JPH05110338A - Millimeter wave oscillator - Google Patents

Abstract

PURPOSE:To facilitate the design, to prevent damage to a semiconductor element and to reduce number of structural components by providing a branch of a waveguide used to fix the millimeter wave oscillation circuit to the structure and installed freely in the waveguide while using the structure as a guide to the waveguide. CONSTITUTION:A millimeter wave oscillating circuit 11 generating a signal whose frequency is equivalent to that of a millimeter wave frequency is integrated in one block and the millimeter wave oscillating circuit 11 has a frequency modulation terminal. Then the millimeter wave oscillating circuit 11 is fixed onto a plane at the tip of a cylindrical structure 14 by soldering or the like. A hole used to insert core wires 12, 13 is penetrated in the axial direction to the structure 14 and a bias voltage is applied to the millimeter wave oscillating circuit 11 through the core wires 12, 13, and in this case, a millimeter wave oscillating circuit mount 1 is inserted freely in a branch 21 provided to a waveguide 2 by using the structure 14 as a guide. That is, the millimeter wave oscillating circuit mount 1, the waveguide 2 including a branch 21, a moving short-circuit plate 22 provided to one end of the waveguide 2 form the waveguide type millimeter wave oscillator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a millimeter wave (millimeter wave frequency) oscillator, and more particularly to a millimeter wave oscillator which can be modulated by an electric method.

[0002]

2. Description of the Related Art A conventional millimeter wave oscillator having a frequency modulation function will be described with reference to the sectional view of FIG.

An oscillating mount 31 having a millimeter waveband oscillating semiconductor element 32 for oscillating a millimeter waveband signal is inserted in a branch tube 36 of the waveguide 35. A branch pipe 39 is also provided at a position opposite to the branch pipe 36, and a tip of a bias rod 41 placed at the center of the branch pipe 39 has a millimeter wave band semiconductor device 3.
It is connected to one of the two electrodes by mechanical means. The bias rod 41 is fixed by a spring 45, fixtures 47, 49 and an absorber 43 which also has an action of preventing unnecessary resonance of the millimeter wave oscillation circuit.

On the other hand, in the branch pipe 37, which is displaced from the branch pipe 36 by an appropriate position in the pipe axis direction of the waveguide 35,
A varactor mount 33 on which a varactor diode 34, which is a frequency modulation element, is mounted is inserted. Branch pipe 3
A branch pipe 40 is also provided at an opposite position of 7, and the tip of a bias rod 42 placed at the center thereof is connected to one electrode of the varactor diode 34 by mechanical means. The bias rod 42 includes the spring 46, the fixtures 48 and 50, and the absorber 4.
Fixed by 4.

When a voltage is applied to the bias rod 41, the millimeter-wave band oscillation semiconductor element 32 becomes a resonance circuit composed of a waveguide 35, a movable short-circuit plate 38 provided at one end of the waveguide 35, and a varactor diode 34. It oscillates at the corresponding frequency, and the oscillation signal is output to the RF OUT terminal. Also,
When a voltage is applied to the bias rod 42, the varactor diode 34 changes to a capacitance according to the applied voltage, so the resonance frequency of the resonance circuit changes, and this oscillation circuit changes the oscillation frequency and frequency-modulates the oscillation signal. can do.

[0006]

The conventional millimeter wave oscillator described above requires a mount and a bias voltage input line to be inserted into the waveguide in each of the millimeter wave band oscillating semiconductor element and the varactor diode, and also has a semiconductor. The element and the bias line were mechanically connected. For this reason, it becomes difficult to make the distance between the millimeter-wave band oscillation semiconductor element and the varactor diode smaller than the wavelength of the oscillation signal, and the oscillator design requires a complicated design calculation by a distributed constant circuit,
Moreover, there is a drawback that the design error is large. Further, since the constant of the resonance circuit changes due to the change of the contact of the mechanical connection part, the manufacturing reproducibility is poor, and the millimeter wave band oscillation semiconductor element and the varactor diode are often damaged during the manufacturing adjustment. .. Further, since the number of mechanical components is large and complicated, it is difficult and expensive to manufacture.

[0007]

A millimeter wave oscillator according to the present invention is an oscillator having a high frequency oscillation circuit integrated in one block and a hole for fixing the high frequency oscillation circuit and introducing a bias line of the high frequency oscillation circuit. A structure and a waveguide having a branch pipe that allows the high-frequency oscillator to be freely inserted into the waveguide by using the oscillator structure as a guide and lead the bias line to the outside of the waveguide.

[0008]

The present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway perspective view of an embodiment of the present invention. A millimeter wave oscillator circuit 11 that generates a signal of a millimeter wave frequency is integrated in one block. The millimeter wave oscillation circuit 11 has a frequency modulation terminal. The millimeter wave oscillation circuit 11 is fixed on the plane of the tip of the cylindrical structure 14 by soldering or the like. In the structure 14, the core wire 1
Holes 2 and 13 pass through in the axial direction, and a bias is supplied to the millimeter wave oscillation circuit 11 through core wires 12 and 13. These millimeter wave oscillation circuit 11, structure 14, core wire 1
Reference numerals 2 and 13 form the millimeter wave oscillator circuit mount 1. The millimeter wave oscillator circuit mount 1 includes a branch pipe 2 provided on a waveguide 2.
The structure 14 is inserted into the position 1 as a guide. The millimeter wave oscillation circuit 11 can be inserted into the waveguide 2 through the branch pipe 21. Millimeter-wave oscillator circuit mount 1, waveguide 2 including branch pipe 21, and waveguide 2
The movable short-circuit plate 22 provided at one end of the above constitutes a waveguide type millimeter-wave oscillator. Then, by applying a bias from each of the core wires 12 and 13 led out of the branch pipe 21, oscillation of a millimeter wave frequency occurs, and a millimeter wave frequency signal whose frequency is modulated is output from RFOUT as necessary.

FIG. 2 is a plan view showing an example of the millimeter wave oscillating circuit 11 of FIG. 1, which has frequency modulating means for inputting an electric signal. The millimeter wave oscillation circuit 11 includes a millimeter wave oscillation semiconductor element 111 such as a Gunn diode or an impatt diode, a varactor diode 112, and a capacitor 1.
Reference numerals 14 and 115 are circuits mounted in one block on a circuit board 116 made of copper, for example, as a lumped constant circuit. One end of the capacitor 113 is mounted on and connected to one electrode of the varactor diode 112. The circuit elements are connected by signal lines. That is, the signal line 117 is provided between the other end of the capacitor 113 and the millimeter-wave band oscillation semiconductor element 111, and between the capacitor 114 and the other end of the capacitor 113 and the varactor diode 112.
And the capacitor 115 are connected by ¼ wavelength type choke coils 118 and 119, respectively.

In the millimeter wave oscillation circuit 11, assuming that the core wires 12 and 13 of FIG. 1 which are bias circuits are connected to the electrodes of the capacitors 115 and 114 on the non-grounded side, for example, a DC voltage applied to the core wire 13 is applied. Is added to the millimeter wave band semiconductor element 111, and as a result, the millimeter wave band semiconductor oscillator element 111 oscillates. on the other hand,
The voltage applied to the core wire 12 is applied to the varactor diode 112, and as a result, the capacitance value of the varactor diode 112 becomes a value according to the applied voltage value. Choke coil 118
And 119 sufficiently act on the oscillating frequency, the oscillating frequency of the millimeter wave oscillating circuit 11 is the millimeter wave oscillating element 111, the varactor diode 112, and the signal line 11.
7. It is determined by the oscillation circuit composed of the transmission line impedance and the load impedance of the waveguide 2 which can be adjusted by the movable short-circuit plate 22 shown in FIG. Therefore,
The design calculation of the millimeter wave oscillator including the waveguide 2 can be performed in a lumped constant, which is very simple. On the other hand, choke coil 1
Regarding the oscillating signal that leaks out from the oscillating signals 18 and 119, since the inductance components of the core wires 12 and 13 that are bias circuits have a very large impedance with respect to these oscillating signals, the oscillating signal is directed toward the choke coils 118 and 119. Reflected or capacitors 114,11
5 to ground to the circuit board 116. Moreover, since the capacitance of the varactor 112 changes according to the voltage applied to the core wire 12, the constant of the oscillation circuit changes according to the voltage value, and as a result, the oscillation signal is electrically frequency-modulated.

[0012]

As described above, according to the present invention, a high-frequency oscillator circuit integrated in one block is fixed to a structure, and the high-frequency oscillator circuit is installed as a guide so that the high-frequency oscillator circuit can be freely positioned inside the waveguide. By providing the branch tube of the wave tube, it is possible to design the millimeter wave oscillation circuit as a lumped circuit and to reduce the design error. At the same time, the number of mechanical components can be reduced and made simple, which has the effect of facilitating manufacturing and reducing cost. Further, since the semiconductor element for oscillation and the varactor diode are not mechanically connected, there is an effect that manufacturing reproducibility is good and there is no mechanical damage.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of an embodiment of the present invention.

FIG. 2 is a plan view showing an example of a millimeter wave oscillator circuit used in the embodiment of FIG.

FIG. 3 is a cross-sectional view of a conventional millimeter wave oscillator.

[Explanation of symbols]

 1 Millimeter wave oscillation circuit mount 2,35 Waveguide 11 Millimeter wave oscillation circuit 12,13 Core wire 14 Structure 21, 36, 37, 39, 40 Branch tube 22,38 Movable short circuit plate 31 Oscillation mount 32,111 Millimeter wave band Oscillation semiconductor element 33 Varactor mount 34,112 Varactor diode 41,42 Bias rod 43,44 Absorber 45,46 Spring 47-50 Fixing tool 113-115 Capacitor 116 Circuit board 117 Signal line 118,119 Choke coil

Claims (1)

[Claims] 1. A high-frequency oscillator circuit integrated in one block, an oscillator structure having a hole for fixing the high-frequency oscillator circuit and introducing a bias line of the high-frequency oscillator circuit, and the high-frequency oscillator including the oscillator structure. And a waveguide having a branch pipe capable of guiding the bias line to the outside of the waveguide while being freely inserted into the waveguide as a guide.