,
32/34 Acad. Palladin Ave., Kyiv 03680, Ukraine;
+38044 424 2211;
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Prof. A. Pogorily
Institute of Magnetism, 36-b
Vernadsky Str., Kyiv 02142, Ukraine;
+38044 424 9095; Fax +38044 424 1020;
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Prof. S. Tarapov
Institute of Radiophysics and Electronics,
12 Acad. Proskura Str., Kharkiv 61085, Ukraine;
+38057 720 3463; Fax +38057 315 21105;
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References

1. D. Belozorov, A. Girich, S. Tarapov. Analogue of surface Tamm states in periodic structures on the base of microstrip waveguides. – The Radio Science Bulletin, 2013, No. 345, p. 64-72.

2. D. Belozorov, A. Girich, S. Tarapov, A. Pogorily, A. Tovstolytkin, A. Belous, and S. Solopan. Left- Handed Properties of Manganite-Perovskites La1- xSrxMnO3 at Various Dopant Concentrations. – AIP Advances, 2014, v. 4, p. 037116 (1-7).

3. D. Belozorov, A. Girich, S. Nedukh, A. Moskaltsova, and S. Tarapov. Microwave Analogue of Tamm States in Periodic Chain-Like Structures. – Progress in Electromagnetics Research Letters, 2014, v. 46, p. 7-12.

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