SU720587A1 - Frequency separator - Google Patents

Description

one

The invention relates to microwave technology, can be used in small-sized multi-channel transceivers.

A frequency separator is known, comprising a housing with input and output connectors, inside which the excitation line is located, shorted at one end, and the core filters connected to it, tuned to different frequencies and separated by screens, the filter resonators installed parallel to the excitation line 1.

However, the known frequency separator has large dimensions and poor frequency response.

The purpose of the invention is to reduce the size and improve the frequency response.

To do this, in the frequency splitter, which contains a housing with input and output connectors, inside which there is an excitation line, shorted at one end, and rod filters connected to it, tuned to different frequencies and separated by screens, filter resonators are installed parallel to the excitation line, filters are located in SEVERAL layers and the centers of their first resonators lie on a circle, concentric exciting line, and the length of the exciting line is chosen equal to the length of the resonator, set to low th frequency.

FIG. Figure 1 shows the construction of a frequency splitter with four rod filters; in fig. 2 is a view A-A in FIG. one; in fig. 3 is a view of BB in FIG. 2; in fig. 4 shows a variant of the construction of the frequency splitter.

Inside the housing 1 with the input and output connectors 2 and 3, the excitation line 4 is located, shorted at one end, and the rod filters 5–8 connected to it, tuned to different frequencies and separated by screens 9, 10, and the ph.php resonators are parallel exciting line. The filters are arranged in several layers and the centers of their first resonators 11-14 lie on a circle concentric with excitation, and the length of the exciting line 4 is equal to the length of the resonator tuned to a low frequency.

Frequency separator works as follows.

The frequency fi for filter 5 corresponds to geosurveyance, and for filters 6--8 to the stop bands. If the filters are 5-8 narrow-band, then the reactive resistances introduced by them into the exciting line 4 are small. Since the filter 5 is set so that its even resonators are short-circuited in the short circuit plane of the exciting line 4, the signal fi passes through it almost without distortion. Similarly, the transmission of signals corresponding to the passbands of filters 6-8.

The number of core filter layers is selected from the condition:

2l (-1 + Sei + 4-) Pb. Where do is the excitation line diameter; di is the diameter of the first resonator; So 1 is the width of the gap between the excitation line and the first resonator; n is the number of layers; h - distance between grounded

filter plates,

and the length of the exciting line is equal to the length of the resonator of the lowest-pass filter.

FIG. Figure 4 shows the construction of a frequency splitter with four layers of rod filters.

Compared with the prototype frequency divider has smaller dimensions, 2-3 times less volume and better frequency response.

Claims (1)

Invention Formula A frequency separator comprising a housing with input and output connectors, inside which the excitation line is located, is shorted at one end, and the rod filters connected to it, tuned to different frequencies and separated by screens, the resonators of the rod filters installed parallel to the excitation line, distinguished by that, in order to reduce the size and improve the frequency response, the filters are arranged in several layers and the centers of their first resonators lie on a circle concentrating the exciting line and wherein the selected exciting line length equal to the length of the resonator, tuned to a lower frequency. Sources of information taken into account during the examination 1. Author's certificate of USSR No. 416795, cl. H 01 R 1/20, 197 (prototype) Have / FIG.