SU1679570A1 - Controllable microwave filter - Google Patents

Abstract

This invention relates to a microwave technique and can be used in the input circuits of a transceiver path. The aim of the invention is to expand the tuning range of a controlled microwave filter. The controlled microwave filter contains input and output sections 1 and 2 of the transmission lines, adjustment elements 3 placed on one side of the dielectric substrate 4, which is installed with a gap relative to the grounded metal surface .. The resonator on the multi-wire line is made in the form of metal strips 6 rolled up in the rings and located on both sides of the dielectric substrate 4, and the adjustment elements 3 are connected between adjacent metal strips b and their position is determined by a given ratio. The frequency tuning of the filter is performed by the tuning elements 3 by changing the structure of the resonator fields on the multi-wire line. 2 Il.

Description

/ (Rig. / 4

The invention relates to radio engineering and can be used in high-frequency blocks of transceiver equipment.

The purpose of the invention is to expand the range of adjustment,

Fig. 1 shows a controlled microwave filter; figure 2 is a section aa in figure 1.

The controlled microwave filter contains input 1 and output 2 segments of transmission lines, adjustment elements 3 placed on one side of the dielectric substrate 4, which is installed with a gap relative to the grounded metal surface 5, a resonator on a multi-wire line, made in the form of metal strips 6, rolled in the rings and located on both sides of the dielectric substrate 4, the adjustment elements 3 are included between adjacent metal strips 6 and their position is determined by the ratio

l 4.27 l :.

-TTPEGGde where f is the angle between the beams on the selected 1 or 2 transmission line segment and 1-st adjustment element 3 as the origin of reference;

n is the number of types of oscillations in the resonator on a multi-wire line, which is made in the form of metal strips 6;

Eff is the average value of the effective dielectric constant of the dielectric substrate 4 for all types of resonator oscillations on a multi-wire line.

The controlled microwave filter operates as follows.

In the resonator on a multi-conductor line made in the form of metal strips 6, rolled up in a ring, under the influence of signals coming from the input segment 1 of the transmission line electromagnetically connected to the resonator, a certain spectrum of natural electromagnetic oscillations is excited. These vibrations are classified as surface quasi-T-waves. The number of components of the low natural vibration spectrum is determined by the number of metal strips 6 located in the cross sectional plane. The frequency boundaries of the excited spectrum of natural oscillations are determined by the electrical length of the largest and smallest metal strips 6, multiple of the wavelengths in them.

The inclusion of elements 3 adjustment, for example, p-r-n-diodes between adjacent metal strips 6, rolled into a ring at a position corresponding to

The above expression changes the structure of the resonator on the multi-wire line and the frequency band of the microwave filter. Moreover, the angle fi between the beams on the 1st adjustment element 3 and the input 1 or output 2 segments of the transmission lines lies in the range from at / 4 to nil and does not depend on which of the metal strips 6 it is on. However, adjustment elements 3 are included between the inner and middle

metal strips b, control the microwave filter band from its center frequency and below, and those connected between the inner and middle metal strips control the frequency band above

central.

Claims (1)

Claims of the Invention A controlled microwave filter comprising input and output segments of transmission lines, tuning elements placed on one side of the dielectric substrate, and a grounded flat metal surface, characterized in that, in order to expand tuning range, it additionally introduced a resonator on a multi-wire line, which is made in the form of metal strips rolled into rings and located on both sides of a dielectric substrate, which is installed with a gap relative to a grounded flat metal surface, the input and output segments of transmission lines are electromagnetically connected resonator on a multi-wire line, and tuning elements are included between adjacent metal strips and their position is determined by the ratio „.- 4.27 2pUЈeff where pi is the angle between the beams on the selected transfer line segment and the 1st adjustment element; p is the number of waves of oscillations in the resonator on the multi-wire line; Eff - the average value of the effective dielectric constant bridges of a dielectric substrate for all types of resonator oscillations. / 6 6 A-A Fig2