JPS5926649Y2 - Strip line super high frequency oscillator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a negative resistance oscillator using a strip line, and particularly to an oscillator using a dielectric resonator.

Oscillators using negative resistance elements (Gunn diodes, imbat diodes, tunnel diodes, etc.) have conventionally been constructed using waveguides and coax.

In recent years, small, lightweight dielectric resonators with good characteristics have become available, and small and lightweight oscillators have been commercialized by combining them with negative resistance elements in a strip line configuration.

FIG. 1 shows a plan view of an oscillator that combines these conventional strip lines, dielectric resonators, and negative resistance elements.

The negative resistance element 1 is coupled via a connection line 2 to a dielectric resonator 3 placed at an appropriate distance to form an oscillation circuit.

Bias VB of negative resistance element 1 is applied through high frequency blocking circuit 4.

The oscillation output is guided to an output line 6 via a DC blocking circuit 5 to prevent bias voltage from leaking to the load.

The negative resistance oscillator configured in this manner has the following drawbacks.

1. Operation tends to become unstable due to the effects of the high frequency blocking circuit and the DC blocking circuit.

2. Frequency significantly higher than the oscillation frequency (detuned frequency)
There is a lot of noise.

The present invention eliminates the above drawbacks by using a high frequency attenuator instead of a high frequency blocking circuit and a DC blocking circuit and extracting the output from a dielectric resonator, suppressing noise at detuned frequencies and providing stable The purpose of this invention is to provide an oscillator that performs the following operations.

That is, the present invention provides a negative resistance element, a dielectric resonator, a strip line coupled to the dielectric resonator and connected to the negative resistance element, and a strip line that is in contact with the strip line and is not grounded in terms of DC. It is composed of a high frequency attenuator and an output line coupled to the dielectric resonator.

The oscillation section composed of a negative resistance element and a dielectric resonator becomes a single resonant circuit when terminated at the characteristic impedance of the line.

Since this terminating resistor is normally of the ground type, a DC blocking circuit and a high frequency blocking circuit are required to supply a DC bias voltage, and by adding these blocking circuits, it becomes possible to deviate from a single resonant circuit.

Therefore, in the present invention, the terminating resistor is a non-grounded attenuator, and the bias voltage is applied from the other end of the attenuator, thereby eliminating the need for DC blocking and high frequency blocking circuits. By extracting the output from the resonator, noise at the detuned frequency is suppressed by the filtering action of the resonator.

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

FIG. 2 shows a first embodiment of the invention. In the figure, an oscillation section is formed by a negative resistance element 1 connected to a strip line 2 and a dielectric resonator 3, a non-grounded high frequency attenuator 7 is used as a terminating resistor, and a bias voltage VB is applied to the strip line 2. The signal is supplied from the unconnected side of the negative resistance element 1 through the non-grounded high frequency attenuator 7 .

Therefore, the addition of the DC blocking circuit 2 and high frequency blocking circuit 4 shown in FIG. 1 can be omitted, and since these additional circuits are not included, there is no deviation from the single resonant circuit, and stable oscillation is achieved.

Furthermore, since the output is taken out from the output strip line 8 coupled to the dielectric resonator 3, noise in the detuned frequency band is suppressed due to the filtering effect of the dielectric resonator 6.

The non-grounded high frequency attenuator 7 is made of a rubber plate with a width of 1Q mm, a length of 20 mm on the short side and a length of 3Q mm on the long side, and a thickness of 1 mm, which is made of carbonyl iron mixed, so as to cover a 2.2 mm wide strip line. It was fixed onto a substrate 2 made of a Tepron glass laminate using screws 9.

If the substrate can be used with an adhesive, it is fixed with the adhesive.

The reason why the end of the high frequency attenuator 7 on the negative resistance element 1 side is tapered is, of course, for matching with the line.

In addition to the upper part, the high frequency attenuator can also be made of ferrite mixed with carbonyl iron or an insulator coated with carbon.

FIG. 3 shows a modification of the oscillator shown in FIG. 2 so as to take out a monitoring output. In this case, the high frequency blocking circuit 4 and DC element circuit 5 in the conventional example shown in FIG. Since they are attached to the other end of the attenuator 7, the influence of these additional circuits on the oscillation section is suppressed by the amount of attenuation of the high-frequency attenuator 7, thereby eliminating instability caused by these additional circuits.

In FIG. 3, a part of the oscillation output that has passed through the high frequency attenuator and has been sufficiently attenuated is separated from the DC component by a DC blocking circuit and a high frequency blocking circuit, and appears on the monitoring output line 10.

In the case of FIG. 3, the bias for the negative resistance element is supplied through a high frequency blocking circuit.

In the case of Fig. 3, the high-frequency attenuator on the monitoring output side does not have a tapered shape, but this is because it is on the monitoring output side, so line impedance mismatch does not pose much of a problem. In order to match the monitoring output line,
The shape of the high frequency attenuator may be a parallelogram.

The amount of attenuation of the high-frequency attenuator shown in the first and second embodiments is normally preferably 15 db or more, but it can be freely changed in the design depending on the type of negative resistance element, various characteristics of the oscillator, etc. do it.

As explained above, if an oscillator is manufactured according to the present invention, an excellent oscillator can be obtained in which the oscillation operation is always stable, there is no noise at the detuned frequency, and a monitoring output can be taken out as required.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of a conventional strip line oscillator equipped with a negative resistance element and a dielectric resonator, FIG. 2 is a schematic plan view of the first embodiment of the present invention, and FIG. 3 is a schematic plan view of the present invention. FIG. 3 is a schematic plan view of a second embodiment of the invention; DESCRIPTION OF SYMBOLS 1... Negative resistance element, 2... Sl-IJ tube line of oscillation section, 3... Dielectric resonator, 4
...High frequency blocking circuit, 5...Direct current blocking circuit, 7...High frequency attenuator, 8...Output strip line, 10...・Strip line for monitoring output.

Claims (1)

[Scope of utility model registration request] a negative resistance element, a strip line connected to one end of the negative resistance element, a dielectric resonator placed near one end of the strip line, and a length direction of the strip line. a high frequency attenuator provided along and in contact with the strip line; a bias power supply line for the negative resistance element connected to the other end of the strip line; and a bias power line for the negative resistance element connected to the other end of the strip line. 1. A strip line super high frequency oscillator comprising: a monitoring output line for extracting a monitoring output via a capacitor; and an output line coupled to the dielectric resonator.