SU552654A1 - Ultra High Frequency Bandpass Filter - Google Patents

Description

one

This invention relates to a microwave technique.

A band-pass microwave filter is known, the contents of which are associated casing resonators with tuning elements 1.

However, the known band-pass microwave filter does not provide a change in the coupling coefficient and has a complex structure.

The purpose of the invention is to provide a change in the coupling coefficient while simplifying the design.

To do this, in a bandpass microwave filter containing coupled spiral resonators with tuning elements, resonators are made on asymmetrical stripline segments, between the central conductors of which have the shape of a volumetric spiral, a shielding plate is installed parallel to the plane of the asymmetrical stripline lines through a regulating element, for example a variable capacitor.

FIG. 1 shows the construction of a band-pass microwave filter; in fig. 2 is a section along AA of FIG. one.

A band-pass microwave filter contains coupled spiral resonators made on non-symmetrical n-strip lines, consisting of central

conductors 1 having the shape of a volumetric spiral and wound on a dielectric frame 2, and grounding plate 3; adjustment elements of spiral resonators, made in the form of diamagnetic elements 4, placed in the internal grooves of the dielectric frame 2; a shielding plate 5 installed between the center conductors 1 and connected to the ground plane 3

through the regulating element in the form of a variable capacitor 6, as well as dielectric pads 7 and studs 8.

Band-pass microwave filter works as follows.

By moving the diamagnetic elements 4 in the guides of the internal grooves of the dielectric frames 2, the resonators are tuned to the middle frequency of the bandpass filter. After the adjustment has been completed, the fixation of the position of the diamagnetic elements 4 is effected, for example, with an adhesive.

The coupling of resonators with external autotransformer circuits. Connection points for external circuits with center conductors 1

Claims (1)

are selected from the desired bandwidth of the bandpass filter. The coupling between the resonators is capacitive. The communication element is a shielding plate 5 separating the central conductors 1 and connected to the grounding plate 3 via a variable capacitor 6. The coupling coefficient between the resonators is changed by varying the capacitance value of the variable capacitor 6. Rigid heeling of central conductors 1 wound on dielectric frames 2, with respect to the grounding plug 3 and the shielding plate 5, is carried out using dielectric shims 7 and pins 8. Formula of the invention Ultra-high-frequency bandwidth a filter containing associated spiral resonators with tuning elements, characterized in that, in order to ensure a change in the coupling coefficient while simplifying the design, the resonators are made on asymmetric and strip lines, between the central conductors of which, having the form of a volumetric spiral, parallel to the plane of the asymmetric strip line A shielding plate connected to the grounding plate of an asymmetrical stripline through a regulating element, such as variable condensate, is installed. op. Sources of information taken into account in the examination of the invention 1. Zakhar Shchev L. I. Designing microwave frequency converters on resonant lines and spiral filters. M,., “Soviet Radio, 1974, p. 69 (prototype). Aa //////////////BUT VU2.2