JPS5847301A - Choke flange device of waveguide - Google Patents

Abstract

PURPOSE:To realize the miniaturization of a choke flange device regardless of a low frequency of an electromagnetic wave, by filling a dielectric substance having insulating properties and a large dielectric constant into a line which forms a choke circuit of a choke flange. CONSTITUTION:A choke flange 103 and a cover flange 104 are attached at the edge part of waveguides 101 and 102 respectively to be matched with each other and connected with a bolt 105 and a nut 106 to join the waveguides 101 and 102 together. The inside of the waveguide is exhausted and evacuated to transmit an electromagnetic wave. A radial line 108 extending radially from the inside of the waveguide is provided between flanges 103 and 104. At the same time, a groove 109 having an end extending axially to link up with the line 108 along with the other end blockaded is formed at the flange 103. Thus a coaxial line 110 is obtained. A material 111 having insulating properties and a large dielectric constant is filled into the lines 108 and 110, and the lengths LAB and LBC of the lines 108 and 110 are set at 1/4 wavelength lambda1 of the electromagnetic wave. Then lambda1=lambda0/epsilon<1/2> is satisfied, where epsilon is the relative dielectric constant of the dielectric substance 111 and lambda0 is the length of an electromagnetic wave in vacuous atmosphere. In such way, the miniaturization is attained for a choke flange device of a waveguide.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a choke seven lunge device for joining waveguides.

Generally, a waveguide made of a metal cylinder is used for transmitting high-frequency electromagnetic waves. By the way, when such waveguides are joined, a loss occurs at the joint, so conventionally these waveguides were joined using a choke flange device as shown in Figure 1 to reduce the loss. It was composed of

That is, 1 and 2 are waveguides to be joined, and one end of the waveguide 1 has a choke flange 3. A force flange 4 is attached to the end of the other waveguide 2.

The choke flange 3 and the cover 7 flange 4 are brought into contact with each other. The waveguides 1 and 2 are connected by a seat 5 and a nut 6, thereby joining the waveguides 1 and 2.

A circular recess 7 is formed in the choke flange 3, and the choke 7 flange 3 and the cover 7 flange 4 are connected to each other.
The structure is such that a gap is formed between the two. One end of this gap, that is, the inner peripheral side thereof, opens into the waveguides 1 and 2, and this gap forms a radial line 8. Also,
An annular groove 9 is formed in the choke flange 3 along the axial direction, one end of the annular groove 9 communicates with the other end of the radial line 8, and the other end is closed. A coaxial line 10 is formed inside the groove 9. The lengths LAN and LI of these radial lines 8 and coaxial lines 10 are
C is set to % of the wavelength λ0 transmitted through the waveguides 1 and 2, respectively. A choke circuit is formed by the radial line 8 and the coaxial line 10, and the loss at this junction is reduced. That is, the electromagnetic waves transmitted within the waveguides 1 and 2 are introduced from one end of the radial line 8 into the radial line 8 and the coaxial line 10, and the introduced electromagnetic waves cause the choke 7 flange 3 and the cover flange A high frequency current is generated at -/4. By the way, the above LAW and Lmc are each λ. /4, the contact point B between the choke flange 3 and the cover flange 4 becomes the maximum voltage point of the voltage generated in the choke 7 run 3 and the cover 7 run 4, and no current flows. Therefore, the current flowing between the choke 7 and the cover flange 4 is zero, and the state is the same as if they were completely electrically connected and connected. Also,
Point A at one end of the radial line 8 is a voltage zero point, and at this point A, the choke flange 3 and cover 72 are actually connected.
Even though there is a gap between 4 and 4, the situation is the same as if there was a wall of the conductor at point A. Therefore, by providing the choke circuit composed of the radial line 8 and the coaxial line 10, the waveguides 1 and 2 maintain complete conduction and are joined in the same state as if they were joined without any gaps. , the loss at this joint can be reduced to almost zero.

By the way, the above LAN and Lmc must both be 4/λ, so when the wavelength λ of the electromagnetic waves transmitted in the waveguides 1 and 2 becomes large, these LAI * LIC
becomes large. For example, waveguides 1, 2° lanoal line 8.
When the inside of the coaxial line 10 is a vacuum and the frequency of the transmitted electromagnetic wave is 50 MHz, λ = 6.0 m, LAW
*Lmc and B are each 1.5m long. Therefore, when the frequency of the electromagnetic waves to be transmitted is in the Mtlz range, there is a problem in that this choke 7 lunge device becomes extremely large.

The present invention has been made based on the above circumstances, and its purpose is to provide a waveguide choke flange device that can be made compact even when the frequency of transmitted electromagnetic waves is relatively low. It's about getting.

In other words, the configuration of the present invention is to fill the lines constituting the choke circuit with a dielectric material made of a material having electrical insulation properties and a large permittivity, to reduce the wavelength of electromagnetic waves in these lines, and to reduce the length of these lines. Is it possible to use a choke flan even when the frequency of the electromagnetic waves being transmitted is low? ) The device can be made smaller.

The present invention will be explained in detail below.

2 and 3 show a first embodiment of the present invention, in which reference numerals 101 and 102 are waveguides. A choke 7 is attached to the end of one waveguide 101, and a cover flange is attached to the end of the other waveguide 102.
104 is attached. And these chalk 7
The flange 103 and the cup 9-flange 104 abut each other and are coupled by I-seats 105 and nuts 106, thereby joining the waveguides 101 and 102 to each other. The insides of the waveguides 101 and 102 are evacuated, and electromagnetic waves are transmitted through the waveguides 101 and 102. A circular recess 107 is formed in the choke flange 103, and an annular gap is formed between the choke flange 103 and the cover 7 runzo 104. The inner circumference of this gap is the waveguide 1
01, 102, and these waveguides 101, 102
It is formed into a radial line 108 extending radially from the inside. Further, an annular groove 109 is formed in the choke flange 103 and is oriented in the axial direction.
One end of 09 communicates with the other end of the radial line 108,
Also, the other end of this groove 109 is closed, and this #l1
109 is a coaxial line 1 which extends in the axial direction from the other end of the radial line 108 and whose other end is closed or electrically short-circuited.
10. And these radial lines 1
0B and the coaxial line 110 are filled with a dielectric 111 made of a material having electrical insulation properties and a high dielectric constant, such as a synthetic resin material.

Note that this dielectric material III is prepared by injecting an uncured or softened synthetic resin material into the radial line 108 and coaxial line 110 formed in the choke flange 103 and hardening it. is filled without any gaps. The length LAN of the radial line 108 and the length LBe of the coaxial line 110 are each set to be % of the wavelength λ1 of the electromagnetic wave within the dielectric 111.

The first embodiment of the present invention configured as described above has a waveguide 10.
Electromagnetic waves are transmitted within 1.102.

Then, this electromagnetic wave is introduced from one end of the radial line 108 into the radial line 10g and the coaxial line 110 at the junction of these waveguides 101 and 102,
This introduced electromagnetic wave generates a high frequency current within the choke 7 flange 103 and the cover 7 flange 104. Since the lengths LAW and LIC of the radial line 108 and coaxial line 110 are each set to λ1/4, the choke 7 flange 103 and the cover flange
) 104 is the maximum voltage point of the voltage generated in these choke 7 rungs 103 and cup 4-7 rungs 104, and no current flows. Therefore, the current flowing between the choke flange 103 and the cover 7 run 104 is zero, and the state is the same as if they were completely joined. Also, point A at one end of the radial line 108 is a voltage zero point, and even though there is actually a gap between the choke 7 flange 103 and the cover 7 flange 104 at point A, there is no conductor at this point A. The situation is the same as if a wall were present. Therefore, by providing the choke circuit composed of the radial line 108 and the coaxial line 110 in this way, the waveguides 101 and 102 maintain complete conduction and are joined in the same state as if they were joined without any gaps. The loss at this junction can be reduced to almost zero.

And the above-mentioned U-Sial line 108. Since the coaxial line 110 is filled with a dielectric 111, the waveguide 101
, 102, that is, in vacuum, is λ0
．． If the dielectric constant of the dielectric 111 is e, then inside the radial line 10B and the coaxial line 110, that is, the dielectric 11
This makes it the 21st wavelength company in Japan. Then, the radial line 10B and the coaxial line 1
Since the lengths LAW and Lmc of 10 are both 21/4, these LAN and Lmc are the radial line 10
B and 1//T when the coaxial line 110 is in a vacuum. Therefore, as long as the lengths of the radial line 108 and the coaxial line 110 are not short, such a choke flange device can be made compact, and even when the wavelength λ0 of the electromagnetic wave to be transmitted is long, the choke flange device can be made compact. be.

Note that the present invention is not limited to the first embodiment described above.

For example, FIGS. 4-6 show a second embodiment of the present invention.

This second embodiment is made of a dielectric body made of a material having electrical insulation properties and a large dielectric constant, such as alumina porcelain, steatite porcelain, beryllia porcelain, or porcelain using a titanium compound, and having a shape that matches the shapes of the radial line 108 and the coaxial line 110. 11
The dielectric body 112 is formed by forming a coating 112b made of a soft metal material such as copper on the entire surface of the dielectric body 112a except for the portions exposed inside the waveguides 101 and 102. It is composed of And this dielectric 11
2 into the radial line 108 and coaxial line 110, and the gels 105... and nuts 106.
... tightens the choke flange 103 and the cover 7 flange 104, compresses the dielectric 112, and brings the coating 112b attached to the surface of the dielectric 112 into close contact with the inner surfaces of the radial line 108 and the coaxial line 110. In the second embodiment, non-plastic materials such as ceramics can be used for the dielectric body 112m, and the entire choke flange device can be further miniaturized. That is, the above-mentioned alumina porcelain, steatite porcelain, beryllia porcelain, etc. have a relative dielectric constant 8 of 6 to 7, and porcelain using a titanium compound has a relative dielectric constant 1 of 102 to 10''. The length of radial and coaxial lines can be significantly reduced by using materials as dielectrics.However,
Since these materials do not have plasticity, they cannot be filled into radial lines or coaxial lines without any gaps. However, according to this second embodiment, the coating 1 on the surface of the dielectric body 1121
12b is deformed and becomes a radial line 108 or a coaxial line 110.
These materials adhere closely to the inner surface of the radial line 108.
It is possible to fill the inside of the coaxial line 110 without any gaps, and the length of the radial line 10B and the coaxial line 111 can be significantly shortened, thereby making it possible to further downsize the choke 7 lunge device.

Further, FIG. 7 shows a third embodiment of the present invention.

In this third embodiment, a part of the inner peripheral surface of the choke 7 flange 103 is enlarged in diameter, and a cylindrical shape 5113 is provided axially protruding from the inner peripheral surface edge of the cover flange 104, and the above-mentioned First line 108 corresponding to the radial line of the embodiment
', and the nine choke 7 lunges 103 have the above first
A coaxial second line II0', which corresponds to the coaxial line of the embodiment described above, is bent and communicated with the zero line 108', and these first and second lines 10g'.

110' is filled with dielectric material 111'.

In this third embodiment, the first and second lines 10B'
, 110' are arranged coaxially, the diameters of the choke flange 103 and the cup flange 104 can be reduced, and the entire choke flange device can be further downsized.

As described above, the present invention fills the lines constituting the choke circuit with a dielectric material made of a material having electrical insulation properties and a large dielectric constant, reduces the wavelength of electromagnetic waves in these lines, and reduces the length of these lines. This is an abbreviation of ``. Therefore, even if the transmitted electromagnetic waves have a low frequency and a long wavelength, the choke 72 device as a whole can be made smaller, which has great effects.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a conventional example. 2 and 3 show a first embodiment of the present invention, FIG. 2 is a side cross-sectional view, and FIG.
The figure is a sectional view taken along line 1-1 in FIG. 2. 4 to 6 show a second embodiment of the present invention, FIG. 4 is a longitudinal sectional view, FIG. 5 is a longitudinal sectional view of a dielectric, and FIG. 6 is a -
■It is an arrow view. Moreover, FIG. 7 is a longitudinal sectional view of the third embodiment of the present invention. 101.102...Waveguide, 103...Choke 7
Lunge (Fran X)), 104...Cover 7 Lunge (
flange), 108... radial track (first track)
, 110... coaxial line (second line), 111...
Dielectric, 112...Dielectric, 112a...Dielectric body, 112b...Coating, 108'...First line island 110'...Second line. Applicant's representative Patent attorney Takehiko Suzue Figure 1 56 Figure 3 05 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] (1) At each end of a pair of waveguides to be joined to each other, 7
The waveguides are joined by providing flanges and abutting the flanges, and a gap is provided between the seven flanges with one end opening into the waveguide to form a first line, and one end is opened into the waveguide. The seven lunges form a second line whose one end communicates with the other end of the first line and whose other end is closed, and the first line and the second line have electrical insulation properties. The first line and the second line are filled with a dielectric made of a material with a high dielectric constant.
A choke flange device for a waveguide, characterized in that the lengths of the lines are each formed to correspond to the wavelength oh in the dielectric of the electromagnetic waves transmitted in the waveguide. (Li) The choke 7 langage of the patented waveguide, characterized in that the dielectric body is made of a dielectric material and a soft metal material is coated on the surface of the dielectric body except for the portion exposed inside the waveguide. Apparatus. (3) The first line and the second line are both annular grooves formed concentrically with respect to the center of the waveguide. The waveguide choke 7 lunge device according to item 1.