JPS61116407A - Oscillating multiplying device - Google Patents

Abstract

PURPOSE:To improve the stability of an action of the oscillating multiplying device and to improve a characteristic of electricity by installing an absorbing part to absorb an output wave component of the frequency higher than the frequency of the output wave of the output waveguide. CONSTITUTION:To take out an output wave efficiently, cut-off waveguides 11 and 12 to shut off the output frequency, for example, 2fo are installed on the H surface of an output waveguide 6, electric absorbing bodies 13 and 14 are installed at the short-circuiting part of the cut-off waveguide and the absorbing part is constituted. By the absorbing body composed of the cut-off waveguide including an electric wave absorbing body comparatively easily constituted which is installed at the output guidewave, the output wave is not influenced, and therefore, the characteristic of the output wave will not be deteriorated. On the other hand, the load can be made heavy for the output wave component having a higher frequency than that of the output wave. Thus, the output wave component can be attenuated and its occurrence can be prevented, and therefore, the action of the oscillating multiplying device can be stable and the electric characteristic can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in an oscillation multiplier used in a wireless transmitting/receiving device whose transmitting/receiving frequency is a microwave band or higher.

Generally, when a Gunn diode, which has negative resistance over a wide frequency range, is used as the oscillation semiconductor element for an oscillation multiplier that combines a waveguide and a microstrip line, variations in the diode and case Stray capacitance or the like may cause oscillation at a frequency other than the predetermined frequency, and in such a case, the wireless transmitter/receiver cannot operate normally.

Therefore, there is a need for an oscillation multiplier that is less likely to oscillate at frequencies other than the predetermined frequency.

A perspective view is shown.

In FIG. 4, a negative resistance element (for example, a Gunn diode) 4 is connected to a microstrip line 2 having a resistive film 5.
It oscillates at the resonant frequency of the dielectric resonator at a position L 1 #(2n+1)·Z·λg that satisfies the oscillation condition.

Here, λg indicates the oscillation wavelength.

However, since the negative resistance of the Gunn diode has broadband characteristics and nonlinearity, a wave with a frequency equal to the resonant frequency fo of the dielectric resonator 1 (referred to as the fundamental wave)
In addition, harmonics having frequencies of 2fo, 3fo, . . . are also generated, and these harmonics are output from the output waveguide 6 having high-pass filtering characteristics.

Furthermore, since the portion where the dielectric resonator 1 is housed is a large space, it is likely to combine with the generated harmonics and cause unnecessary resonance.

Therefore, in order to prevent this, λ/
A band-elimination filter 10 with lines of χ and a first cutoff waveguide 7 are provided.

FIGS. 5 and 6 show configuration diagrams of a conventional example with another configuration.

Both Figures 5 and 6 show that when a Gunn diode with negative resistance is inserted into a waveguide, the waveguide with high impedance and the Gunn diode are matched, and the harmonic power generated from the Gunn diode is generated, for example, as desired. This is a configuration diagram when a matching box is inserted in order to efficiently extract the doubled output wave.
This shows the case where an 8.9 inch 11-inch tuner is installed.

In either case, the maximum output wave can be obtained by moving the stub or shorting plate.

[Problem that the invention seeks to solve]

Among these matching devices, a stub type tuner (not shown in FIG. 5) tends to have a small Q and a complicated structure in the millimeter wave band. Further, although the E-H type tuner shown in FIG. 6 has a high Q, the structure is large and complicated.

Additionally, there is a high possibility that the Gunn diode will cause parasitic oscillation at high frequencies due to a resonant circuit formed by parasitic inductance or capacitance caused by the Gunn diode package or the connection ribbon connecting the Gunn diode and the micro strip line. There were two problems.

Means for Solving Problem c] The above problem is solved by the oscillation multiplier of the present invention, which has an absorption section in the output waveguide that absorbs an output wave component with a frequency higher than the frequency of the output wave. .

[Effect]

The present invention utilizes the high-pass filtering characteristics of the waveguide to increase the load on undesired output wave components having frequencies higher than the desired output wave frequency (for example, 2fo). An absorption section is provided that prevents parasitic oscillations at frequencies other than 2fo and attenuates harmonic components (referred to as output components) of 3fo, 4fo, etc.

That is, as an example of the configuration of the absorption section, a cutoff waveguide that blocks the desired output wave is provided on the side wall of the output waveguide, and a radio wave absorber, for example, in the form of a square pyramid is fixed to the short circuit part of the cutoff waveguide. Alternatively, a cut-off waveguide having a movable short-circuit portion to which a four-sided pyramidal radio wave absorber is fixed is provided on the side wall of the output waveguide.

With this configuration, output wave components other than the desired output wave are absorbed by the radio wave absorber, so harmonics can be attenuated and parasitic oscillations can be suppressed.

〔Example〕

The gist of the present invention will be specifically explained below with reference to illustrated examples. Note that the same reference numerals refer to the same objects throughout the plan.

1 to 3 show configuration diagrams of three types of embodiments of the present invention.

In Fig. 1, cutoff waveguides 11 and 12 are provided on the H side of the output waveguide 6 to cut off the output frequency, for example, 2fo, in order to efficiently extract the output wave. Radio wave absorbers (for example, quadrangular pyramids) 13 and 14 were provided to constitute an absorber.

Figure 2 shows another embodiment in which a cut-off waveguide is provided on the E plane, in which the radio wave absorber is fixed to the short-circuited part of the cut-off waveguide as in Figure 1, and the absorber It consists of

Unlike the configuration examples shown in FIGS. 1 and 2, FIG.
7 can be changed.

〔Effect of the invention〕

In any of the three examples above, the output wave is not affected by the absorber, which is composed of a cut-off waveguide that includes a radio wave 1 reflector with a relatively simple configuration, provided in the output waveguide. Therefore, the characteristics of the output wave will not deteriorate.

On the other hand, it is possible to increase the load on the output wave component having a higher frequency than the output wave.

Therefore, it is possible to attenuate the output wave component or prevent its generation, thereby stabilizing the operation of the oscillation multiplier and improving the electrical characteristics.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of one embodiment of the present invention, Fig. 2 is a block diagram of another embodiment of the present invention, Fig. 3 is a block diagram of yet another embodiment of the present invention, and Fig. 4 is a conventional block diagram. FIG. 5 shows a configuration diagram of another conventional example, and FIG. 6 shows still another configuration diagram. In the figure, 1 is a dielectric resonator, 2 is a microstrip line, 3 is a bias terminal, 4 is a negative resistance element, 5 is a resistive film, 6 is an output waveguide, and 7 is a first cutoff waveguide. , 11.12 is a cut-off waveguide, and 13.14 is a radio wave absorber. Figure 4

Claims (1)

[Claims] 1. A micro-strip line having a resistive film arranged and fixed through a dielectric resonator that resonates with the fundamental wave and a first cut-off waveguide that blocks frequencies higher than the output frequency. and an oscillation semiconductor element arranged and fixed in an output waveguide connected to the first cutoff waveguide and blocking the fundamental wave, the output An oscillation multiplier characterized in that a waveguide is provided with an absorption section that absorbs an output wave component having a frequency higher than the frequency of the output wave. 2. The absorption section has the output waveguide in an H-bend structure, and has one end as an output end and the other end as a second cutoff waveguide that blocks the output wave, and the second cutoff waveguide is configured as an output waveguide. The oscillation multiplier according to claim 1, characterized in that the oscillation multiplier has a waveguide short-circuit structure for output wave matching in which a radio wave absorber for absorbing the output wave component is provided in the wave tube. 3. The absorption section is characterized in that a second cutoff waveguide for blocking the output wave is provided near the oscillation semiconductor element, and a radio wave absorber is inserted into the second cutoff waveguide. An oscillation multiplier according to claim 1.