JPS58119205A - Waveguide coupling device - Google Patents

Abstract

PURPOSE:To attain excellent directional coupling over a wide band, by combining two ridge waveguides in T-shape, as a branching waveguide connecting parallel waveguides. CONSTITUTION:A main waveguide 1 having terminalsI, II and a subwaveguide 2 having terminals III, IV are placed in parallel by opposing broad planes and connected with the branching waveguides 4, 5 having about 1/4 guide wavelength. The waveguides 4, 5 are ridge waveguides and form one branching waveguide with T-shaped combination. Waves incident from the terminalIand coupled via the waveguide 4 are electric fields in the same direction and outputted to terminals III, IV. On the other hand, waves coupled via the waveguide 5 are electric fields in the opposite direction and outputted to the terminals III and IV. Thus, the waves at the terminal III are cancelled and the coupling waves are outputted to the terminal IV only. Thus, excellent directive coupling is obtained over a wide band.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to the improvement of a snow-type coupler using microwave wave distortion. Let's explain as fo.

First, the conventional conduit coupler shown in FIG. 1 will be briefly explained.

In Figure 1, there are 1lli main waveguide, 121rX sub-waveguide, (31μ branch 24 main waveguides, and ■ and ■ four main waveguides (I
The + terminals, ■ and ■ are the terminals of the secondary groove tracheid (2).

The main limb canal fi + and the minor groove v'ii + 21 r [branch waveguides (connected at 31 f Branch waveguide +31 t'!, main, sub waveguide 11
The main and minor grooves [
fm (2:) is arranged in the longitudinal direction.

, Next, regarding the operation of the above-mentioned tube coupler, the wave with a frequency of 9 incident from the fc, for example, the main 4V + 11 terminal ■, is sent through the branch groove V tube (31) to the sub waveguide (2 ).At this time, since the single-branch waveguides +31 are arranged at a pitch interval of approximately the internal wavelength of the frequency f, this guide tube type coupler functions as a directional coupler. It has a function of fL, which is connected to the minor groove tL pipe (2) and comes out to the fL 7i!n 9μ terminal ■.

In addition, a branched waveguide 'fi 1 having a length of about % of the wavelength in the pipe
In contrast to the function of the 31, a large amount of fiB can be obtained even with a small number of branch guides, and the tS length is shorter than that of the porous type.

However, since the pitch interval of the branch conductor etta+ deviates from % of the snow slope length at frequencies other than the frequency of this conductor vt type knotter debo + fo, the directivity deteriorates. For this reason, there was a drawback that the directional frequency characteristic was a narrow band.

This invention is intended to eliminate this disadvantage.

Two ridge waveguides combined in a single shape are used as branch waveguides, and the drawings will be described in detail below.

Figure 2 μ is an example of this defense, 11+.

+21. I ~ IV (l Same as Figure 1, 14
1. f51r [branched groove tracheid;

The branch conduit 141.151 is a ridge conduit having a length of about % of the pipe wavelength at the center frequency f, and 1
They are combined in the shape of a letter 7 to form a set of branched conductive and fatigue groups.

The conductor tracheal coupler of this invention utilizes all the differences in the coupling characteristics between the one-branch sputum conductor (4) and the branch groove v'1#15+ to obtain the characteristics of a directional conduit. Vμ enters from the terminal I of the main wave tube 11+ and is coupled via the one-branch four-segment tube 141, and comes out to the terminals ■ and ■ with an electric field in the same direction. Branch groove e 'f for this RIC! When connected through +512, an electric field in the opposite direction appears at terminals ■ and y. Therefore, if the design is made so that the amount of coupling between the 9-branch waveguide (4) and the branch 4TFL blue i51 is equal, the V that appears at terminal ■ will be canceled out by 7L.
, he comes out with a connection to the terminal. In this way, this four-tube type coupler has the function of a directional ligator.

The waveguide type coupler of this invention has V″[, two branches 4′′
1141.151. Main t Sub 1) vltfl+, 1
Since 2 + 1 houses are installed at the same location, f
Directivity does not deteriorate even at frequencies other than o.

Also, 9-branch waveguide f41. Since +51 has the entire length of the wavelength inside the tube, it is possible to use a short tube as in the conventional V-type coupler.
FIG. 8 shows another embodiment of the present invention in which a large amount of binding can be obtained with a long length. 11+, +21.
+41.151. I ~ 1VrI Same as in FIG. 2.

The V-shaped lightning condenser of the present invention is equipped with a plurality of branch waveguides (4) and (5) combined in μ and T shapes.

By making the branch waveguide simple and carefully designing the pitch interval, it is possible to obtain not only directivity but also broadband characteristics in terms of reflection characteristics and coupling characteristics.

Although the main and minor groove pipes have been described above as multi-shaped guide pipes, this invention is not limited to IL, but can also be applied to circular guide pipes and semicircular guide pipes.

As described above, in the waveguide-type device according to the present invention, by using the two ridges as a 9-branch guide tube in combination with the kT-shaped ridge tube, it is possible to enjoy good directionality over a wide band. It has the advantage of being possible.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a conventional 24 & tube type coupler, Fig. 2 is a schematic diagram of the present invention's VC/B waveguide type coupler - the first embodiment of the present invention, and Fig. 8 is a schematic diagram of this invention. In the figure, which is a schematic configuration diagram showing another example of IM, fllr! led Osakakan,
+2111'ff auxiliary waveguide, +31.141 (51 is a branch waveguide. In Figure 1, the same or μ-corresponding parts are indicated by a with the same symbol.

Claims (1)

[Claims] In a branching waveguide type coupler in which two parallel waveguides are connected by a branching waveguide having a length of about % of the wavelength in the tube, two ridge-guided iT-shaped couplers are used as the branching waveguides. Combined with a coarse 64 tube type coupler.