JPH1013150A - High-frequency oscillator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress rapid fluctuations of an oscillation frequency or a phase, owing to temp. change and a vibration or a shock from an outside and to highten the stability by connecting the central conductor of a TEM mode dielectric resonator to a pattern in a print substrate, through the use of a central conductor connecting pattern which is formed on the end surface of the TEM mode dielectric resonator. SOLUTION: The TEM mode dielectric resonator 15 is mounted on the print substrate and the central conductor connecting pattern 16 formed on the end surface of the TEM mode dielectric resonator 15 is connected to the circuit pattern of the print substrate by soldering, etc. Thus, the central conductor of the TEM mode dielectric resonator 15 is connected to the circuit pattern 13 in the print substrate, through the use of the central conductor connecting pattern 16, so that formation is integrally executed with the metallization of the central conductor so as to obtain perfect connection. Then, stray capacity in a very small gap and an inductance are excluded. Therefore, an oscillator with a stable resonance frequency is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency oscillator using a TEM mode dielectric resonator as a resonator and mounting the TEM mode dielectric resonator on a printed circuit board.

[0002]

2. Description of the Related Art FIG. 4 is a circuit diagram of a conventional example of this type of high-frequency oscillator, and FIG. 5 is a perspective view of a TEM mode dielectric resonator 20 and an electrode fitting 21.

A TEM mode dielectric resonator 20 is mounted on a printed circuit board, and a center conductor of the TEM mode dielectric resonator 20 is electrically connected to an electrode fitting 21 mounted on the TEM mode dielectric resonator 20 to form a circuit pattern on the printed circuit board. 1
3 is connected by soldering or the like. The circuit pattern 13 includes capacitors 4 and 5, resistors 2 and 3, and a transistor 1.
And a transistor circuit composed of circuit patterns 11 and 12 are connected by a coupling capacitor 7, and a varactor circuit composed of a coupling capacitor 6, a choke coil 8, a varactor diode 9 and a circuit pattern 14 is connected. Thus, an oscillation circuit is formed.

FIG. 6 is a view showing the structure of a TEM mode dielectric resonator 20, and FIG. 7 is an enlarged view of a portion A in FIG.

[0005] The TEM mode dielectric resonator 20 has a kind of coaxial line structure in which a hole is formed in the center of a dielectric of a prism and the inner surface of the hole and the outer surface of the dielectric are metallized. Then, a metallized portion on the inner surface of the hole, that is, a plate-shaped electrode fitting 21 for connecting the center conductor to the circuit pattern 13 on the printed board is press-fitted or soldered to the TEM mode dielectric resonator 20. When the electrode fitting 21 is press-fitted, a minute gap is formed between the electrode fitting 21 and the center conductor 22 as shown in FIG. In addition, even when soldering, it is difficult to rotate the solder over the entire hole of the center conductor of the small dielectric resonator, and a similar minute gap is generated.

The resonance frequency of the resonator viewed from the oscillation element of the oscillator includes the resonance frequency of the TEM mode dielectric resonator 20 itself and the reactance of the electrode fitting 21. In this case, the reactance of the electrode fitting 21 includes stray capacitance and inductance due to a minute gap generated between the center conductor and the electrode fitting 21. Therefore, the resonance frequency of the conventional TEM mode dielectric resonator 20 using the electrode fitting 21 is a resonance frequency determined by including a stray capacitance and an inductance due to a minute gap generated between the center conductor and the electrode fitting 21. .

Since the oscillation frequency of the oscillator is dominantly determined by the resonance frequency of the resonator used, the oscillation frequency is also determined by the minute gap generated between the center conductor of the TEM mode dielectric resonator 20 and the electrode fitting 21. The frequency is determined including stray capacitance and inductance.

[0008]

The above-mentioned conventional high-frequency oscillator has the following problems.

The first problem is that the oscillation frequency of the oscillator or the phase of the oscillation signal fluctuates rapidly due to a temperature change. The reason is that the TEM mode dielectric resonator 2
0 and the expansion coefficient of the electrode fitting 21,
This is because when the temperature changes, the minute gap generated between the center conductor and the electrode fitting 21 changes, and the contact point changes. Every time the contact point fluctuates, the stray capacitance and inductance due to the minute gap included in the reactance of the electrode fitting 21 instantaneously change, and as a result, the resonance frequency of the TEM mode dielectric resonator 20 and, hence, the oscillation of the oscillator The frequency or the phase of the oscillation signal fluctuates instantaneously.

The second problem is that the oscillation frequency of the oscillator or the phase of the oscillation signal fluctuates rapidly due to external vibration or impact. The reason is that the minute gap generated between the center conductor of the TEM mode dielectric resonator 20 and the electrode fitting 21 changes due to external vibration or impact, and the contact point fluctuates. As a result, similarly to the first problem, the oscillation frequency of the oscillator or the phase of the oscillation signal fluctuates instantaneously.

An object of the present invention is to provide a high-stability high-frequency oscillator that suppresses a rapid change in oscillation frequency or phase due to temperature change, external vibration or shock.

[0012]

According to the high frequency oscillator of the present invention, a connection between a center conductor of a TEM mode dielectric resonator and a pattern on a printed circuit board is formed on an end face of the TEM mode dielectric resonator. It is done using patterns.

Since the connection between the center conductor of the TEM mode dielectric resonator and the pattern on the printed circuit board is performed using the pattern formed on the end face of the TEM mode dielectric resonator, the connection is formed integrally with the metallization of the center conductor. Since the connection can be completed and the connection can be made completely, the floating capacitance and inductance in a minute gap as in the conventional electrode fitting can be eliminated. Therefore, an oscillator having a stable resonance frequency, that is, an oscillator having a stable oscillation frequency can be obtained.

[0014]

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

FIG. 1 is a circuit diagram of a high-frequency oscillator according to an embodiment of the present invention, and FIG. 2 is a TEM mode dielectric resonator 1 shown in FIG.
5A and FIG. 3A, FIG. 3B, and FIG.
FIG. 3 is a plan view, a front view, and a side view of the EM mode dielectric resonator 15. 4 denote the same components.

A TEM mode dielectric resonator 15 is mounted on a printed circuit board, and a center conductor connecting pattern 16 formed on an end face of the TEM mode dielectric resonator 15 is connected to a circuit pattern 13 of the printed circuit board by soldering or the like. Have been.

As shown in FIG. 3, the inner surface of the hole, that is, the portion serving as the center conductor, and the pattern 16 formed on the end surface of the TEM mode dielectric resonator 15 are metallized, and both are electrically connected. I have.

The resonance frequency of the resonator viewed from the oscillation element of the oscillator is the resonance frequency of the TEM mode dielectric resonator 15 itself including the reactance of the connection pattern. There is no stray capacitance or stray inductance as in the case of the conventional electrode fittings, and it is stable.

Therefore, the TEM mode dielectric resonator 1
Since the resonance frequency of the oscillator 5 becomes stable, the oscillation frequency or phase of the oscillator also becomes stable.

[0020]

As described above, the present invention has the following effects. (1) A rapid change in oscillation frequency or phase due to temperature change does not occur. The reason is that the connection between the center conductor of the TEM mode dielectric resonator and the pattern on the printed circuit board is performed using the pattern formed on the end face of the TEM mode dielectric resonator, and is thus affected by the temperature change. This is because there is no easy mechanical contact surface, so that the resonator frequency of the TEM mode dielectric resonator becomes stable, and thus the oscillation frequency of the oscillator does not fluctuate. (2) A sudden change in the oscillation frequency or phase due to vibration or shock from the outside does not occur. The reason is (1)
As in the case of the effect described above, there is no mechanical contact surface that is easily affected by vibration or impact from the outside, so that the resonator frequency of the TEM mode dielectric resonator becomes stable, and therefore the oscillation frequency of the oscillator does not fluctuate. is there.

[Brief description of the drawings]

FIG. 1 is a pattern of a printed circuit board and a component mounting diagram showing a high-frequency oscillator according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a portion where a TEM mode dielectric resonator 15 of the high frequency oscillator of FIG. 1 is mounted.

FIG. 3 is a plan view of a TEM mode dielectric resonator 15 (FIG. 3);
(A)), front view (FIG. 3 (b)) and side view (FIG.
(C)).

FIG. 4 is a pattern of a printed circuit board and a component mounting diagram showing a conventional example of a high-frequency oscillator.

5 is a perspective view showing a mounting portion of a TEM mode dielectric resonator 20 of the high frequency oscillator of FIG. 4;

FIG. 6 is a plan view of the TEM mode dielectric resonator 20 (FIG. 6);
(A)), front view (FIG. 6 (b)) and side view (FIG. 6).
(C)).

FIG. 7 is an enlarged view of a portion A in FIG. 6 (a).

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 oscillation transistor 2 resistor 3 resistor 4 to 7 capacitor 8 coil 9 varactor diode 10 frequency control terminal 11 to 14 circuit pattern 15 TEM mode dielectric resonator 16 center conductor connection pattern 17 outer conductor pattern 18 output terminal 19 power supply terminal 20 TEM Mode dielectric resonator 21 Electrode fitting 22 Central conductor

Claims (2)

[Claims] 1. A high-frequency oscillator using a TEM mode dielectric resonator as a resonator, wherein the TEM mode dielectric resonator is mounted on a printed circuit board, wherein: a center conductor of the TEM mode dielectric resonator; A high-frequency oscillator characterized in that connection with a pattern on a printed board is made using a center conductor connection pattern formed on an end face of a TEM mode dielectric resonator. 2. The high-frequency oscillator according to claim 1, wherein said center conductor connecting pattern is connected to a pattern of said printed circuit board by soldering.