JPH02228801A - Connection structure of microwave unit - Google Patents

Abstract

PURPOSE:To improve the propagation characteristic and the transmission impedance and to evade damage to the unit by providing a slot to each side wall of a metal carrier forming a gap and inserting both slots of a plate spring and bridging the gap. CONSTITUTION:A slot 30 orthogonal to a strip line 10 and opened at a side wall face is provided to each of a side wall 21 of a metallic carrier forming a gap 20. Then both side ridges of a plate spring 31A in the lengthwise direction are inserted to each of slots 30 opposite to each other to make the plate spring 31A in elastic contact onto the upper inner wall of the slot 30 thereby connecting both metallic carriers 6 electrically via a plate spring 31A. Thus, the gap between a conductor ribbon 11 and the plate spring 31A as a ground conductor is decreased, the production of the resonance in a transmission broad band is blocked to improve the propagation characteristic. Moreover, the size of the gap 20 is made narrow to improve the transmission impedance and no stress is exerted to a dielectric base 7 and the possibility of the damage to the dielectric base 7 is precluded.

Description

[Detailed Description of the Invention] C Summary] This invention relates to a microwave communication device, and particularly to a connection structure of microwave units arranged on a flat base, which improves propagation characteristics and transmission impedance, and prevents damage to the microwave units. With the aim of providing a connection structure for a microwave unit that is fear-free, the microwave unit, which is made by adhering a dielectric substrate with a microwave circuit or microwave transmission line to a metal carrier, is mounted on a flat base. A plurality of conductor ribbons are arranged in the microwave unit and bridge the gap between the microwave units.
In a circuit module configured to connect the adjacent microwave units by connecting both opposing strip lines, on each side wall of the metal carrier constituting the gap, perpendicular to the strip lines,
In addition, a groove is provided that opens in the side wall surface, and both edges in the longitudinal direction of the leaf spring are arranged such that the upper surface is in elastic contact with the upper inner wall of the groove at a position directly below the strip line when the longitudinal direction is bent in an arc shape. are inserted into and attached to both grooves, respectively, and the leaf spring is bridged in the gap.

[Industrial application field]

The present invention relates to a microwave communication device, and particularly to a connection structure for microwave units arranged on a flat base.

FIG. 3 is a diagram of a circuit module widely used in microwave communication devices, in which (a) is a plan view and (b) is a side sectional view. Further, (C) is a sectional view of a circuit module having peripheral connection circuits.

In FIGS. 3(a) and 3(b), reference numeral 5 indicates a microwave circuit 8 or a microwave transmission line (not shown) provided on the surface of a dielectric substrate 7 made of alumina or the like, and on the back surface of the dielectric substrate 7. This is a microwave unit which is mounted on the top surface of a metal carrier 6 by soldering.

By accommodating a desired number of such microwave units 5 in the metal case 1 and arranging and connecting them in series, a circuit module having desired functions such as an amplification function 1 and a frequency conversion function is constructed.

To be more specific, in order to connect the respective microwave units 5, strip lines 10 with terminals reaching the side edges are provided on each dielectric substrate 7 to face each other. Then, the microwave units 5 are arranged in a row with the bottom surface of the metal carrier 6 brought into close contact with the flat base 3 constituting the bottom plate of the metal case 1 so that the strip lines 10 face each other on the same plane. Both side edge portions of each metal carrier 6 are fixed to the flat base 3 using machine screws 9.

At this time, it is inevitable that a gap 20 is created between the microwave units 5, although the width is small, but the height is approximately equal to (the thickness H of the metal carrier + the thickness of the dielectric substrate).

Therefore, at the terminals of the opposing strip lines 10,
For example, the ends of conductor ribbons 11 such as gold ribbons are overlapped and bonded by thermocompression bonding or the like, and the conductor ribbons 11 are bridged above the gap 20 to connect adjacent microwave units.

Further, a coaxial connector 13 is attached to the side wall of the metal case 1, and its center conductor is connected to the strip line 10 of the microwave unit 5 at both ends, thereby connecting an external device and the circuit module.

On the other hand, a lid 2 made of a metal plate is attached to the opening of the metal case 1 to electrically shield the microwave unit 5.

In addition, metal case 1. Copper, brass, etc. are used as materials for the lid 2 and the metal carrier 6, and the metal carrier 6 is further plated with gold.

Further, the thickness of the dielectric substrate 7 is 0.4 mm to 0.6 mm.

In the microwave unit shown in FIG. 3(C), a recess is provided on the back side of the metal carrier 6 facing the dielectric substrate 7, and a circuit board comprising a peripheral connection circuit 15 such as a bias circuit is placed in the recess. It is installed.

The microwave circuit constructed on the dielectric substrate 7 and the peripheral connection circuit 15 are connected via a terminal 16 that insulates and penetrates the metal carrier 6.

As described above, the microwave unit 5 having the peripheral connection circuit 15 requires a recess for accommodating the peripheral connection circuit 15, so the thickness of the metal carrier 6 is increased, and the upper surface of the ground conductor, that is, the flat base 3, Even in the conductor rib, as mentioned above, it is inevitable that the gap 20 will be formed between the microwave units 5.

The height of this gap 20 influences the propagation characteristics of the transmitted signal.

That is, if the height of the gap 20, or more precisely, the plate thickness H of the metal carrier below the dielectric substrate 7, is equal to 174 of the wavelength of the signal transmitted through the conductor ribbon 11, the transmission signal will resonate at that wavelength. The propagation characteristics of are greatly degraded.

Therefore, in a high frequency and broadband circuit module, the distance between the transmission line of the microwave unit 5 and the ground conductor (if there is a gap, the bottom of the gap 20, that is, the top surface of the flat base 3 becomes the ground conductor) is It is required to be sufficiently small.

[Conventional technology]

Therefore, conventionally, the propagation characteristics have been improved as shown in FIG. 4 or FIG. 5.

In what is shown in FIG. 4, the side walls of both metal carriers 6 of the microwave unit 5 are formed into stepped side walls 22 with shapes that are inverted from each other. That is, the side cross section of the central metal carrier 6B is formed in an inverted convex shape, and the left and right metal carriers 6A are formed in a convex shape.

Each microwave unit 5 is fixed to the flat base 3 with the step end surfaces of the central metal carrier 6B superimposed and in close contact with the step end surfaces of the left and right metal carriers 6A.

By doing as described above, adjacent metal carriers 6 are electrically connected to each other at a desired position higher than the upper surface of the flat base 3.

That is, since the distance between the conductor ribbon 11 and the ground conductor is equivalently reduced, resonance within the transmission band is prevented from occurring.
Propagation characteristics are improved.

At this time, the bottom surface of the metal carrier 6B must be floating above the top surface of the flat base 3 in order for both step end surfaces to come into close contact with each other when the microwave unit is attached to the flat base 3. Therefore, the thickness of the metal carrier 6B has to be made smaller than that of the other metal carriers 6A.

In the one shown in FIG. 5, a leaf spring 23 made of, for example, phosphor bronze and having an inverted U-shaped cross section is inserted into each gap 20.

By doing so, adjacent metal carriers 6 are electrically connected via the leaf springs 23 at a desired position higher than the upper surface of the flat base 3.

In other words, the distance between the conductor ribbon 11 and the ground conductor is equivalently small, so resonance within the transmission band is prevented from occurring.
Propagation characteristics are improved.

[Problem to be solved by the invention]

However, in the former of the above conventional examples, that is, in which the side walls of the metal carrier are stepped side walls, machine screws 9 are inserted into holes on both side edges of the metal carrier, and the metal carrier is attached to the flat base 3.
When the metal carrier 6B is fixed to the metal carrier 6B, the bottom surface of which is floating above the flat base, the metal carrier 6B warps upward in a convex manner, so that stress is applied to the dielectric substrate 7.

Due to this, there was a problem in that the dielectric substrate 7 was broken or cracked.

In addition, since the cross-sectional shapes of the metal carriers are of two types, an inverted convex shape and a convex shape, there is no commonality, and there is a risk that the cost of the metal carriers will be high.

On the other hand, the latter, that is, the one in which the leaf spring 23 is inserted into the gap,
Due to the manufacturing precision of the leaf spring 23, it has been difficult to uniformly bring all sides of the leaf spring 23 into contact with the side wall 21.

This lowers the reliability of electrical continuity between both metal carriers directly under the transmission line, that is, the conductor ribbon 11, and there is a fear that the propagation characteristics will not be improved as desired.

Moreover, in order to insert the leaf spring 23, the width of the gap 20 becomes larger, and the length of the conductor ribbon 11 becomes longer, which may deteriorate the transmission impedance.

The present invention was created in view of the above points, and an object of the present invention is to provide a connection structure for a microwave unit that has improved propagation characteristics and transmission impedance, and that does not cause damage to the microwave unit. .

[Means to solve the problem]

To achieve the above object, the present invention provides a microwave system in which a dielectric substrate 7 provided with a microwave circuit 8 or a microwave transmission line is adhesively mounted on a metal carrier 6, as illustrated in FIG. By arranging a plurality of units 5 on a flat base 3 and connecting both opposing strip lines 10 via a conductor ribbon 11 bridging the upper part of the gap 20 between the microwave units, adjacent microwave units In a circuit module configured to connect between
Each side wall 2 of the metal carrier 6 forming the gap 20
1 is provided with a groove 30 that is perpendicular to the strip line IO and that opens on the side wall surface.

Then, it is bent upward in a convex arc shape so that the upper surface comes into elastic contact with the upper inner wall of the groove 30 at a position directly below the strip line 10.
Both edges of the leaf spring 31A in the longitudinal direction are inserted into and attached to both grooves 30, respectively, and the leaf spring 31A is bridged in the gap 20.

[Effect]

The above-described leaf spring 31^ is bent in an upwardly convex arc shape, and its upper surface is in elastic contact with the upper inner wall of the groove 30 at a position directly below the strip line 10. That is, the metal carriers 6 of both microwave units 5 are electrically connected via the leaf spring 31A.

Therefore, the transmission line (conductor ribbon 11) and the ground conductor (
The distance from the plate spring 31A) can be made as small as desired, and resonance is prevented from occurring within a wide transmission band, improving propagation characteristics.

Moreover, since there is nothing that prevents the narrowing of the width of the gap 20 between adjacent microwave units 5, the gap width can be made as small as desired until both side walls 21 are almost in contact with each other.

That is, the length of the conductor ribbon 11 is shortened, and the transmission impedance is improved.

Note that the microwave unit 5 is fixed to the flat base 3 with the bottom surface of each metal carrier 6 in close contact with the flat base 3. Therefore, when fixing the microwave unit 5 or due to subsequent changes in the environmental temperature,
No stress is applied to the dielectric substrate 7.

That is, the fear of damaging the dielectric substrate is eliminated.

〔Example〕

The present invention will be specifically described below with reference to the drawings. Note that the same reference numerals refer to the same objects throughout the plan.

FIG. 1 is a diagram of one embodiment of the present invention, in which (a) is a perspective view of a main part, (b) is a sectional view, and FIG. 2 is a sectional view of another embodiment of the present invention.

In FIG. 1, microwave circuit 8. Alternatively, a microwave transmission line (not shown) is provided on the surface of a dielectric substrate 7 made of alumina or the like, and the back surface of the dielectric substrate 7 is connected to a metal carrier 6.
The microwave unit 5 is installed by brazing on the top surface.
It consists of:

In addition, strip lines 10 whose terminals reach the side edges are provided facing each other on each dielectric substrate 7, and are attached to the microwave units 5 arranged next to each other, or to the microwave units 5 and the side wall of the metal case 1. coaxial connector 13
I'm trying to connect the .

A desired number of microwave units 5 configured as described above,
The metal carriers 6 are arranged and housed in a line in a metal case 1, and the bottom surface of each metal carrier 6 is brought into close contact with a flat base 3 that constitutes the bottom plate of the metal case 1, and is fixed to the flat base 3 using machine screws 9. .

In addition, the ends of the conductor ribbons 11 such as gold ribbons are overlapped with the ends of the strip line 10 and bonded by thermocompression bonding or the like, and the conductor ribbons 11 are wired by bridging the upper part of the gap 20, and the adjacent microwave unit 5 Connecting like-minded people.

In the circuit module configured as described above, the present invention provides that the opposing side walls 2 of the metal carrier 6 constituting the gap 20
1, a groove 30 is provided at a height close to the dielectric substrate 7, perpendicular to the strip line 10, and opening at the side wall surface.

Reference numeral 31 is a temporary spring in the form of an elongated rectangle made of, for example, a thin phosphor bronze plate, the length of which is sufficiently longer than the width of the metal carrier 6, and machine screws 32 are inserted into both ends thereof. It has holes.

Then, both edges of the leaf spring 31A in the longitudinal direction are inserted and passed through each of the opposing grooves 30 to divide the gap 20 into two upper and lower spaces by the leaf spring 31A, and then provided at both ends of the leaf spring 31A. A machine screw 32 is inserted into each of the holes formed in the flat base 3, and the machine screw 32 is screwed into the tapped hole of the flat base 3.

Since the leaf spring 31A is mounted in this manner, both ends of the leaf spring 31A are pressed against the head of the machine screw 32, and the leaf spring 31A is mounted in a state in which it is elastically deformed into an upwardly convex arc shape.

Therefore, the upper surface of the longitudinal side edge of the leaf spring 31A is
Each groove 30 is located directly below the strip line 10.
It is in elastic contact with the upper inner wall. Note that the elastic contact at such a position means that the groove 30. This is not affected in any way by the processing accuracy of the leaf spring 31A.

That is, both metal carriers 6 are electrically connected via the leaf spring 31A at a position directly below the conductor ribbon 11. Therefore, the conductor ribbon 11 and the leaf spring 31A as a ground conductor
It is possible to reduce the distance between the two antennas as desired, thereby preventing resonance from occurring within a wide transmission band and improving propagation characteristics.

Further, unlike the conventional example, a leaf spring is not simply inserted into the gap 20, so there is nothing that prevents the width of the gap 20 between adjacent microwave units 5 from being narrowed. Therefore, the microwave unit 5 can be brought close to each other and fixed to the flat base 3 until the side walls 21 of both metal carriers 6 are almost in contact with each other.

That is, the length of the conductor ribbon 11 is shortened, and the transmission impedance is improved.

Furthermore, stress is not applied to the dielectric substrate 7 when the microwave unit 5 is fixed or due to subsequent changes in environmental temperature, so there is no risk of damage to the dielectric substrate 7.

Furthermore, since the grooves 30 are symmetrically provided in each of the metal carriers 6, the metal carriers 6 have commonality, and an increase in cost can be suppressed.

The embodiment shown in FIG. 2 is applied to a microwave unit in which a recess is provided on the back side of the metal carrier 6 facing the dielectric substrate 7, and a peripheral connection circuit 15 is mounted in the recess.

31B shown in Fig. 2 is a temporary spring material made by bending the central part of an elongated rectangular spring material made of, for example, a thin phosphor bronze plate into an arc shape, and then bending both ends inward in a U-shape to provide a seating part. It's a spring.

Both longitudinal edges of this leaf spring 31B are connected to opposing grooves 3
0, and the leaf spring 31B is seated at a position where the apex surface of the arc is directly below the strip line 10.

Therefore, the arcuate apex surface of the leaf spring 31A is in elastic contact with the upper inner wall of each groove 30 at a position directly below the strip line 10. That is, both metal carriers 6 are electrically connected via the leaf spring 31B at a position directly below the conductor ribbon 11.

The above-described connection structure has the advantage of having a small number of components and being low cost.

〔Effect of the invention〕

As explained above, the present invention provides a semi-cylindrical groove in the opposing side walls of a metal carrier, into which a semi-cylindrical spring is inserted and makes elastic contact, and directly under a conductor ribbon connecting adjacent microwave units. This is a connection structure for microwave units configured to provide a ground conductor at a position, which prevents the occurrence of resonance within a broadband transmission band and improves propagation characteristics, and also reduces the gap between adjacent microwave units. Promoting narrower width and improving transmission impedance,
Furthermore, there are excellent practical effects such as no stress being applied to the dielectric substrate and no risk of damage to the dielectric substrate.

[Brief explanation of the drawing]

Fig. 1 is a diagram of one embodiment of the present invention, (a) is a perspective view of the main part, Φ) is a sectional view, Fig. 2 is a sectional view of another embodiment of the present invention, and Fig. 3 is a circuit module. In the figures, (a) is a plan view, (g)) is a side sectional view, (C) is a sectional view of a circuit module having a peripheral connection circuit, Figure 4 is a sectional view of a conventional example, and Figure 5 is another one. FIG. 2 is a sectional view of a conventional example. In the figure, 1 is a metal case, 3 is a flat base, 5 is a microwave unit, 6 is a metal carrier, 7 is a dielectric substrate, 8 is a microwave circuit, 10 is a strip line, 11 is a conductor ribbon, 13 is a coaxial 20 is a gap, 21 is a side wall, 30 is a groove, and 31A and 31B are leaf springs. Circuit (Jishinyu! Legufushi) Fig. 3 ('F/11) (shi) 2s ≦ set aB month Ifu renichiyayahorigoirinosa] 11th record 5

Claims (1)

[Claims] A microwave unit (5) comprising a dielectric substrate (7) on which a microwave circuit or a microwave transmission line is adhesively mounted on a metal carrier (6) is mounted on a flat base (3). By connecting both opposing strip lines (10) via conductor ribbons (11) that bridge the gap (20) between the microwave units, the adjacent microwave units can be connected to each other. (5) In the circuit modules configured to connect each other, each side wall (21) of the metal carrier (6) constituting the gap (20) is provided with a wire that is perpendicular to the strip line (10) and A groove (30) is provided that opens on the wall surface, is bent upward in a convex arc shape, and the upper surface is connected to the strip line (10).
so as to come into elastic contact with the upper inner wall of the groove (30) at a position directly below the
Both longitudinal edges of the leaf spring (31) are connected to both grooves (30).
), and the plate spring (31) is bridged in the gap (20).