JPH0247601Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Summary] When configuring a waveguide circuit such as a waveguide switch, mixer, or multiplier by attaching a diode to a waveguide, it is necessary to attach a diode to the waveguide so that the tip of the diode protrudes into the waveguide. Screw the adjustment screw perpendicular to the tube wall of the wave tube, mount the pill-shaped diode on the side of the tube wall opposite to the adjustment screw, and install the conductor post by passing it loosely through the axial hole of the adjustment screw. By connecting the tip of the conductor post to the electrode of the pill-shaped diode using a spring means provided on the head of the adjustment screw, the amount of protrusion of the adjustment screw into the waveguide can be adjusted with the conductor post and the pill-type diode connected. allows for adjustment.

[Industrial application field]

The present invention relates to an adjustment structure for a waveguide circuit such as a waveguide switch, mixer, or multiplier, in which a diode is attached to the waveguide.

In the microwave band or millimeter wave band, diodes are often attached to waveguides to construct waveguide circuits such as waveguide switches, mixers, and multipliers.

In such a waveguide circuit, it is necessary to adjust the impedance of the waveguide in order to compensate for the capacitance of the diode bag, the reactance of the lead, and the like.

[Conventional technology]

FIG. 3 is a side sectional view of a conventional example, and FIG. 4 is a detailed view of a pill type diode.

In FIG. 4, a pill-type diode 1 has a diode (for example, a PIN diode) 2 mounted at the center of the upper surface of an electrode 5.
The periphery is a ceramic ring 1A, and the upper part is packaged and sealed with another electrode 4. Also,
The diode 2 and the electrode 4 are connected by a lead 3 made of, for example, a gold wire.

In FIG. 3, an insertion hole 11 with a sufficiently large inner diameter is perpendicularly bored in the wall of the waveguide 10, and the insertion hole 11 is provided on the inner surface of the tube wall on the opposite side from the tube wall. A pill-shaped diode 1 is mounted at a position on the extension line of 11 with an electrode 5 in close contact with the electrode 5.

With an outer diameter sufficiently smaller than the inner diameter of the insertion hole 11,
The columnar conductor post 6 is inserted into the center of the insertion hole 11, and the hole provided on its tip surface is connected to the pill-shaped diode 1 by fitting into the boss provided on the upper surface of the electrode 4. .

A flange is formed on the upper part of the conductor post 6 that protrudes above the insertion hole 11 to serve as a spring holder for the lower end of the compression coil spring 7.

Then, a box-shaped support case 8 is fixed to the outside of the tube wall of the waveguide 10, an insulator 9 is fixed to the center of the ceiling plate of the support case 8, and the shaft hole of the insulator 9 is inserted into the conductor post 6. The upper part is penetrated to support the conductor post 6.

In addition, a compression coil spring 7 is installed between the insulator 9 and the collar of the conductor post 6, and the elasticity of the compression coil spring 7 constantly presses the conductor post 6 toward the pill-shaped diode 1. The connection between the conductor post 6 and the conductor post 6 is securely maintained.

In the waveguide circuit as described above, when the conductor post 6 is biased in the forward direction, the pill-shaped diode 1 becomes short-circuited, and the signal transmitted through the waveguide 10 is turned off. That is, the illustrated waveguide circuit has the function of a waveguide switch.

On the other hand, in the low frequency band, the diode characteristics match the voltage-current characteristics at the diode terminals, but in the microwave to millimeter wave bands, the diode characteristics of the pill-shaped diode 1 are the same as the capacitance of the package, They do not match due to the influence of the reactance of lead 3, etc. In addition, the capacitance of the package and the reactance of lead 3 are:
It is difficult to manufacture with high precision according to predetermined design values.

For this reason, conventionally, depending on the frequency band used,
By changing the thickness of the conductor post 6, or by making the inner wall of the waveguide before and after the conductor post 6 step-like as shown in FIG. 3 is corrected and matched with the impedance of the pill type diode 1.

[Problem that the invention attempts to solve]

However, the above conventional impedance adjustment means of changing the thickness of the conductor post or providing the impedance step converter 12 on the inner wall of the waveguide 10 requires modification of the conductor post 6 or the waveguide 10. However, there are problems in that the cost is high and adjustment is difficult.

[Means for solving problems]

In order to solve the above conventional problems, the present invention provides a screw hole 15 perpendicularly to the tube wall of the waveguide 10, as shown in FIG. The inserted adjusting screw 20 is screwed so that the tip thereof protrudes into the waveguide. Pill type diode 1
is mounted with the electrode surface of one electrode 5 in close contact with the inner surface of the tube wall on the opposite side from the adjustment screw 20.

Then, the conductor post 6 is loosely passed through the axial hole of the insulating tube 21, and the compression coil spring 7 attached to the recess 20B provided in the screw head 20A of the adjusting screw 20 connects the tip end surface to the other side of the pill-shaped diode 1. While maintaining the connection between the conductor post 6 and the pill-shaped diode 1 by tightly connecting it to the electrode of the
It is configured so that it can be adjusted by screw rotation.

[Effect]

According to the means of the present invention, when the adjusting screw 20 is screwed, the adjusting screw 20 is attached to the waveguide of the waveguide 10.
By adjusting the amount of protrusion of the tip of the waveguide 10, the impedance of the waveguide 10 is adjusted, and matching with the pill-shaped diode 1 can be achieved.

At this time, the head of the adjustment screw 20 moves up and down, but the conductor post 6 loosely passes through the axial hole of the insulating tube 21 inserted into the adjustment screw 20, and is attached to the screw head 20A. Since the compression coil spring 7 presses the pill-shaped diode 1 side, the state of connection between the conductor post 6 and the pill-shaped diode 1 does not change.

〔Example〕

The present invention will be specifically explained below with reference to the drawings. Note that the same reference numerals indicate the same objects throughout the figures.

FIG. 1 is a diagram of one embodiment of the present invention, in which a is a side sectional view, b is a front view, and FIG. 2 is a side sectional view of another embodiment of the present invention.

In FIG. 1, a screw hole 15 is provided perpendicularly to the wall of the waveguide 10, and an adjustment screw 20 with an insulating tube 21 inserted into the shaft center is inserted into the screw hole 15 so that its tip protrudes into the waveguide. It is screwed on.

The head of the adjustment screw 20 is formed into a screw head 20A having a larger outer diameter than the screw portion, and the screw head 20A is provided with a recess 20B that is open at the top, and an insulating cap 22 is screwed onto the inner wall of the recess 20B. It has a female thread.

The insulating cap 22 has a bottomed cylindrical shape with a ceiling plate portion, has a male screw threaded on its outer peripheral surface, and has a hole in the center of the ceiling plate portion through which the head of the conductor post 6 passes.

On the other hand, the waveguide 1 on the extension line of the axis of the insulating tube 21
A pill-shaped diode 1 is mounted on the inner surface of the tube wall of 0 with an electrode 5 in close contact with it.

A columnar conductor post 6 having a flange serving as a spring holder for the lower end of the compression coil spring 7 is loosely inserted into the axial hole of the insulating tube 21 at a desired position in the upper part, and a hole provided in the tip surface of the columnar conductor post 6 is inserted into the axial hole of the insulating tube 21. It is connected to the pill-shaped diode 1 by fitting into a boss provided on the upper surface of the electrode 4.

After attaching the compression coil spring 7 to the upper part of the collar, the insulating cap 22 is screwed onto the screw head 20A, and the conductor post 6 is constantly pressed toward the pill-shaped diode 1 by the elasticity of the compression coil spring 7. , which reliably maintains the connection between the electrode 4 and the conductor post 6.

When the conductor post 6 of the waveguide circuit as described above is biased in the forward direction, the pill-shaped diode 1 becomes short-circuited, and the signal transmitted through the waveguide 10 is turned off. That is, the illustrated waveguide circuit has the function of a waveguide switch.

In such a waveguide circuit, when the adjusting screw 20 is turned, the amount of protrusion of the tip of the adjusting screw 20 into the waveguide of the waveguide 10 is adjusted, and the impedance of the waveguide 10 is adjusted. Matching with pill type diode 1 can be achieved.

Note that after adjusting the adjusting screw 20,
The fixing nut 23 screwed onto the threaded part of the waveguide 10
The adjustment screw 20 is fixed by tightening it to the outside of the pipe wall.

In FIG. 2, the wall of the waveguide 10 has a first
The adjustment screw shown in the figure and the adjustment screw 20 of the same structure,
They are arranged in two stages, and the conductor post 6 is loosely inserted into the axial hole of the insulating tube 21 of each adjusting screw 20.

On the other hand, a screw hole 31 is provided in the tube wall on the opposite side from the adjustment screw 20 so as to face each conductor post 6, and a mount screw 3 that can be screwed into the screw hole 31 is screwed into the tube wall on the opposite side from the adjustment screw 20.
2 is screwed on.

A pill-shaped diode 1 is mounted on the tip end surface of a mounting screw 32 sunk into a screw hole 31, and the tip end surface of a conductor post 6 is connected to an electrode 4 of the conductor post 6. In such a two-stage waveguide switch, compared to when the pill-type diode 1 is in one stage,
When it is off, the signal is completely blocked.

The pill-shaped diode 1 mounted in a sunken position within the screw hole 31 has the function of a coaxial pipe, since the conductor post 6 and the inner wall of the screw hole 31 form a coaxial conversion section 30, as shown in FIG. Adjustment screw 20 as shown
Not only can the impedance of the waveguide 10 be adjusted with the mount screw 32, but also the impedance or tuning of the pill-shaped diode 1 can be adjusted in the coaxial conversion section 30 by turning the mount screw 32. can.

Note that the mount screw 32 is fixed using the fixing nut 3.
3.

The waveguide circuit adjustment structure of the present invention is not only effective when applied to waveguide switches as shown in the illustrated example, but also effective when applied to waveguide circuits such as mixers and multipliers. Of course.

[Effect of idea]

As explained above, the present invention is applicable to waveguide circuits such as waveguide switches, mixers, and multipliers in which pill-shaped diodes are mounted on the waveguide. An adjustment screw is installed perpendicular to the tube wall, making it easy to match the waveguide and pill-shaped diode, which not only improves the characteristics of the waveguide circuit, but also makes the configuration simple and low cost. etc., have excellent practical effects.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of one embodiment of the present invention, a is a side sectional view, b is a front view, Fig. 2 is a side sectional view of another embodiment of the present invention, and Fig. 3 is a side sectional view of a conventional example. 4 are detailed diagrams of the pill-type diode. In the figure, 1 is a pill-shaped diode, 3 is a lead, 4 and 5 are electrodes, 6 is a conductor post, 7 is a compression coil spring, 10 is a waveguide, 15 is a screw hole, 20 is an adjustment screw, and 21 is an insulation tube. , 22 is an insulating cap,
30 is a coaxial converter, 31 is a screw hole, and 32 is a mount screw.

Claims (1)

[Claim for Utility Model Registration] An insulating tube 21 is inserted into the axial center and screwed into a screw hole 15 provided perpendicularly to the tube wall of the waveguide 10 so that the tip thereof protrudes into the waveguide. Installed adjustment screw 20
, a pill-shaped diode 1 mounted on the tube wall side opposite to the adjusting screw 20 , and an adjusting screw 2 loosely passing through the axial hole of the insulating tube 21 .
By the spring means housed in the screw head 20A of 0,
A waveguide equipped with a diode, comprising a conductor post 6 which is pressed in the direction of the tube wall on the opposite side of the adjustment screw 20 and whose tip end surface is closely connected to the electrode of the pill-shaped diode 1. Adjustment structure of the circuit.