JPH01189203A - Waveguide-microstrip line converter - Google Patents

Abstract

PURPOSE:To facilitate a fitting and a removing at the time of switching to a microstrip line having the other pattern form by sticking the microstrip line to compose an antenna part to a carrier and causing the carrier to be mountable and dismountable to a case body. CONSTITUTION:A tip part is projected in a waveguide 32, a microstrip line 48 to play the role of an antenna is stuck to a carrier 40, thereafter, the carrier 40 is fitted in a recessed part 36 formed in the joining part of a case body 30 and the waveguide 32, and thereby, the carrier 40 can be mountably and dismountably fitted. Consequently, the works of switching the microstrip line 48, etc., at the time of the damage and mismatching of the microstrip line 48 or at the time of using a converter with other frequencies can be facilitated. A time necessary for heating can be shortened, the case body 30 cannot be heated, and adverse effects cannot be given to other circuits, etc.

Description

[Detailed Description of the Invention] Overview Regarding a converter between a waveguide and a microstrip line used as a transmission line for microwaves, etc., the microstrip line has its tip protruding into the waveguide and serves as an antenna. The purpose is to provide a waveguide-micro strip line converter that can be easily installed and replaced by having a removable structure. A waveguide-microwaveguide constructed by forming a window in a short-circuited waveguide, and providing a microstrip line with a pattern formed on the tip so that the tip protrudes into the waveguide through the window. - In the strip line converter, a recess is formed in the vicinity of the joint of the casing with the waveguide, a carrier that fits into the recess is detachably provided, and the microstrip line is attached to the carrier. Configure.

FIELD OF THE INVENTION The present invention relates to a converter between a waveguide and a microstrip line used as a transmission line for microwaves and the like.

Special transmission lines such as coaxial lines and waveguides are used as microwave transmission lines in order to transmit microwaves with less loss and distortion. Due to their basic shapes, transmission lines consisting of coaxial lines, waveguides, etc. have to be three-dimensional, and there are restrictions on miniaturization, weight reduction, and ω production.

Therefore, recently, microstrip lines, which can be manufactured by applying IC technology and printed wiring board pattern forming technology that have rapidly developed in recent years, have also been used as microwave transmission lines.

Waveguides are used, for example, as power transmission lines between transceivers and antennas because they have low transmission loss and can transmit large amounts of power. Although it is not necessarily appropriate to use microstrip lines due to the fact that they are small, have a wide frequency band, and are easy to couple with semiconductor devices, they are inferior in terms of transmission loss and transmission power. many.

For this reason, a line converter is required to connect the waveguide to a circuit composed of a microstrip line, and there is a demand for an efficient line converter with low loss.

BACKGROUND OF THE INVENTION FIGS. 2 and 3 are diagrams showing an example of a conventional waveguide-to-microstrip line converter. 10 t, t 1
There are two parts, and 12 is a waveguide which is a connection line to an antenna or other equipment. The waveguide 12 is formed integrally with the housing 10, and its lower end surface 12a is short-circuited. A window 14 is formed in the center of the waveguide 12 on the side of the housing 10 .

Reference numeral 16 denotes a micro-conductor on which a strip conductor 20 is formed on an Lf1 body substrate 18 surface made of alumina ceramics or the like.
It is a strip line, and a micro strip line 16
At one end, there is a pattern 2 continuous to the strip conductor 20.
2 is formed. The pattern 22 has various shapes, such as the shape shown in FIG. 3, for example. Characteristics such as matching between the waveguide and the microstrip line are influenced by the size and shape of this pattern 22.

The other end of the microstrip line 16 is connected to another microstrip line on which a detection circuit, an amplification circuit, etc. using a semiconductor element (not shown) is formed.

The microstrip line 16 is conductive in a groove 24 formed on the top surface of the housing 10 so that one end on which the pattern 22 is formed projects vertically into the waveguide 12 through the window 14 of the waveguide 12. It is attached using adhesive or gold-tin alloy. The pasting work is done by heating the housing 10 (approximately 300
°C), by melting the adhesive, etc.

Problems to be Solved by the Invention However, in the conventional waveguide-to-microstripline converter as described above, when attaching the microstripline to the housing, the housing is heated and adhesive, etc. Because this is done by melting the microstrip line, there is a risk that it will have an adverse effect on the semiconductor elements if a circuit consisting of a semiconductor element, etc. is installed on the casing. Since the microstrip line is fixed to the microstrip line, there is a problem in that it is difficult to replace it when the microstrip line is damaged or when the shape of the pattern does not match and alignment is not successful.

Further, a similar problem occurs when changing the frequency band due to a change in specifications or the like.

The present invention has been made in view of these points,
The purpose of this is to create a waveguide that can be easily installed and replaced by constructing a microstrip line with its tip protruding into the waveguide and removably serving as an antenna. An object of the present invention is to provide a micro-stripline converter.

Means for Solving the Problems A window 34 is formed in the waveguide 32 which is provided integrally with the casing 30 and whose one end surface 32a is short-circuited, and the casing 30
A recess 36 is formed near the joint with the waveguide 32, and a carrier 40 that fits into the recess 36 is detachably provided.

Microstrip line 4 with pattern 54 formed
8 to the carrier 40 and the carrier 40 is attached to the housing 30, the tip of the microstrip line 48 protrudes into the waveguide 32 through the window 34, thereby solving the above-mentioned problem. Solve the points.

Function According to the present invention, the micro-strip line 48 whose tip part protrudes into the waveguide 32 and serves as an antenna is attached to the carrier 40 and then detachably attached to the housing 30. This facilitates operations such as replacement of the microstrip line 48 when the microstrip line 48 is damaged, mismatched, or when the converter is used at a different frequency.

Furthermore, since the microstrip line 48 is attached to the carrier 40 and then attached to the casing 30, the time required for heating is shortened, work efficiency is improved, and the casing 30 is not heated. There is no adverse effect on other circuits etc. provided on 30.

Furthermore, by optimizing the micro-strip line attached to the carrier using another measuring device, etc., and attaching the adjusted line to the converter, it is possible to improve layer efficiency.

EXAMPLES The present invention will be explained in detail below based on the drawings.

FIG. 1 is a partially cutaway perspective view of an embodiment of the present invention.

30 t, t In body, 32 is a waveguide which is a connection line with an antenna or other equipment, and the waveguide 32 is connected to the housing 3.
0 and is made of metal such as brass, and its lower end surface 32a is short-circuited. waveguide 32
A window 34 is formed in the center of the housing 30 side.

There is a step 3 near the joint between the housing 30 and the waveguide 32.
A recess 36 having 6a, 36'b is formed, and a screw hole 38, 38 is formed in the recess 36.

40 is a carrier made of brass or the like, and its lower part is formed to fit into the recess 36 and the steps 36a and 36b, and holes 40a and 40a are formed at both ends thereof.
40a is formed, and can be detachably attached to the recess 36 of the housing 30 with screws.

42 is a dielectric substrate 44 made of alumina ceramics or the like.
It is a micro-strip line in which a strip conductor 46 made of a conductor such as gold is formed on the upper surface, and a detection circuit, an amplifier circuit, etc. made of semiconductor elements (not shown) are formed at the broken end of the micro-strip line 42. connected to other microstrip lines. 48 is a micro strip line that constitutes the antenna section;
Similar to the micro strip line 42, a dielectric substrate 50
A strip conductor 52 is formed on the upper surface of the wafer, and a pattern 54 is formed continuously to the strip conductor 52. Depending on the size and shape of this pattern 54, the waveguide 3
2 and the microstrip line 48, 42.

The microstrip line 42 and the microstrip line 48 are heated and applied to a groove 56 formed on the top surface of the casing 30 and a groove 58 formed on the top surface of the carrier 40 with conductive adhesive or gold-tin alloy, respectively. It is pasted. The shaped ends of the pattern 54 of the microstrip line 48 affixed to the carrier 40
0 into the recess 36 of the housing 30 with screws, it projects vertically into the waveguide 32 through the window 34 of the waveguide 32. The carrier 40 is inserted into the recess 36 of the housing 30.
When installed on each microstrip line 42.
The strip conductors 46 and 52 on 48 are crimped at both ends of a gold ribbon or the like to provide electrical continuity.

According to this embodiment, the antenna part 48 of the microstrip line is attached to the removable carrier 40 and then attached to the housing 30, so when the converter is used at a different frequency or there is a mismatch. In such cases, the micro strip line 48 that constitutes the antenna section can be easily replaced,
In addition, since it is sufficient to heat the carrier 40 when pasting it, heating does not adversely affect other circuits formed on the casing 30, and the time required for heating is shortened. Improves work efficiency.

Note that the steps 36a and 36b are formed at the fitting portion of the carrier 40 and the recess 36 of the housing 30 because when the carrier 40 is attached to the recess 36, a phase difference occurs in the microwave due to the gap. This is to reduce deterioration of its characteristics. That is, since the housing 30 and the carrier 40 overlap at the stepped portion, no phase difference occurs in the microwaves.

Effects of the Invention As described in detail above, the present invention has a structure in which the micro-strip line constituting the antenna section is attached to the rear of the key 17, and this carrier is detachably attached to the housing, so that the antenna section can be configured. If the microstrip line to be used is damaged or its integrity is poor, or if the customer wants to change the frequency band of the converter, it becomes necessary to replace the microstrip line with a microstrip line with a different pattern shape. This has the effect that it can be easily installed and removed.

Furthermore, since the micro-strip line is attached to the carrier and then attached to the casing, heating only occurs in the carrier, which does not adversely affect other circuits on the casing. Another effect is that the time required is shortened and the efficiency of assembly work etc. can be improved.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of an embodiment of the present invention, Fig. 2 is a partially cutaway perspective view of a conventional technique, and Fig. 3 is a pattern shape formed on a microstrip line that serves as an antenna. It is a figure showing an example. 30... Housing, 32... Waveguide, 36... Recess, 40... Carrier, 42.48... Micro strip line. 32 ・JF Tosuga 36 Two-concave eaves 40, Carrier 42148 ° Micro Street, F・*pv+54
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Claims (1)

[Claims] Provided integrally with the casing (30), with one end surface (32a)
) forms a window (34) in the short-circuited waveguide (32);
A waveguide comprising a microstrip line (48) having a pattern (54) formed at its tip so that the tip protrudes into the waveguide (32) through the window (34). In the micro-strip line converter, a recess (36) is formed in the vicinity of the joint of the casing (30) with the waveguide (32), and a carrier (40) fitted in the recess (36) is attached and removed. A waveguide characterized in that the micro-strip line (48) is freely provided and is configured by adhering the micro-strip line (48) to the carrier (40).
Micro strip line converter.