JPH057111A - Tem mode oscillator - Google Patents

Abstract

PURPOSE:To simplify the design and to attain the oscillation at a desired frequency by providing a circuit pattern of a printed circuit board for the TEM mode oscillator and a center conductor almost on a same plane so as to eliminate an undesired inductive reactance. CONSTITUTION:A hole is made to a board 4, a notch is provided to a mount board 5, a recessed part is formed and a resonator 1 is installed to the bottom face. Then a conductor 2 is directly placed on the pattern 3 so that the center conductor plate 2 is on almost the same plane as the pattern 3 and the conductor 2 and the pattern 3 are electrically connected. Thus, the connection distance between the resonator 1 and the pattern 3 is decreased and then no undesired inductive reactance is caused inbetween. Thus, the design is simplified and a desired oscillating frequency is easily obtained.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a TEM (Transverse Electro Mag
netic Mode) mode oscillator, and more particularly to an oscillator using a TEM mode oscillator.

[0002]

2. Description of the Related Art Heretofore, this type of oscillator has been constructed by including a rectangular parallelepiped (rectangular prism) resonator having a cylindrical cavity and a center conductor inserted in the cavity. The central conductor has, for example, a flat plate shape. FIG. 2 is a schematic sectional view showing an example of the conventional oscillator, and FIG. 3 is an equivalent circuit of FIG.

As shown in FIG. 2, in a conventional oscillator, a circuit board 4 is provided on a case 5 which is a mounting base, a resonator 1 is mounted on the board 4, and a center conductor 6 is provided.
Had one end inserted into the cavity of the resonator 1 and the other end connected to the circuit pattern 3 on the substrate 4. That is, referring to FIG. 3, the central conductor including the unnecessary inductive reactance 7 for coupling with the amplifier 9 is used. 8
Is a coupling capacitor.

According to this structure, the resonance output of the central conductor 6 is transmitted to the circuit pattern 3 on the substrate 4, and the oscillation output is further transmitted to an external amplifier circuit or the like.

However, in the above-described conventional oscillator, since the central conductor 6 having the inductive reactance 7 which is originally unnecessary is used for coupling the resonator 1 and the amplifier circuit 9, the design is complicated or a desired frequency is required. However, there is a drawback in that the oscillation cannot be obtained.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional drawbacks, and an object of the present invention is to provide a TEM mode oscillator which can be designed in a simple manner and can obtain a desired oscillation frequency. Is.

[0007]

The TEM mode oscillator according to the present invention comprises a resonator having a cylindrical cavity and a mounting base on which the resonator is installed such that the central axis of the cavity is parallel to the installation surface. A TEM mode including a pedestal, a circuit board provided with a circuit pattern for connecting the resonator and an external circuit, and a center conductor having one end inserted into the cavity and the other end connected to the circuit pattern The oscillator is characterized in that the circuit pattern of the circuit board and the center conductor are provided on substantially the same plane.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a schematic sectional view showing the structure of an embodiment of a TEM oscillator according to the embodiment of the present invention, and the same portions as those in FIG. 2 are designated by the same reference numerals. In the figure,
In the oscillator of this embodiment, a hole is formed in the substrate 4 or a notch is formed to form a recess, the resonator 1 is installed on the bottom surface thereof, and the plate-shaped center conductor 2 is placed directly on the circuit pattern 3. It differs from the conventional one in that it is implemented in. That is, the plate-shaped central conductor 2 is provided on the substantially same plane as the pattern 3, and the central conductor 2 and the pattern 3 are electrically connected. In this way, the resonator 1 and the pattern 3 are
The connection distance between and becomes short, and unnecessary inductive reactance does not occur between them. Therefore, the design is simplified and the desired oscillation frequency is easily obtained.

In short, in this embodiment, the resonator 1 is provided on the case 5 as a mounting base so that the central axis of the cylindrical cavity is parallel to the setting surface, and the central conductor is on a plane parallel to the mounting surface. 2 is provided. Further, the circuit pattern 3 is provided on a plane parallel to the installation surface of the resonator 1 and is electrically connected to the plate surface of the central conductor 2. The center conductor is not limited to the flat plate shape, and may be any shape that does not cause unnecessary induction inductance when connected to the circuit pattern.

[0011]

As described above, according to the present invention, the center conductor is provided on the same plane as the circuit pattern on the substrate, and the center conductor is mounted so as to be directly placed on the pattern. Since the unnecessary inductive reactance generated between the conductor and the pattern can be removed, the design is simplified,
There is an effect that a desired oscillation frequency can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing a schematic configuration of a TEM mode oscillator according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a schematic configuration of a conventional TEM mode oscillator.

FIG. 3 is an equivalent circuit of the oscillator of FIG.

[Explanation of symbols]

 1 Resonator 2 Plate-shaped central conductor 3 Circuit pattern 4 Substrate 5 Case

Claims (1)

Claim: What is claimed is: 1. A resonator having a cylindrical cavity, and a mounting base having an installation surface on which the resonator is installed such that a central axis of the cavity is parallel to the installation surface. A TEM mode oscillator including a circuit board provided with a circuit pattern for connecting the resonator and an external circuit, and a center conductor having one end inserted into the cavity and the other end connected to the circuit pattern A TEM mode oscillator, wherein the circuit pattern of the circuit board and the center conductor are provided on substantially the same plane.