JPS604305A - Branching circuit - Google Patents

Abstract

PURPOSE:To prevent the influence of an auxiliary waveguide upon a main waveguide by connecting waveguides, each of which is divided into two in the long side direction and has a radio wave absorbing body inserted internally, to end parts of the auxiliary waveguide. CONSTITUTION:Dimensions of parts, which are connected to long sides of an auxiliary waveguide 2, of terminating waveguides 10a and 10b are so selected that a frequency f1 is cut off and a frequency f2 passes through. Radio waves having the frequency f1 which are branched to the auxiliary waveguide 2 are taken out from coaxial tubes 6 by converters constituted with terminating waveguides 10a and 10b and coaxial tubes 6. Meanwhile, radio waves having the frequency f2 which are leaked to the auxiliary waveguide 2 are absorbed by radio wave absorbing bodies 12a and 12b. Consequently, cavity resonance of the frequency f2 cannot be caused in the auxiliary waveguide 2, and radio waves having the frequency f2 which are leaked to the auxiliary waveguide 2 have no influence upon radio waves having the frequency f2 which pass through a main waveguide 1, and the increase of loss and a delay distortion are not generated.

Description

[Detailed Description of the Invention] This invention generates two or more electric currents in different frequency bands,
Or, conversely, it concerns the improvement of preparative separation circuits.

First, the entire conventional separation circuit will be explained with reference to FIG. 1. Here, we will take as an example a circuit that separates radio waves with two frequency V numbers f1+f2 (h</21).

In the figure (11 is the two frequencies fl + h, 'i [
(21 is a sub-conductor V-tube which is directly connected to this main wave-conductor 111 and takes out radio waves of frequency fl, (3) is this sub-guide pipe. (41
is placed in this coupling hole (3) and has 9 frequencies f2! A series resonant element (5) that prevents [ from entering the sub waveguide (2) through the coupling hole (3);
), (6) is a coaxial tube for extracting radio waves of frequency f1 from the wall surface of the sub-waveguide (2), (6al is the outer conductor that constitutes the coaxial tube (6), (6bl is Similarly, the inner conductor (6cl is the above outer conductor (6a) and the inner conductor (
6b) is a dielectric support for maintaining the mutual relationship.

With the preparative circuit configured in this way, the main waveguide 111 is now connected.
If two TVs with frequencies 11+f2 are introduced in fc,
Since the direct IJ joint transducer (4) is in a series resonant state with respect to the electric voltage V of frequency f2, the electric wave of frequency f2 is transmitted through the coupling hole (3).
is hardly affected.

, Therefore, a reflecting surface is formed behind the main waveguide fi+, which reflects the radio wave of frequency f1 to the source metal, but allows the radio wave of frequency f2 to pass through without being reflected. For example, by providing a tapered 4-waveguide (not shown), the electric current V of frequency f1 of the two waveguides introduced into the main waveguide fi+ is transferred to the sub-waveguide 1.
2) occurs. The circumference α number f1 that entered the tube +21 in the training θ
The radio waves can be extracted from the same I1IllI tube (6) by a coaxial waveguide converter formed by the short circuit surface (51 and the same Ill tube 16).

Since the conventional divider circuit is configured as described above, the frequency node where the old column resonance resistor 14) acts as an isometric shorting surface is narrow, so the 9 frequency f2 is connected to the series resonance element (4). If it deviates from the 11-column resonance frequency mantissa of , a small portion of the radio wave of frequency f2 will be lost.

The radio waves of frequency f2 leaked into the sub-waveguide (12) from the coupling hole (3) enter the sub-waveguide (2). ) and the short-circuit surface (51 formed by n
When the frequency matches one of the resonant frequency of the cavity resonant device, the cavity resonance is stimulated here, resulting in increased loss and delay distortion noise for the radio wave of frequency f2 passing through the main wave tube (1). There was a drawback.

The present invention seeks to eliminate the above-mentioned drawbacks of conventional generator circuits.

An embodiment of the present invention shown in FIG. 2 will be described below.

In Fig. 2, (1(Ial and (ItJbl) are the sub-waveguides (n), the long side of the sub-waveguide (2) is spun into two, and the long side of the sub-waveguide (2) is divided into two. Connecting surface of pipe (2) and the above terminal 4eg (lual and (IUbl), f1
2al and +12bl fi above end 17 #li waveguide (lfal and ke obl middle VC @ person tLfc electric current absorber.

Here, the dimension near the long side of the sub-waveguide (2) of the terminating 244rEl pipe Ual and Obl is the frequency f1
It is determined that the radio waves of frequency f2 are blocked, and the radio waves of frequency f2 are allowed to pass through.

In this case, the radio wave of frequency f1 that has entered from the y + O to the V lightning (2;) is connected to the coaxial pipe (6) and the connecting surface
The coaxial pipe (61
It can be said that it is a complete collection. - 10,000, the terminal ureter tube (1υa) connected to the sub waveguide (2) and ( It enters the IUblO and is absorbed by the 1JL absorbers 112a) and (12b).

Therefore, in a circuit configured as shown in FIG. However, it has the characteristic that it does not cause any increase in loss or delay distortion.

In addition, although the above explanation shows the case where radio waves with two frequencies are introduced into the main wave pipe, there is no limit to the number of radio waves and radio waves to be introduced.

[Brief explanation of the drawing]

Figure 1 shows the conventional part [IL! FIG. 2 is a perspective view, partially missing, showing a circuit, and FIG. 2 is a perspective view, partially missing, showing an embodiment of the present invention. In the figure, (1) is the main four-way tube, (2) is the sub-fourth tube, (3) is the coupling hole, (4) is the series resonant element, (6) is the coaxial tube, (
10al and [10bl are terminal ureter tubes, (12al
and (12bl is a radio wave absorber. In Figure 1, the same or corresponding parts are indicated with a direction symbol. ゛, - Figure 2 fl Continued from page 1 0 Inventor: Yo Isota 325 Kamimachiya, Kamakura-shi Mitsubishi Electric Corporation Information and Electronics Research Laboratory 0 Applicants Mitsubishi Electric Corporation 2-2-3 Marunouchi, Chiyoda-ku, Tokyo

Claims (1)

[Claims] A separation circuit comprising a main waveguide, a sub-V pipe connected to the main V-pipe via a coupling hole, and a coaxial line connected to the sub-waveguide, The end face of the sub-waveguide is divided into two along its long side. And a pair of four-way tubes, each with a radio wave absorber inserted, were connected in parallel! A preparative circuit with characteristics.