JPH01314403A - Micro-wave and millimeter wave module - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Next] 4a Important industrial fields of application Prior art (Figures 5 to 7) Means for solving the problem to be solved by the invention (Figure 1) Working Examples (Figs. 2 to 4) Effects of the Invention [Summary] Regarding microwave/millimeter wave modules, reduction of reflection loss and insertion loss of high frequency input/output terminals that output signals to microwave/millimeter wave circuits. A metal base, a microwave/millimeter wave circuit board mounted on the bottom of this metal base, and a microwave/millimeter wave line of this microwave/millimeter wave circuit board to be guided to the outside. In a microwave/millimeter wave module equipped with a signal output terminal penetrating the side wall of the metal base, this terminal is equipped with a balanced microstrip line, an unbalanced microstrip line, and a combination of both. The connecting portion is provided with a tapered dielectric portion.

[Industrial application field]

The present invention relates to a microwave/millimeter wave module or X-R in which a microwave/millimeter wave circuit board is mounted on the bottom of a metal base, and particularly to a high frequency signal input/output terminal to a microwave/millimeter wave circuit.

Semiconductor components and circuit components are surface-mounted on the dielectric board 5, and microstrip lines, other transmission paths, and circuit elements are patterned and connected, and the other surface of the dielectric board 11q is grounded. Microwave/millimeter wave integrated circuits, which are fixedly housed in metal casings, have now become indispensable in the construction of microwave/millimeter wave wireless devices.

As the frequency becomes higher, the equipment becomes smaller.
Creating a module structure for each circuit function, aiming for generalization and standardization, and combining and assembling these modules to achieve a predetermined comprehensive function is becoming essential for multifunctionality and cost reduction. .

[Conventional technology]

FIG. 5 shows a conventional example of a microwave/millimeter wave module, with FIG. 5(a) being a plan view and FIG. 5(b) being a side view.

In the figure, I is a microwave/millimeter wave circuit board on which microwave circuits, semiconductor elements, etc. are formed on its two sides, and this is fixed to a conductive metal base 10k. As shown in the figure, this metal base 10 has a side wall 10' around its periphery, and an airtight terminal 20 for supplying bias power, etc., and an external lead 21 are provided on this side wall portion, and a signal terminal having a lead 4 is further provided. A coaxial horizontal terminal 15 for ingress and egress is provided. Reference numeral 6 denotes a lid, which in this example has an airtight structure to seal the inside, but it goes without saying that the lid may be omitted if airtightness is not required.

The cage 6 is made of metal, for example.

FIG. 6 is a diagram showing details of the coaxial horizontal terminal 15 for signal input of this conventional microwave/millimeter wave module, FIG. 6(a) is a plan view, and FIG. 6(b) is a Side view, No. 6
FIG. 6(c) is a sectional view taken along line c-c' in FIG. 6(a).

As shown in the figure, the coaxial horizontal terminal 15 is provided so that a portion 8 surrounds the lead 4 serving as a signal line and the lead 4 via dielectrics 2' and 3, and a portion 9.9' surrounds the lead 4. It is constituted by a conductive metal film 7 provided so as to shield the side and bottom surfaces of. The shielding function of the metal film 7 is also clear from FIG. It is enclosed and therefore continuous in this part.

As a result, in portion 8, lead 4, dielectric 2', :3
, a single-domain strip line is formed by the metal film 7, and in the portion 9.9', the lead 4, the dielectric 3
, the metal film 7 constitutes an unbalanced slip line.

[Problem to be solved by the invention]

In this conventional microwave/millimeter wave module, the high frequency terminal that outputs the high frequency signal is composed of a horizontal coaxial terminal that combines an unbalanced microstrip line and a balanced microstrip line (triplate line). Moreover, as shown in FIG. 6, the unbalanced microstrip line and the balanced microstrip line are directly connected. Therefore, this connection part becomes discontinuous for high-frequency signals, and reflection of the signal easily occurs at this discontinuous part, making it difficult to create a structure with low reflection loss over a wide band.

In other words, there is a direct transition from the transmission mode of the balanced strip line shown in Figure 7(a) to the transmission mode of the unbalanced strip line shown in Figure 7(b), and the transmission mode at this connection point is Reflections are inevitable.

Further, this shape of discontinuity has the problem of increasing the radiation loss of the unbalanced microstrip line section.

These increases in reflection loss and radiation loss naturally result in an increase in terminal insertion loss, making it difficult to provide a microwave/millimeter wave module with good characteristics over a wide band.

The present invention has been made in view of these points,
The reflection TTI loss and insertion loss at the high frequency input/output terminal of microwave/millimeter wave modules have been improved over a wide band.
The purpose is to provide microwave/millimeter wave modules with good characteristics.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the present invention.

In FIG. 1, ``■'' is a microwave/millimeter wave circuit board on which a microstrip line 5 and the like are formed, and is adhesively fixed to the surface of a conductive metal base IO. 2.3 is a dielectric, 4 is a lead for high-frequency human output that inputs and outputs signals to the microwave/millimeter wave circuit, 6 is a lid made of, for example, a conductive metal, and the dielectric 2.3 is a lead. Continuous surrounding 4. Further, in the portion 8, the lead 4 is connected to the metal base 101 through the dielectric 2.3.
is surrounded by a conductor, and is also surrounded by a dielectric 2
is tapered at a portion 30 adjacent to portion 8 thereof. With these, the high frequency input/output terminals to the microwave/millimeter wave module are the balanced strip line in the center part 8, the unbalanced strip line in both end parts 9,
It is formed as a coaxial horizontal terminal 15 constituted by a conversion section 30 that connects these two parts.

[Effect]

As described above, in the present invention, a tapered dielectric portion is provided at the connection portion between the unbalanced microstrip line and the balanced microstrip line, and the connection between the unbalanced microstrip line and the balanced microstrip line is Since it constitutes a converter, the transmission mode of the unbalanced microstrip line is gradually converted to the transmission mode of a balanced microstrip line, so the transmission mode at this connection part is lower than when directly connected. Reflection is reduced, and reflection loss at the connection section and radiation loss at the balanced microstrip line section are reduced.

〔Example〕

FIG. 2 is a diagram showing a first embodiment of the present invention, and FIG. 3 is a diagram showing details of the terminal portion of this first embodiment.

In FIG. 2, (a) is a plan view of the microwave/millimeter wave module according to the first embodiment of the present invention, and (b) is a side view of the module in FIG. This is a microwave/millimeter wave circuit board on which semiconductor elements and the like are formed, and this is fixed on a conductive metal base 10. As shown in the figure, this base 10 has a side wall 10' around its periphery, and an airtight terminal 20 for bias and an external lead 21 are provided on this side wall portion.

6 is a lid, and the above structure is similar to the conventional example explained in FIG.

According to the invention, a high frequency signal terminal 15 having a lead 4 is provided.

FIG. 3 is a diagram showing the details of the structure of the terminal 15 according to the present invention, in which FIG. 3(a) is a plan view of the terminal portion, FIG. 3(b) is a side view of the terminal portion, and FIG. FIG. 3(c) is a sectional view taken along line c-c' in FIG. 3(a), and FIG. 3(d) is a perspective view of the terminal 15.

In the figure, 2.3 is a dielectric, and a beam 14 is formed on the surface of the dielectric 3.

The dielectric 2 has a flat central portion 8 and a tapered portion 30,30' provided according to the invention, and as can be seen, the dielectric 2 and the dielectric 3 are connected to the leads 4.
It is continuous with . 7 is the bottom and side surfaces of the dielectric 3;
This is a conductive metal film formed on the flat surface of the dielectric 2. When making the actual module, the metal base 10
The metal film 7 formed on the upper, lower and side surfaces of the terminal portion is not necessarily necessary, since shielding can be achieved by utilizing the conductivity of the metal ink 6.

As described above, the terminal 15 according to the present invention has, on the L side of the lead 4, a portion 8 where the dielectric 2 is flat, a portion 30, 30' where the dielectric 2 is tapered, and a portion where there is no dielectric 2. 9.9'.

a part 8 beam part 4 and a dielectric 2.3 surrounding it;
It is composed of a dielectric 2.3 and a metal film 7 provided around the dielectric 2.3, and this portion becomes a balanced strip line. Further, the portion 9.9' is constituted by the dielectric body 3 and the electrode 4 formed on the surface thereof, and constitutes an unbalanced strip line.

The portion 30.30' with the tapered dielectric 2 provided according to the invention is a conversion part between the aforementioned balanced stripline 8 and the unbalanced stripline 9.9', and is a converter of the unbalanced stripline 8. It functions to gradually convert the transmission mode to the balanced stripline transmission mode, or vice versa.

Therefore, the high frequency signal supplied to the lead 4 gradually changes from the transmission state shown in FIG. 7(b) in the unbalanced stripline section to the
The transmission mode is converted into the transmission mode shown in FIG. 3(a) (or vice versa), and the reflection loss at this connection point can be reduced.

FIG. 4 is a diagram showing a second embodiment of the present invention, in which FIG. 4(a) is a perspective view, FIG. 4(b) is a sectional view, and FIG.
C) is an enlarged sectional view of the terminal portion.

In FIG. 4, the same members as those shown in FIGS. 2 and 3 are given the same numbers.E5. Therefore, a detailed explanation of these members will be omitted.

In this embodiment, an airtight terminal 16 for bias supply is provided vertically on the bottom surface of the base 10, and 1A frequency terminals 15 for outputting signals are provided at four locations.

Further, as shown in the enlarged view of FIG. 4(C), the terminal 15 according to this embodiment has the converting part 30 provided only on the outside of the metal base IO, and the converting part; is not provided with a dielectric material.

The reason why the converter 30 is placed only on the outside of the metal base 10 is to reduce the internal volume of the metal base 10 and make the microwave/millimeter wave module more compact. The reason why the dielectric material on the lower surface is removed is that by locating the dielectric material on the other circuit side in this portion, connection with other circuits can be made using the exposed portion of the lead 4.

It is clear that this embodiment also makes it possible to reduce the reflection loss at the terminal portion.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to modify the reflection [11 loss and insertion loss] of the high frequency input/output terminal of a microwave/millimeter wave module over a wide band, and to provide microwaves with good characteristics over a wide band.・Can provide 1,000 millimeter waves.

[Brief explanation of the drawing]

Fig. 1 shows the principle of the invention Fig. 2 shows a first embodiment of the invention Fig. 3 shows details of the terminal section of the first embodiment of the invention Fig. 4 shows the details of the terminal section of the first embodiment of the invention FIG. 5 shows the second embodiment of the present invention. FIG. 5 shows the conventional example. FIG. 6 shows details of the terminal portion of the conventional example. FIG. 7 shows the electromagnetic field distribution of the transmission line. - Microwave/millimeter wave circuit board 2.3 - Dielectric 4 - High frequency signal human output lead 5 - Strip line - M 7 - Conductive metal film 8 - Balanced strip line 9.9' - Unbalanced Strip line 10 - Metal base 20 - Airtight terminal 21 - External lead; 30.30' - Conversion section (b) Layer (front view) (c) Sectional view Detailed autopsy view 3rd factor ((1) (C) 4 large roux!! 5th stage millet 2nd stage Example Figure 4

Claims (1)

[Claims] (1) A metal base (10), a microwave/millimeter wave circuit board (1) mounted on the bottom of the metal base (10),
The microwave/millimeter wave circuit board (1)
In a microwave/millimeter wave module equipped with a signal input/output terminal (15) penetrating the side wall of the metal base (10) for guiding a millimeter wave line to the outside, this terminal (15) is equipped with a balanced micro A microwave/millimeter wave module characterized by comprising a strip line (8), an unbalanced microstrip line (9), and a tapered dielectric portion (2) at a connection portion between the two.