JP2000151224A - Coaxial waveguide converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coaxial waveguide converter capable of satisfactorily maintaining the conversion characteristic of a probe without rotating a dielectric supporting an inner shaft. SOLUTION: This converter consists of a waveguide 2 and a probe 3 which is arranged on the tube wall face of the waveguide 2 and is provided with an inner shaft 3a and a pillar-shaped dielectric 3b supporting the inner shaft 3a, in the dielectric 3b, the cross section of a pillar-shape part is rectangular and the long sides of a rectangle are arranged to be faced to the direction of the tube axis of the waveguide 2. The rectangular cross section of the pillar- shaped part is selected so that the length ratio of the long sides to the short sides can preferably be five to three.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coaxial waveguide converter, and more particularly to a coaxial waveguide converter comprising a waveguide and a probe disposed on a wall surface of the waveguide. The present invention relates to a coaxial waveguide converter having a rectangular cross-section for preventing rotation of an inner shaft and a dielectric when a connector connected to a probe is attached or detached.

[0002]

2. Description of the Related Art Generally, a converter for receiving a satellite broadcast is a coaxial waveguide converter comprising a waveguide for transmitting a received broadcast wave, and a probe for extracting a broadcast wave transmitted from the waveguide as a received signal. A signal processing unit connected to the probe for amplifying and frequency-converting the received signal and outputting the signal as an intermediate frequency signal; In this case, the probe and the signal processing unit are connected by connecting a connector to the distal end of the coaxial transmission line derived from the signal processing unit and attaching the connector to the probe.

FIGS. 2A and 2B are configuration diagrams showing an example of the configuration of a known coaxial waveguide converter 20. FIG. 2A shows a configuration of a waveguide in a probe arrangement portion. Cross section,
(B) is a side view of the waveguide of the same part.

As shown in FIGS. 2A and 2B, a coaxial waveguide converter 20 comprises a waveguide 21, a probe 22 disposed on the wall of the waveguide 21, and a waveguide 22. And a short-circuit surface 23 disposed at one end of the tube 21. The probe 22 includes an inner shaft 22a made of a conductive material and an inner shaft 22a.
and a columnar dielectric 22b supporting a. In this case, the probe 22 transmits one of the broadcast radio waves transmitted through the waveguide 21 from the short-circuit surface 23 disposed at one end of the waveguide 21.
It is provided at a position separated by ４ wavelength. Note that FIG.
Although not shown in (a) and (b), the connection between the coaxial waveguide converter 20 and the signal processing unit is performed by using a connector connected to the tip of a coaxial transmission line derived from the signal processing unit side. 22.

With this configuration, when a broadcast wave received in the waveguide 21 is transmitted, the broadcast wave is selectively extracted as a received signal by the probe 22,
The extracted received signal is supplied from the probe 22 to the signal processing unit through the coaxial transmission line, and the signal processing unit performs the above-described processing on the received signal.

[0006]

In the known coaxial waveguide converter 20, when the probe 22 is connected to the signal processing unit, it is connected to the tip of a coaxial transmission line derived from the signal processing unit. This is performed by attaching a connector to the probe 22. Since the dielectric 22b that supports the inner shaft 22a is cylindrical, the probe 22
When the connector is attached to the probe 2, the connector attached to the probe 22 is removed, or the like, the inner shaft 22 a and the columnar dielectric 22 may rotate with respect to the waveguide 21. There is a problem that a change occurs in the conversion characteristic, and in some cases, the probe 22 is mechanically damaged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to prevent the dielectric supporting the inner shaft from rotating and to maintain the conversion characteristics of the probe in a good condition. It is to provide a possible coaxial waveguide converter.

[0008]

To achieve the above object, a coaxial waveguide converter according to the present invention comprises a waveguide, a probe having an inner shaft and a columnar dielectric, and comprises a columnar dielectric. Is provided with a means in which the cross section of the columnar portion is rectangular and the long side of the rectangle is arranged in the tube axis direction of the waveguide.

According to the above means, since the probe has a dielectric having a rectangular cross section, the connector is attached to the probe or the connector attached to the probe is removed. In addition, the inner shaft and the dielectric do not rotate, so that the conversion characteristics of the probe do not change and the probe does not break mechanically.

According to the above means, when arranging the columnar dielectric having a rectangular columnar section in the waveguide in the waveguide, the long side of the rectangle is arranged in the direction of the tube axis of the waveguide. Therefore, the ratio of broadcast radio waves transmitted in the waveguide hitting the columnar dielectric and reflected is reduced, and a probe with good conversion characteristics can be obtained.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In an embodiment of the present invention, a coaxial waveguide converter is provided on a waveguide, a wall surface of the waveguide, and has an inner axis and a columnar dielectric supporting the inner axis. The columnar dielectric has a columnar section with a rectangular cross section, and is arranged such that the long side of the rectangle is oriented in the tube axis direction of the waveguide.

In a specific example of the embodiment of the present invention, in the coaxial waveguide converter, the ratio of the length of the long side to the short side of the cross section of the columnar portion of the dielectric is 5: 3. Things.

According to these embodiments of the present invention, in the probe, the columnar dielectric having a rectangular cross section is used for the columnar dielectric supporting the inner shaft, so that the connector is attached to the probe, or When the connector attached to the probe is removed, the inner shaft and the columnar dielectric do not rotate, and as a result, the conversion characteristics of the probe change or the probe is mechanically damaged. Thus, a coaxial waveguide converter having stable performance can be obtained.

Further, according to these embodiments of the present invention, when a columnar dielectric having a rectangular columnar section is disposed in a waveguide, the longer side of the rectangle is oriented in the tube axis direction of the waveguide. Because it is arranged to face, the broadcast radio wave transmitted in the waveguide hits the columnar dielectric, the ratio of reflection from it decreases,
A probe with good conversion characteristics can be obtained.

In this case, if the ratio of the length of the long side to the length of the short side in the rectangular cross section of the columnar portion is selected to be 5: 3,
A probe with optimal conversion characteristics can be obtained.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1A and 1B are diagrams showing the configuration of an embodiment of a coaxial waveguide converter according to the present invention.
(A) is a cross-sectional view of the waveguide at the probe arrangement portion, (b)
Is a side view of the waveguide of the same part.

As shown in FIGS. 1A and 1B, the coaxial waveguide converter 1 of the present embodiment is disposed on a circular waveguide 2 and on the wall surface of the circular waveguide 2. It comprises a probe 3 and a short-circuit surface 4 arranged to seal one end of the circular waveguide 2. The probe 3 includes an inner shaft 3a made of a conductive material, and a columnar dielectric 3b that supports the inner shaft 3a at a center portion and has a rectangular cross section. Also,
The position of the probe 3 on the waveguide 1 is
Is selected at a position separated from the short-circuit surface 4 sealing one end by 1/4 wavelength of the broadcast radio wave transmitted through the waveguide 2. The columnar dielectric 3b of the probe 3 has a long side and a short side of a rectangular section having a length of 5 to 3 in a cross section of the columnar portion, and is arranged so that the long side faces the tube axis direction of the waveguide 2. I have.

Although not shown in FIGS. 1A and 1B, like the known coaxial waveguide converter,
The coaxial waveguide converter 1 of the present embodiment and a signal processing unit that processes a received signal extracted from the coaxial waveguide converter 1 are connected to a distal end of a coaxial transmission line derived from the signal processing unit side. The connection is made by attaching the connector to the probe 3.

In the coaxial waveguide converter 1 according to the present embodiment having the above configuration, when a broadcast wave is received and the received broadcast wave is transmitted through the waveguide 2, the broadcast wave is selectively transmitted by the probe 3. It is extracted as a received signal. At this time, the extracted received signal is supplied to a signal processing unit through a coaxial transmission line connected to the probe 3, and the signal processing unit amplifies the received signal at a high frequency, converts the frequency of the amplified received signal, Next, signal processing such as intermediate frequency amplification of the frequency-converted signal is performed.

In this case, the coaxial waveguide converter 1 of the present embodiment
Is used as the columnar dielectric 3b for supporting the inner shaft 3a, the cross section of the columnar portion is rectangular, so that a connector is attached to the probe 3,
Alternatively, when the connector attached to the probe 3 is detached, the probe 3 does not rotate with respect to the wall surface of the waveguide 2, and as a result, the conversion characteristics of the probe 3 change or the probe 3 There is no mechanical damage.

The columnar dielectric 3b used in the coaxial waveguide converter 1 of the present embodiment is arranged so that the long side of the rectangular section of the columnar portion faces the tube axis direction of the circular waveguide 2. Therefore, since the broadcast radio wave transmitted through the circular waveguide 2 hits the short side of the rectangular cross section of the columnar dielectric 3b and is less reflected there, the conversion characteristic of the probe 3 is improved. Can be.

Further, the columnar dielectric 3b used in the coaxial waveguide converter 1 of the present embodiment is designed so that the ratio of the length of the long side to the short side of the rectangular cross section of the columnar portion is 5: 3. Because of the configuration, the conversion characteristics of the probe 3 become the best.

In the above embodiment, an example was described in which the circular waveguide 2 was used as the waveguide, but the waveguide used in the coaxial waveguide converter 1 of the present invention is circular. It is not limited to a waveguide, and may be another waveguide, for example, a rectangular waveguide.

In the above embodiment, the columnar dielectric is such that the ratio of the length of the long side to the short side of the rectangular cross section of the columnar portion is 5: 3. However, the columnar dielectric 3b used in the coaxial waveguide converter 1 of the present invention is not limited to the one having such a dimensional ratio of 5: 3, and the long side of the rectangular cross section is guided by the waveguide. The dimension ratio may be arbitrarily selected as long as it is arranged so as to face the tube axis direction of the tube 2.

[0026]

As described above, according to the present invention, a probe constituting a coaxial waveguide converter has a columnar section having a rectangular cross section as a columnar dielectric supporting an inner shaft. Therefore, when the connector is attached to the probe or the connector attached to the probe is removed, the inner shaft and the columnar dielectric do not rotate, and as a result, the conversion characteristics of the probe change. Alternatively, there is an effect that the probe is not mechanically damaged.

Further, according to the present invention, when a columnar dielectric having a rectangular columnar section is arranged in a waveguide, the long side of the rectangle is arranged in the tube axis direction of the waveguide. Therefore, there is an effect that a broadcast radio wave transmitted in the waveguide hits the columnar dielectric and the ratio of reflection therefrom is reduced, so that a probe having good conversion characteristics can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a configuration of an embodiment of a coaxial waveguide converter according to the present invention.

FIG. 2 is a configuration diagram illustrating an example of a configuration of a known coaxial waveguide converter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coaxial waveguide converter 2 Circular waveguide 3 Probe 3a Inner axis 3b Columnar dielectric 4 Short circuit surface

Claims (2)

[Claims] 1. A probe comprising a waveguide, a probe disposed on a wall surface of the waveguide and having an inner axis and a columnar dielectric supporting the inner axis, wherein the columnar dielectric has a columnar portion. Wherein the cross section of the coaxial waveguide is rectangular, and the long side of the rectangle is arranged in the tube axis direction of the waveguide. 2. The coaxial waveguide converter according to claim 1, wherein the ratio of the length of the long side and the length of the short side of the dielectric is 5: 3.