JPS60160704A - Microwave oscillator - Google Patents

Abstract

PURPOSE:To attain ease of adjustment by forming a supporting base of a resonator into a polygonal shape so as to fix the resonator and the supporting base in an eccentric state thereby making the oscillating frequency and the oscillated power stable against vibration. CONSTITUTION:The upper face of the supporting base 2 is formed as an octagon, inserted to a recessed part of a case 5 and the periphery of a resonator Z is made in contact with one side of the octagon and the base 2 and the resonator Z are fitted while the centers of the resonator Z and the supporting base 2 are made eccentric. A distance (t) between a coupling strip line SL and the resonator Z takes sequentially five-stages of discrete values by turning the octal supporting base 2 at each 45 deg.. Thus, the distance (t) is decided with high accuracy, the frequency and power of oscillation are adjusted easily, the supporting base 2 is fitted to the recessed part of the case 5 and then is not moved to the right and left and the operation is made stable against vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical field to which the invention pertains) The present invention relates to a microwave oscillator equipped with a dielectric resonator.

(Prior Art) There are various circuit systems for microwave oscillators (hereinafter simply referred to as oscillators), and among them, a modified Colpitts circuit with a grounded collector will be described. FIG. 1 is a circuit diagram of a typical oscillator. However, microstrip line SL and dielectric resonator (hereinafter simply referred to as resonator) Z
is a drawing of a schematic planar figure. This oscillator consists of an output terminal 1, a circulator ISO, a circulator termination resistor R1, a DC blocking capacitor C1, an oscillation coupling microstrip line SL, and an oscillation transistor Tr1.
Choke coil L for microwave blocking.

It consists of L and L resonators 2. The transistor Tr has a base bias voltage Vll and an emitter power supply voltage vl.
e is supplied. In such an oscillator, the distance between the resonator 2 and the oscillation coupling microstrip line SL and the distance t between the resonator 2 and the oscillation transistor Tr are important factors that determine the frequency and power stability of the oscillator output. It is. The distance t is approximately 1/2 of the wavelength λ at the normal oscillation frequency.
(or an odd multiple of λ/2). For example 3.35
~3.46 GH2 band microwave oscillator, the spacing is 0.7 to 1.4 mm, the distance t is 15 to 18 mm, and the diameter of the resonator 2 is 16.2 to 16 mm depending on the oscillation frequency. .7
It is necessary to change it within a range of 111m.

2 is a plan view of essential parts of the oscillator shown in FIG. 1, and FIG. 3 is a sectional view taken along the line A--A. The resonator 2 and its support base 2 are fixed concentrically with adhesive.

The support stand 2 is inserted into a recess of a case 5 and is attached to the case 5 with screws 4. Interval (1) and distance (4) between coupling strip line SL and resonator Z
To change this, the support base 2 was moved back and forth and left and right. In this oscillator, the support base 2 is designed to be able to move over a wide range in the vertical and horizontal directions with respect to the case 5, so it is extremely difficult to make fine adjustments, and the support base 2 has a structure that allows it to be moved over a wide range in any direction. The position of the resonator is easily moved due to vibration. Therefore, the conventional oscillator has the drawback that the oscillation frequency and power easily fluctuate due to vibration, and it is difficult to adjust the frequency and power. To provide a microwave oscillator that is stable against vibration and easy to adjust.

(Structure of the Invention) The structure of the present invention includes a microwave oscillation circuit, a cylindrical dielectric, a microstrip line that couples the oscillated electromagnetic waves of the microwave oscillation circuit to the dielectric, and an axially symmetric body. , a microwave oscillator comprising: a support base having a bottom surface of the dielectric fixed to a plane perpendicular to the axis; and means for fixing the relative position of the support base with respect to the microstrip line, wherein the plane is polygonal. The axis of the dielectric and the axis of the support are parallel to each other and spaced apart from each other, and the fixing means is arranged in a discrete manner about the axis of the support with respect to the microstrip line. Embodiments of the Invention Next, the present invention will be described in detail with reference to Examples.

FIG. 4 is a plan view of an embodiment of the present invention, and FIG. 5 is a sectional view taken along the line B-B of the embodiment.0 The upper surface of the support base 7 of this embodiment is octagonal. 2 opposing octagons
The sides are in contact with the recess of the case 5, and the case 5 is fitted into the recess.

The support base 7 and the peripheral wall of the recessed portion of the case 5 are precisely machined so that the gap is 0.1 degrees or less. Further, the circumference of the resonator 20 is in contact with one side of the 8-sided support base 70, and the resonator 20 is mounted with the center of the resonator 2 and the center of the support base 7 eccentric. Therefore, the distance t between the coupling strip line SL and the resonator section takes discrete values in five steps every 45 rotations of the octagonal support 7. With this structure, one interval meter The oscillation frequency and power can be easily adjusted with high accuracy.In addition, since the support base 7 is fitted into a recess in the case 5 and cannot move in the left-right direction in the figure, it does not operate against vibrations. It is stable. The auxiliary plate 3 in this embodiment is installed to prevent electromagnetic waves from leaking from the groove at the bottom of the case 5. Further, in this embodiment, the support stand 7 is octagonal, but the support stand of the present invention may be any polygon and is not limited to an octagon.

(Effects of the Invention) As described above, in the present invention, the support base of the resonator is made polygonal, and the resonator and the support base are fixed in an eccentric state, so that the support base can be rotated. The distance between the coupling stripline and the resonator can be changed stepwise with high precision, and the distance does not easily change even when there is vibration. Therefore, according to the present invention, it is possible to provide a microwave oscillator whose oscillation frequency and oscillation power are stable against vibrations and whose oscillation frequency and oscillation power can be easily adjusted.

[Brief explanation of drawings]

Figure 1 is a circuit diagram of a typical microwave oscillator (however,
Microstrip line SL and resonator 2 are schematic plan views), Fig. 2 is a plan view of a conventional microwave oscillator, Fig. 3 is a cross-sectional view taken along the line A-A in Fig. 2, and Fig. 4 is a schematic plan view of a conventional microwave oscillator. FIG. 5 is a plan view of one embodiment of the present invention, and FIG. 5 is a sectional view taken along the line BB in FIG. 4. 1... Oscillator output terminal, ISO...
Circulator, R...Circulator termination resistor, C...DCjp stop capacitor, SL
...Microstrip line for oscillation coupling, V
B...Base bias voltage, vE...
...Emitter power supply voltage, Tr...Oscillation transistor s Lr + LH...Choke coil for microwave blocking, Z...Dielectric resonator, t
...The distance between the oscillation coupling strip line SL and the dielectric resonator Z, or the distance between the base of the transistor and the dielectric resonator Z, 2,7... Dielectric resonator support stand, 3... Auxiliary plate, 4...
・Screw, 5... Case.

Claims (1)

[Claims] A microwave oscillation circuit, a cylindrical dielectric, a microstrip line that couples the oscillated electromagnetic waves of the microwave oscillation circuit to the dielectric, and an axially symmetric body, the dielectric in a plane perpendicular to this axis. a support base whose bottom surface is fixed;
In the microwave oscillator comprising means for fixing the relative position of the support with respect to the microstrip line, the plane is polygonal, and the axis of the dielectric and the axis of the support are parallel to each other. And far away,
The microwave oscillator is characterized in that the fixing means fixes the support body at positions rotated by discrete angles about the axis of the support body with respect to the microstrip line.