SU1681346A1 - Narrow-band shf filter - Google Patents

Abstract

This invention relates to a microwave technique. The purpose of the invention is to increase the selectivity. The input microwave signal through the divider 7 is fed to converters 3 and 4, which excite magnetostatic waves in identical ferrite film resonators 1 and 2. Created by magnetostriction of ferrite in the substrate 5 pack-. Other oscillations at frequencies of acoustic resonators absorb the energy of magnetostatic waves of a ferrite film resonator 1. In substrate 6, elastic waves do not resonate and do not reverse the magnetostatic oscillations. Output voltage 13 occurs at frequencies of acoustic resonances in the ferrite passband. film resonators 1 and 2.1 zp f-ly. 1 il.

Description

The invention relates to microwave technology and can be used in devices for processing radio signals.

The purpose of the invention is to increase the selectivity and the possibility of equidistant discrete adjustment.

The drawing shows a narrow-band microwave filter.

The microwave filter contains the first and second identical ferrite film resonators 1 and 2 of magnetostatic waves, on the surface of which are placed the first and second transducers 3 and 4, respectively, for transforming electromagnetic signals into magnetostatic waves, the first substrate 5 made of plane-parallel polished on both sides of a non-magnetic material , on one side of which the first ferrite film resonator 1 is located, the second substrate 6, made of non-magnetic material, on one side of which is placed second ferrite film resonator 2 and the other side sound scattering performed and divider 7 an electromagnetic signal input 8 which is the input of the narrowband SVChfiltra. The first and second converters 3 and 4 are connected respectively to the first and second output arms 9 and 10 of the divider 7. One ends of the conductors 11 and 12 of the two-wire line are connected to the points of their connection, the other ends of which are the output 13 of the narrow-band microwave filter.

The microwave filter operates as follows.

An microwave signal is fed to input 8, which, through a divider 7, is fed to transducers 3 and 4, which excite magnetostatic oscillations in ferrite film resonators 1 and 2. Due to the magnetostriction of Ferrite, magnetostatic oscillations excite elastic waves in substrates 5 and 6. In the second substrate 6, the elastic waves decay and do not have a Reverse effect on the magnetostatic oscillations. In the first substrate 5, elastic waves repeatedly reflect and resonate, while the Q factor of the acoustic resonator formed by this substrate is higher than the Q factor of ferrite film resonators 1 and 2. At frequencies of acoustic resonances, the magnetostatic oscillations of the first ferrite film resonator 1 give their energy to acoustic vibrations, therefore, the amplitude of magnetostatic oscillations at these frequencies decreases sharply. Due to the symmetry of the system at all frequencies except the frequencies of acoustic resonances in the first substrate 5, the conductors and 12 have the same potentials and there is no signal at the output 13, and at the frequencies of the acoustic resonances the symmetry is broken and a voltage arises between the conductors 11 and 12, i.e. The microwave signal goes to output 13.

Magnetostatic waves in the substrate 5 excite two types of elastic waves — longitudinal and transverse, whose velocities and, consequently, the resonant frequencies are different. The full spectrum of resonant acoustic frequencies is formed by the superposition of two equidistant frequency grids. When an amorphous sound absorber is applied to the other side of the substrate 5, longitudinal elastic waves are absorbed and resonant only transverse elastic waves whose resonant frequencies are equidistant.

Claims (2)

Claim 1. A narrow-band microwave filter containing the first and second identical ferrite film resonators of magnetostatic waves, on the surface of which there are respectively the first and second identical converters for transforming electromagnetic signals into magnetostatic waves, and a first substrate made of plane-parallel polished on both sides of a non-magnetic material, on one side of which the first ferrite film resonator of magnetostatic waves is located, with the fact that, in order to increase In order to be selective, a second ferrite film resonator of magnetostatic waves is placed on one side of the introduced second substrate made of non-magnetic material, the other side of which is made of scattering sound, and the first and second converters are connected respectively to the first and second output arms of the introduced divider of the electromagnetic signal, the input of which is the input of a narrow-band microwave filter, while to the points of connection of the output arms of the divider of the electromagnetic signal with the first and second converter s are connected one ends of the conductors inputted two-wire line, the other ends of which are the output of the narrowband microwave filter. 2. Microwave filter pop. 1, characterized in that, in order to ensure the possibility of equidistant discrete tuning, an introduced amorphous sound absorber is deposited on the other side of the first substrate.