JP2505008Y2 - Microwave oscillator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a microwave oscillator including a dielectric resonator and an oscillation circuit having a microstrip structure.

[Conventional technology]

Conventionally, this type of dielectric resonator loaded microwave oscillator has a structure shown in FIG. In FIG. 3, reference numeral 1 is a dielectric resonator, and 2 is an oscillation circuit having a microstrip structure. The dielectric resonator 1 has a hollow outer shape having a rectangular outer shape and a round inner shape, and an outer conductor 4 on the outer surface of the hollow dielectric 3.
And the inner conductor 5 is formed on the inner surface. Also, the oscillator circuit 2
Is a microstrip line 7 on the upper surface of the dielectric substrate 6,
The ground conductor 11 is formed on the lower surface and is mounted on the metal plate 12 to connect the ground conductor 11 to the metal plate 12. Further, the microstrip line 7 is equipped with a transistor (not shown).
Then, the microstrip line 7 and the resonator 1
The inner conductor 5 is connected to the inner conductor 5 by the solder 14 or the like using the connection conductor 13.

[Problems to be solved by the device]

In the conventional microwave oscillator described above, the microstrip line 7 is formed on one dielectric substrate 6, and the inner conductor 5 and the microstrip line 7 of the dielectric resonator 1 mounted on the microstrip line 7 are connected to each other. Are connected with. For this reason,
The connection conductor 13 needs to be formed to have a length at least equal to or larger than the thickness of the dielectric substrate 6, and the reduction of the length is restricted. Therefore, when this type of microwave oscillator is applied to a microwave device, the resonance frequency of the dielectric resonator 1 is lowered by the influence of the inductance generated by the length of the connection conductor 13, and a desired oscillation frequency is obtained. There is a problem that it becomes difficult.

The present invention suppresses the influence of the inductance of the connecting conductor,
An object is to provide a microwave oscillator that can easily obtain a desired oscillation frequency.

[Means for solving the problem]

In the microwave oscillator of the present invention, the dielectric resonator and the oscillating circuit are mounted on the same metal plate, the outer conductor and the ground conductor are connected to the metal plate, and they are located on substantially the same plane. The inner conductor of the dielectric resonator and the microstrip line of the oscillating circuit are connected by a connecting conductor that is arranged between them.

[Action]

In this configuration, since the inner conductor of the dielectric resonator and the microstrip line of the oscillation circuit are located on substantially the same plane,
The length of the connecting conductor connecting them can be minimized, and the influence of the inductance due to the length of the connecting conductor is suppressed.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of an embodiment of the microwave oscillator of the present invention, and FIG. 2 is a sectional view thereof. In these figures,
Reference numeral 1 is a dielectric resonator, and 2 is an oscillation circuit. The dielectric resonator 1 has a rectangular and hollow dielectric body 3 having a center portion penetrating in a circular shape, and a metal conductor film is formed on each of the outer surface and the inner surface thereof by vapor deposition or the like to form an outer conductor 4 and an inner conductor 5. Is formed. This dielectric resonator 1 is composed of the length of the inner conductor 5 and the dielectric 3
Resonates at a frequency determined by the relative permittivity of.

Further, in the oscillator circuit 2, the microstrip line 7 is formed in a required pattern on the surface of the dielectric substrate 6, and the oscillation transistor 8, the chip capacitors 9a to 9c, and the resistors 10a to 10c are formed.
10c etc. are surface mounted. Further, a ground conductor 11 is formed on the back surface of the dielectric substrate 6, and the dielectric substrate 6 is mounted on a metal plate 12 with a part thereof cut out, and the ground conductor 11 is mounted on the metal plate 12. Is in direct contact with. Further, the resonator 1 is mounted on the metal plate 12 at the cutout portion of the dielectric substrate 6, and the outer conductor 4 is brought into direct contact with the metal plate 12. Then, the microstrip line 7 and the inner conductor 5 of the resonator 1 which are located on substantially the same plane are electrically connected to each other by the solder 14 via the connection conductor 13.

The microwave oscillator configured as described above has the resonator 1
Since the inner conductor 5 and the microstrip line 7 on the dielectric substrate 6 are located on substantially the same plane, both of them are connection conductors.
13 will be connected in the shortest distance. Therefore, the inductance of the connecting conductor 13 is reduced, the influence on the natural oscillation frequency is suppressed, and a microwave oscillator that can stably obtain a desired frequency can be realized.

[Effect of device]

As described above, according to the present invention, the dielectric resonator and the oscillation circuit are mounted on the same metal plate, and the inner conductor of the dielectric resonator and the microstrip of the oscillation circuit are located on substantially the same plane. Since the line is connected with the connecting conductor, the length of the connecting conductor can be minimized, the influence of the inductance of the connecting conductor on the oscillation frequency can be suppressed, and the desired frequency can be stably obtained.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a sectional view of FIG. 1, and FIG. 3 is a sectional view of a conventional microwave oscillator. 1 ... Dielectric resonator, 2 ... Oscillation circuit, 3 ... Dielectric,
4 ... Outer conductor, 5 ... Inner conductor, 6 ... Dielectric substrate, 7 ...
… Microstrip line, 8… Oscillation transistor, 9a to 9c… Chip capacitors, 10a to 10c… Resistor, 11… Ground conductor, 12… Metal plate, 13… Connection conductor,
14 ... Solder.

Claims (1)

(57) [Scope of utility model registration request] 1. A dielectric resonator in which an outer conductor and an inner conductor are formed on the outer surface and the inner surface of a dielectric having a hollow structure, and a microstrip line and a ground conductor are formed on the front surface and the back surface of the dielectric resonator, respectively. And an oscillation circuit having a transistor mounted thereon, and the dielectric resonator and the oscillation circuit are mounted on the same metal plate to connect the outer conductor and the ground conductor to the metal plate, A microwave oscillator, characterized in that the inner conductor and the microstrip line located on substantially the same plane are connected by a connection conductor arranged so as to extend between the inner conductor and the microstrip line.