RU1830571C - Controlled lens - Google Patents

Abstract

Usage: in antenna technology in radio astronomy, radio communications. SUMMARY OF THE INVENTION: a controllable lens comprises a base, a dielectric plate, and piezoceramic transducers, which are made in the form of a binary piezoceramic element connected at a central point by a transition element with a metal plate and fixed at its opposite ends on the base by means of elastic supports. 2 ill.

Description

The invention relates to antenna technology.

An object of the invention is to reduce microwave losses. This leads to an increase in the gain of the controlled lens.

In FIG. Figure 1 shows a general view of a controlled lens: Figure 2 shows a longitudinal and cross section of a phase-controlled element of a controlled lens.

The controllable lens consists of a base 1, a dielectric plate 2 and a lattice of phase-regulating elements 3. Each phase-regulating element 3 is made in the form of a bimorph piezoelectric ceramic element 4 connected at its central point 5 by means of a transition element 6 with a metal plate 7 and fixed with its opposite ends 9 on the base 1 using elastic supports 10. The metal plates 7 are mounted in parallel and with a gap with respect to each other and to the dielectric plate 2, forming a selective screen. The control voltage to the electrodes 11 of the piezoceramic elements 8 is applied by means of insulated conductors 12 connected to the control unit 14.

The action of the controlled lens is based on the bending of bimorph piezoelectric ceramic elements under the influence of the control voltage and the change in the gap Г0 between the metal and dielectric plates, which causes a change in the phase shift of the reflected wave 15. In this case, the presence of the dielectric plate leads to the phase enhancement effect when small changes gap 1o correspond to significant phase shifts Au. The gain in phase enhancement is approximately equal to e / 2 for DN 270 °, if e is the relative permittivity of plate 2, and is explained by numerous wave re-reflections between the metal and dielectric plates. The fastening of the metal plate 7 to the central point of the bimorph piezoelectric element 4 ensures its parallel movement in the process

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bending. The amount of movement for the moderate, for example. The 10-fold phase gain in the millimeter wave range is 40 ... 400 microns for Ap -270 °. Microwave losses in a controlled lens are reduced due to a decrease in the number of rereflections in the lens elements due to an increase in the range of movement of the metal plates 7 realized by bimorph piezoelectric elements 4.

Claims (1)

SUMMARY OF THE INVENTION A controllable lens comprising a dielectric plate, a base and a grating of piezoceramic transducers mounted on a base and connected to metal plates arranged with a gap in relation to one another and to the dielectric plate, so that In order to reduce microwave losses, each piezoceramic transducer is made in the form of a bimorph piezoelectric ceramic element, the opposite ends of which are fixed to the base by means of elastic supports, and each allicheska plate being connected to respective bimorph piezoceramic element in its central point, the width of the metal plate in the plane of the electric field vector is selected multiple of A / 2, where I - is the wavelength in free space. 0 ; fifteen g . TO / XP / f 2-L K1 57 4 / / "  H H N.V N / / J-a