JPS6373702A - Coaxial waveguide converter - Google Patents

Abstract

PURPOSE:To obtain an effective filter charactristic with the same size as a conventional converter by integrating a waveguide and a coaxial filter. CONSTITUTION:The coaxial filter 10 consists of an inner conductor 6 provided with a disk filter 5 coaxially and a dielectric 7 provided to cover the outer circumference of the inner conductor 6, the inner conductor 6 and the filter 5 are made of a copper or copper alloy, and the dielectric 7 is made by selecting a material having a desired dielectric constant among glass or 'Teflon(R)' or the like. The coaxial filter 10 is arranged in a form penetrating a prescribed guide wall of the waveguide 1. Thus, the same size as a conventional converter is adopted and excellent attenuation characteristic to a high band over the higher mode generating frequency or over is provided, then a radio wave trans mitted via the coaxial waveguide converter has an ideal transmission characteris tic whose band other than the operating band is cut off.

Description

[Detailed Description of the Invention] [Summary] The coaxial waveguide converter of the present invention incorporates a filter that provides attenuation characteristics in high bands into the coaxial section of the coaxial waveguide converter. By connecting the tube converter to an oscillator, amplifier, etc., it is possible to block unnecessary energy in high bands, such as spurious, without substantially impairing the characteristics of the used band.

[Industrial application field]

The present invention relates to an improvement of a coaxial waveguide converter used in connection with an amplifier 1 oscillator, etc., and in particular, improves the attenuation characteristics of high frequencies by integrating a filter and a coaxial waveguide converter. This invention relates to a coaxial waveguide converter.

[Conventional technology]

FIGS. 4(a) and 4(bl) are side sectional views of main parts showing the configuration of a conventional coaxial waveguide converter, and (a) is a horizontal conversion type.

Mountains) indicate vertical conversion types.

As shown in FIGS. 4(al) and 4(bl), the conventional coaxial waveguide converter consists of a coaxial line 14 that penetrates the wall of the waveguide 1, and an input/output connector. 4 and a connecting rod 6''.

Conversion between coaxial transmission and waveguide transmission is performed by magnetic field and electric field coupling via a 6° coupling rod.

Figure 5 shows the coaxial line 1 installed in the above coaxial waveguide converter.
FIG. 4 is a perspective view showing a structural example of No. 4;

As shown in FIG. 5, the conventional coaxial line 14 has a structure in which a dielectric material 7 is provided on the outer periphery of an internal conductor 6.

0 is the center of the inner conductor 6.

A material having a desired dielectric constant is selected from among the materials.

-Figure 6 (al,
(bl, (C) is a diagram showing the respective transmission characteristics of a coaxial line, a waveguide, and a coaxial waveguide converter.

In the coaxial line shown in FIG. 6 (al), the cutoff frequency F of the fundamental mode is determined by the interval between the inner conductor and the outer conductor (not shown), and the cutoff frequency F of the fundamental mode is usually used in a usage band M below that frequency.

In the case of the waveguide shown in FIG. 6(b), the low cutoff frequency F2 is determined by the inner diameter dimension, and the low band below this frequency is cut. Further, since a high-order mode occurs in a high band H of F3 or higher, the band M to be used in the basic mode is determined as shown in the figure.

FIG. 6(C) is a diagram showing the transmission characteristics of a coaxial four-wave tube converter made of the coaxial line and a waveguide. It will be determined by.

[Problem that the invention seeks to solve]

However, the transmission characteristics of a conventional coaxial waveguide converter that simply incorporates the coaxial line 14 into the waveguide 1 are the transmission characteristics of the coaxial line (Fig. 6 (a)) and the transmission characteristics of the waveguide. The transmission characteristic [Fig. 6(b)] is merged with the transmission characteristic, that is, the sixth
As shown in Figure (C), there are some frequencies that are easy to match in the high band. Therefore, if the waveguide converter is connected to a circuit that tends to generate harmonics, such as an oscillator or an amplifier, spurious waves may occur in the high band H.

[Means for solving problems]

The coaxial waveguide converter of the present invention constitutes a coaxial filter by an inner conductor coaxially provided with a disc-shaped filter, and a dielectric body disposed to cover the outer circumference of the inner conductor. In addition, the coaxial filter is arranged so as to penetrate a predetermined tube wall portion of the waveguide.

[Effect]

The coaxial waveguide converter configured in this way has the same size as a conventional converter, and as shown in the transmission characteristic diagram in Figure 1, the coaxial type filter has a higher-order mode generation frequency F1 or higher. Because it has good attenuation characteristics for the high band H of
This results in ideal transmission characteristics in which the low-bandwidth and high-bandwidth H) are cut.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiment figures.

2(al) and (b) are side sectional views of essential parts showing an embodiment of the present invention, and FIG. 3 is a perspective view of essential parts showing an example of the structure of a coaxial filter used in the present invention. 1 and 4 above
The same parts as in FIG. 5, FIG. 5, and FIG. 6 are given the same reference numerals.

As shown in FIGS. 2(a), (b) and 3, in the coaxial waveguide converter of the present invention, the coaxial filter 10 is arranged so as to penetrate through the wall of the waveguide 1. It is set up.

FIG. 2(a) shows a coaxial filter 10 mounted on the side wall of the waveguide 1.
FIG. 2(b) is an example of a vertical conversion type in which a coaxial filter 10 is placed on the upper wall of the waveguide.

The structure and materials used for the coaxial filter will be explained below with reference to FIG.

As shown in FIG. 3, the coaxial filter 10 includes an internal conductor 6 coaxially provided with a disc-shaped filter 5, and a dielectric 7 provided to cover the outer periphery of the internal conductor 6. It is configured. 0 is the internal conductor 6° filter 5. It is the central axis common to each of them.

The inner conductor 6. The filter 5 is made of copper or a copper alloy material, and the dielectric material 7 is made of a material having a desired dielectric constant from among glass, Teflon, and the like.

Note that the diameter d of the internal conductor 6 is formed to a size compatible with the connector 4.

In the figure, T indicates the thickness of the filter 5, and G indicates the distance between the outer circumferential surface of the filter 5 and the outer circumferential surface of the dielectric.

Depending on the characteristics of the coaxial filter 10, it is possible to provide attenuation characteristics not only in the high band H but also in the usage band M if necessary.

〔Effect of the invention〕

As described above, the coaxial waveguide converter of the present invention has an integrated structure of a waveguide and a coaxial filter, thereby achieving effective filter characteristics while maintaining the same size as a conventional converter. Obtainable.

[Brief explanation of the drawing]

Fig. 1 is a transmission characteristic diagram of the coaxial waveguide converter according to the present invention, Fig. 2 (al, (bl) is a side sectional view of the main part showing one embodiment of the present invention, Fig. 3 is a diagram configuring the present invention) A perspective view showing an example of the structure of a coaxial filter, Figures 4 (al) and (b) are side views of the structure of a conventional coaxial waveguide converter, and Figure 5 is a perspective view showing the structure of a conventional coaxial line. , Figure 6 (
a), (b), (C1 is a transmission characteristic diagram of a conventional coaxial waveguide converter. In the figure, 1 is a waveguide, 4 is a connector, 5 is a filter, 6 is an internal conductor, 6゛ is Coupling rod, 7 is a dielectric, 10 is a coaxial filter, 14 is a coaxial line, 15 is a coaxial cable, Fl is the cutoff frequency of the fundamental mode of the coaxial line, Ft is the low cutoff frequency of the waveguide, F is Higher-order mode generation frequency of the waveguide, L is low band, M is used band, H is high band,
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Claims (1)

[Claims] An internal conductor (
6) and a dielectric (7) disposed to cover the outer peripheral surface of the internal conductor (6) constitute a coaxial filter (10), and the coaxial filter (10) and the waveguide A coaxial waveguide converter characterized in that it is disposed so as to penetrate a tube wall portion of a tube (1).