SU1160487A2 - Super-high-frequency filter - Google Patents

Abstract

ULTRA-FREQUENCY FILTER on aut. St. No. 543051, distinguished by the fact that, in order to noBbidne thermal parameters, one of the faces of the dielectric liner facing the soft wall of the waveguide section is convex, and the ratio of the height b of the convex part of the dielectric contribution to its height H in the direction perpendicular to the wide walls of the waveguide segment, lies within 1i 0.02 - 0.12.

Description

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FIG. [0001] The invention relates to the field of microwave and can be used in the microwave path of products of radio communication equipment operating in a wide temperature range. According to the main author. St. No. 543051 is known for an ultrahigh-frequency filter containing a cavity resonator made on a waveguide section having a rectangular cross section and an dielectric insert installed inside it, referred to as resonant dimensions, and through a rod connected to a temperature compensating element located outside the wave section from the wide side. In this device, the amplitude-frequency characteristic (AFC) has two bands of transmission that are formed due to the connection of two resonant types of oscillations of the dielectric liner. The temperature stabilization system provides compensation for the temperature drift of neutral bandwidths with an accuracy of ± 2 NHz in the temperature range tO However, there is a difference in the temperature gap of the frequency drift in each of the passbands, which does not allow for its higher thermal stability. The purpose of the invention is to increase the thermal stability of the parameters. The goal is achieved by the fact that in a super-high-frequency filter containing a cavity resonator, filled with a waveguide section, with a rectangular cross-section of the sample, and an electrical insert inside it, having resonant dimensions and using a rod connected to a thermal compensator with an element disposed outside the waveguide section the sides of the wide wall, one of the faces of the dielectric liner facing the wide segment of the waveguide, is made “two-pointed, with the ratio of the height b of the convex part ielektricheskogo vkla breathing to height H in a direction perpendicular to the broad walls of the waveguide segment is in the range 0,02-0,12 NZH-. FIG. 1 schematically depicts a microwave filter; in fig. 2 is a section A-A in FIG. 1. The microwave filter contains a cavity resonator pulsed 872 on a segment of a waveguide 1 of rectangular cross section, and. The dielectric plug 2 inside it, the resonance dimensions connected to the thermal compensating element 3 by means of the rod 4, and one of the faces of the dielectric plug 2 facing the wide wall 5 of the waveguide 1 is filled with a voltage. UHF filter in the temperature range works as follows. A change in temperature leads to a change in the size of a waveDia .1 segment, the dielectric frequency eigenfrequency loss, as well as a change in the linear, dimensions of the thermal compensation element 3. At the same time, the dielectric insert 2 relative to the wide wall 5 of the waveguide 1 shifts so far. to compensate for the temperature drift of the center frequency bands of the super high pass filter. In the proposed device, the frequency response has two bandwidths, which are formed due to the connection of two resonant types of oscillations (the main and one of the highest ones). To accurately compensate for the temperature drop in frequency at both transmission poles, it is required, in particular, that the first derivatives of the dependencies of the resonant frequencies depend on the distance between the dielectric contribution 2 and the wide wall 5 of the waveguide 1 for the associated resonant oscillations. These dependences have the form of quadratic parabolas. The implementation of the dielectric liner 2 with the specified ratios, dimensions and shape leads to the fact that the distance from the dielectric input is. 2 to the wall 5 of the segment of the waveguide 1, measured at the maxima of the electric fields of the main and main types of oscillations, are different, and the first derivatives of the dependencies of the resonant frequencies of these types of oscillations on the distance between the dielectric contribution 2 and the wide wall 5 of the segment of the waveguide 1 are equal . As a result, the effect of the thermocompensating element 3 in both passbands is heading off, which makes it possible to increase the thermal effect.

the stability of the parameters of the microwave filter.

The boundary values of the ratio -, equal to 0.2 and 0, 12, are chosen in accordance with the experimental data.

The maximum temperature deviation of the center frequencies of the device bandwidths in these cases is 1.8 MHz and t, 9 MHz respectively.

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At the optimally chosen ratio of the temperature points of the central frequencies of the passbands do not exceed ± 1 MHz in the temperature range, which is twice as low as that of the superhigh-frequency filter, as known.

The use of the proposed technical solution will allow to increase the thermal stability of the parameters of such devices and preserve the shape of their frequency response in a wide range of temperatures.

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Fig 2

Claims (1)

I HIGH FREQUENCY FILTER by ed. St. No. 543051, distinguished by the fact that, with the whole increase in the thermal stability of the parameters, one of the faces of the dielectric insert facing the wide wall of the waveguide segment is convex, and the ratio of the height h of the convex part of the dielectric insert to height H in the direction perpendicular to the wide walls of the