JPH03167902A - Ridge waveguide-microstrip line converter - Google Patents

Abstract

PURPOSE:To simplify the bonding work and to simplify and miniaturize the circuit constitution by providing a coupling ridge part installed to a microstrip line nearly in parallel with a prescribed interval to a dielectric base and cou pling the coupling ridge part and the microstrip line electromagnetically. CONSTITUTION:A coupling ridge part 13 is formed to other face at one end of a ridge waveguide 10 with respect to the H plane corresponding to a microstrip line 12 of a dielectric base 11 projectingly. The coupling part 13a is in press contact with the dielectric base 11 in parallel with an interval of S with respect to the line 12. Then the coupling ridge part 13 and the line 12 are coupled electromagnetically via the dielectric base 11. Thus, the welding work welding the coupling ridge part 4 and the microstrip line 3 is not required. Moreover, since a DC block function is provided, when an amplifier or the like is formed, any special DC block means is not required. Thus, the circuit constitution is simplified and the miniaturization is promoted as much as pos sible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a ridge waveguide-to-microstreet-to-sopraline converter mounted in microwave equipment.

(Prior Art) Generally, in this type of ridge waveguide-to-microstrip line converter, the ridge waveguide through which microwaves are propagated is in the H plane, as shown in FIGS. 2(a) and 2(b). The ridge waveguide 1 is formed into a substantially rectangular cross section consisting of two tube walls parallel to the (long side) and two tube walls parallel to the E plane (short side), and one side of the H plane at one end of this ridge waveguide 1. A dielectric substrate 2 is extended on the Hl side. A microstrip line 3 is formed on the dielectric substrate 2 to be connected to, for example, an active element of a microwave device (not shown). In addition, the ridge waveguide 1
On the other surface H2 side of the H surface at one end, a step-like coupling ridge portion 4 is formed corresponding to the microstrip line 3 of the dielectric substrate 2, for example. This coupling ridge portion 4 is welded to the microstrip line 3 via a gold foil 5.

Thereby, the microwave propagated through the ridge waveguide 1 is guided to the microstrip line 3 via the coupling ridge portion 4 and the gold foil 5, and is converted into the microstrip line 3.

However, in the above-mentioned ridge waveguide-to-microstrip line converter, the gold foil 5 must be welded to the very small area of the coupling ridge portion 4 and the microstrip line 3, and it is also necessary to minimize mismatches due to discontinuities at the connection points. Due to the high precision welding required, the welding work is troublesome and the assembly work is always complicated.

Furthermore, in the above ridge waveguide-microstrip line converter, when an amplifier is configured by connecting an active element (not shown) such as a field effect transistor to the microstrip line 3, the DC bias of the active element is applied to the microstrip line 3. 3, a microstrip coupled line 6 is provided corresponding to the microstrip line 3, or a microstrip coupling line 6 is provided corresponding to the microstrip line 3, as shown in FIG. It is necessary to provide a DC blocking function by connecting a DC blocking capacitor (not shown) in series to the capacitor. For this reason, when the amplifier is configured as described above, the problem arises that the circuit configuration becomes complicated and the size of the amplifier is increased.

(Problems to be Solved by the Invention) As described above, in the conventional ridge waveguide-microstrip line converter, the assembly work is extremely troublesome, and it does not have a DC blocking function. This has the problem of complicating the circuit configuration and increasing the size.

This invention has been made in view of the above circumstances, and can simplify the configuration and simplify assembly work, and can also add a DC blocking function and contribute to miniaturization of the circuit configuration. It is an object of the present invention to provide a waveguide-to-microstrip line converter.

[Structure of the Invention j (Means for Solving the Problems) This invention provides a conduit which is arranged to extend from one side of the H plane at one end of a conduit having a substantially rectangular cross section, and is approximately parallel to the conduit. a dielectric substrate on which a microstrip line is formed; A ridge waveguide-to-microstrip line converter is constructed by providing a coupling ridge section that is laid substantially parallel to the strip line at a predetermined distance, and including a ridge waveguide.

(Function) According to the above structure, the coupling ridge portion and the microstrip line are electromagnetically coupled via the dielectric substrate, so that the microwave propagated through the ridge waveguide is transmitted to the microstrip line.

Therefore, by eliminating the traditional welding work,
This simplifies the joining work.

Further, since the coupling ridge portion and the microstrip line are electromagnetically coupled, a direct current blocking function is provided.

Therefore, the circuit configuration can be simplified, contributing to miniaturization as much as possible.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a ridge waveguide-microstrip line converter according to an embodiment of the present invention, in which (a) is a front view, (b) is a cross-sectional view, and (c) is a cross-sectional view. FIG. 2 is a cross-sectional view taken along line A-A in FIG. That is, numeral 10 in the figure is a ridge waveguide having a substantially rectangular cross section, and a dielectric substrate 11 is extended on one side of the H plane at one end of the ridge waveguide. On this dielectric substrate 11, a microstrip line 12 is formed substantially parallel to the pipe direction, and the base of this microstrip line 12 is connected to, for example, an active element or the like constituting a microwave device (not shown).

Further, a coupling ridge portion 13 is formed on the other side of the H-plane at one end of the ridge waveguide 10 so as to protrude in correspondence with the microstrip line 12 of the dielectric substrate 11 . The coupling ridge portion 13 is formed, for example, in a substantially step-like shape so that its height is smaller than the H plane at one end of the ridge waveguide 10, and a coupling portion 13a is formed at the tip thereof. The coupling portion 13a is in contact with the dielectric substrate 11 in a manner substantially parallel to the microstrip line 12 at a distance S, and
As shown in Figure (C), it is formed with a width dimension W1 and a connection length dimension L with the dielectric substrate. These width dimensions W1 length dimensions L1
The gap S is a well-known microstrip coupled line 6 (third
It is calculated in almost the same way as the design method (see figure). in this case,
The coupling ridge portion 13 has a length L of the coupling portion 13a that is approximately 1/4 of the line wavelength of the microstrip coupled line 6 (see FIG. 3) corresponding to the microstrip line 12 on the dielectric substrate 11. By doing so, the amount of coupling is maximized, and the distance dimension of the gap S can be maximized.

In the above configuration, the microwave propagated through the ridge waveguide 10 is electromagnetically coupled to the microstrip line 12 in correspondence with the gap S of the coupling part 13a of the coupling ridge part 13, and passes through the coupling part 13a to the microstrip line 12. transmitted to. At this time, the coupling portion 13g connects the microstrip line 12 to the microstrip coupled line 6 (third
(see figure) and has a DC blocking function. As a result, even when an amplifier is configured by connecting an active element (not shown) to the microstrip line 12, short circuits due to the ridge waveguide 10 are reliably prevented, and voltage can be applied to the active element.

In this way, the ridge waveguide-microstrip line converter has a dielectric substrate 11 on which a microstrip line 12 is formed extending from one side of the H plane at one end of the ridge waveguide 10. and a ridge waveguide 1
It protrudes from the other side of the H surface at one end of 0 in correspondence with the microstrip line 12 of the dielectric substrate 11, and is approximately parallel to the microstrip line 12 with a predetermined distance S to the dielectric substrate 11. coupling ridge portion 1 abutted against
3, and by electromagnetically coupling between the coupling ridge portion 13 and the microstrip line 12 via the dielectric substrate 11, the microwave propagated through the ridge waveguide 10 is transmitted to the microstrip line 12. It was arranged. According to this, the welding work for joining the coupling ridge portion 4 and the microstrip line 3 as in the conventional art is eliminated, thereby simplifying the assembly work.

Further, according to this, since the coupling ridge portion 13 and the microstrip line 12 are electromagnetically coupled, a direct current blocking function is provided, so when an amplifier or the like is configured, it is not necessary to take special direct current blocking means. It disappears. Therefore, the circuit configuration can be simplified, contributing to miniaturization as much as possible.

In the above embodiment, the coupling ridge portion 13 is formed in a substantially step-like shape, but the present invention is not limited to this, and it is also possible to form it in an inclined shape, for example. Further, the coupling ridge portion 13 is not limited to a substantially step-like shape or an inclined shape, and various shapes and configurations can be applied.

Therefore, it goes without saying that the present invention is not limited to the above embodiments, and that various modifications can be made without departing from the spirit of the invention.

[Effects of the Invention] As described in detail above, according to the present invention, the structure can be simplified, assembly work can be simplified, and a DC blocking function can be added to reduce the size of the circuit configuration. It is possible to provide a ridge waveguide-to-microstrip line converter that can contribute to acceleration.

[Brief explanation of the drawing]

Fig. 1 is a front view, sectional view, and partial sectional view showing a ridge waveguide-microstrip line converter according to an embodiment of the present invention, and Fig. 2 is a conventional ridge waveguide-microstrip line converter. Front view showing the line converter. The cross-sectional view and FIG. 3 are diagrams showing the relationship between the microstrip line and the microstrip coupled line. 10... Ridge waveguide, 11... Dielectric substrate, 12
. . . Microstrip line, 13 . . . Coupling ridge portion, 13a . . . Coupling portion.

Claims (3)

[Claims] (1) a dielectric substrate on which a microstrip line extending from one side of the H-plane at one end of a conduit having a substantially rectangular cross section and substantially parallel to the conduit is formed; Projects from the other side of the H surface at one end of the path in correspondence with the microstrip line of the dielectric substrate, and contacts the dielectric substrate substantially parallel to the microstrip line at a predetermined distance. 1. A ridge waveguide-to-microstrip line converter, comprising: a ridge waveguide provided with a coupling ridge portion. (2) The coupling ridge portion is formed by forming a coupling portion that comes into contact with the dielectric substrate to have a length that is approximately 1/4 of the wavelength of the microstrip coupling line corresponding to the microstrip line of the dielectric substrate. The ridge waveguide-microstrip line converter according to claim 1. (3) The ridge waveguide-microstrip line converter according to claim 1 or 2, wherein the coupling ridge portion is formed in a stepped or inclined shape from the ridge waveguide.