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Home Physics Magnetotunable elements for applications in extremely high frequency band

Magnetotunable elements for applications in extremely high frequency band

Description

Our group provides development and design of easy tunable passive elements for extremely high frequency (EHF) band applications (power dividers, directional couplers, passband filters, etc). A core of the elements under development is a novel kind of medium capable of changing a sign of the refractive index (along with changes in its value) under magnetic field. A switch to a negative value (a transition to the so-called lefthanded (LH) state) leads to drastic changes in the propagation of electromagnetic waves both inside the medium and at the boundary with an ordinary (righthanded) material. This gives rise to much broader range of tunability, compared with existing counterparts.

Fig. 1 shows a laboratory example of magnetotunable EHF coupler based on a prism capable of switching to LH state under external magnetic field. Application of magnetic field turns the state of the prism from righthanded to left-handed, which forces the refracted electromagnetic wave to pass into the lateral arm of the waveguide.

At present, complex manganese oxides (the so-called doped perovskite manganites) are used as LHswitchable materials [1]. 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, as well as the value of magnetic field makes it possible to design either broad- or narrowband elements for EHF devices.

Innovative Aspect and Main Advantages

  • relatively simple and low-cost production;
  • operation in a wide frequency range (20 – 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.

Areas of Application

Telecommunication systems (GHz and THz bands).




Fig. 1. A laboratory example of magnetotunable EHF coupler (right) based on a LH-switchable prism (left). A schematic illustration of the electromagnetic wave propagation without and with applied magnetic field is shown in the lower part of the figure.

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;
This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Prof. A. Pogorily
Institute of Magnetism, 36-b
Vernadsky Str., Kyiv 02142, Ukraine;
+38044 424 9095; Fax +38044 424 1020;
This e-mail address is being protected from spambots. You need JavaScript enabled to view it ).

Prof. S. Tarapov
Institute of Radiophysics and Electronics,
12 Acad. Proskura Str., Kharkiv 61085, Ukraine;
+38057 720 3463; Fax +38057 315 21105;
This e-mail address is being protected from spambots. You need JavaScript enabled to view it ).

References

[1]. Khodzitsky M.K., Tarapov S.I., Belozorov D.P., Pogorily A.M., Tovstolytkin A.I., Belous A.G., Solopan S.A. Negative permittivity and left-handed behavior of doped manganites in millimeter waveband // Appl. Phys. Lett. – 2010. – v. 97, No. 13. – P. 131912 (1-3).

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