JPS5824202A - Microwave variable attenuator - Google Patents

Abstract

PURPOSE:To eliminate the need for isolated constitution from high frequencies and to facilitate reduction in size with simple constitution, by utilizing a photoconductive material as a microwave absorber. CONSTITUTION:The magnetic field coupling post of a waveguide 20 is provided with a photoconductor 21 and in the wall of the waveguide 20, a small hole 22 is formed to irradiate the photoconductor 21 with light as shown by an arrow. The small hole 22 is of adequate size for cutting the in-use frequency of the waveguide 20. Further, the photoconductor 21 uses CdS, PbS, etc., and the wavelength of irradiation light is selected in accordance with the spectral sensitivity of the photoconductor 21. Thus, light energy is controlled to control the amount of attenuation of a microwave, and the amount of attenuation is controlled by a control mechanism electrically isolated from a microwave, so that while the constitution is simplified, the size is reduced easily.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is based on a variable attenuation device which is provided in a photoconductive material t microwave circuit and controls the amount of intestinal fluid by light radiation. It is related to IC.

Variable reduction I [II+ is a waveguide for the conventional T-exciliary liquid.

S) A variable extinguisher that controls the attenuation amount tIII by installing a semiconductor element such as a 94% diode and a transistor in the microphone Wllra path of the VF loop, and controlling the attenuation amount tIII by controlling the DC bias, is shown, for example, by lIi1mK. As shown in FIG.
For variable reduction aSS attenuation! It gives 60% attenuation and outputs port black or b.

For example, a waveguide 4Kj (with a duck diode 7 and a liquid guide tube 60AL) having the configuration shown in the second variable range ASS may be used.
t through, and ring with the trout electric body 9*stL large post 8)
, 14m diode 7Kll current bias is added, a low pass filter is formed at the 11I output part of the post Lu, and the miter ■ wave @ is sent to the aii* via the post Lu.
Then, the direct current (I/P) applied via the 14s diode 7 and the bottom 8 is controlled, and the amount of attenuation for the microphone four-wave signal is controlled.

m5riaa my IE! With the strip line, the conventional variable reduction *S is used, 11 Hz board, 12 hamter strip twin, 15 to 1 s Hi p4vh diode, 16.17 is the bias terminal, C1 to CA are It consists of capacitance, L1 to L4 inductance, and 11 resistance.

, (, diode 13-1sam bias terminal t4.1
The impedance is controlled according to the DC bias applied to the microstrip line 12, and the amount of attenuation of the microwave signal propagating through the microstrip line 12 is controlled.

As mentioned above, in order to avoid deterioration of the conventional microwave layer's variable decay*S, a structure is required to separate the high frequency and direct current, so that the structure becomes complicated and The drawback is that it is not easy to downsize.

The present invention overcomes the drawbacks of the conventional methods described above, and uses MJlit as a photoconductive microwave collecting body, which eliminates the separation structure from the high frequency and allows for a simple structure. The purpose is to make it easier. The following implementation f'a
Details about K! I will clarify.

411 (s), (1) In the perpendicular *a and cross-section III diagrams of an embodiment of the expanded invention, the photoconductor 21 is provided at the magnetic field coupling post of the waveguide 20, and the waveguide 20 is A small hole 22 is formed in the bell, and the photoconductor 21 is irradiated with a light beam as shown by the arrow. The small hole 22 is selected to have a large heat cutoff for the frequency used by the waveguide 20. Further, as the photoconductor 21, C41°Pklj.

Pklm + PkTa + Cd1la + I 1
& etc. can be used, and the wavelength of the irradiated corner light is selected depending on the spectral sensitivity WIL of those photoconductors.

FIG. 5-), (1) Confucian cross section and cross section of another embodiment of the present invention, 23 is a waveguide, 24 is a photoconductor,
21 is a small hole. This example is an electric field experiment)
, the amount of attenuation can be controlled by the amount of energy Km irradiated onto the photoconductor 24 through one small hole 2s, as in the case of the fixed-rise assembly shown in FIG.

In addition, the irises 411-) and (&) are a cross-sectional view and a cross-sectional view of a pane-shaped embodiment of the present invention. Conductor 2
A small hole for irradiating light to 7! S-tubules are formed and large.

18 y II −), (&) is photoconductor 21.24
．． The configuration of an embodiment for irradiating 27 K light is shown, and the same I
A photodiode 31'j is connected to *so of the waveguide via an insulator 33, and a terminal 52 is connected to the K light-emitting diode 5.
A drive current of 1 N is supplied to the photoconductor 21, 24 . , 27. In this case as well, the size of the hole forming the wall SOK of the waveguide is selected to be a cutoff of the frequency used.

In addition, the stripes 7 (&) indicate that an optical fiber 35 is provided through the wall 64 of the waveguide, and light from a light source such as a light emitting diode 36 is transmitted through the optical fiber 3S to the photoconductor 21 within the waveguide. 24
．． 27, and it is preferable to have a lens effect as a spherical surface or the like on the tip of the optical fiber 55. In this embodiment, there is no restriction on the position of the light source such as the light emitting diode 56, and the optical fiber 55t having a small diameter can be easily inserted into the small hole to form a sealed structure. Furthermore, when the photoconductor 27 of the embodiment shown in FIG.
It is also possible to adopt a structure in which the photoconductor 27 is irradiated with light by penetrating the photoconductor 27. It should be noted that the technology on both sides of the photoconductor 270 is for impedance matching.

FIG. 8 is a perspective view of an embodiment of the present invention applied to a microstrip line, in which a ground conductor 41 is formed on the back side of the aluminum substrate 40, and a strip line 42 is formed on the surface. A photoconductor 4s with impedance matching is provided, and light indicated by an arrow is irradiated onto the photoconductor 45 to control the amount of attenuation.

9 is a side view of an embodiment of the present invention using a transparent substrate), 45 is a substrate made of quartz or the like, and a ground conductor 46 and a strip line 47 are provided, and the strip line 47 has an eighth A photoconductor is provided as in the illustrated embodiment. 111 diodes 48@~48 on the upper and lower surfaces of this board 4s
A light source such as . Furthermore, by arranging a plurality of light sources, the light energy TW to the photoconductor can be controlled by controlling the number of light sources.

No. 101i1 is a perspective view of an embodiment of the present invention applied to a balanced microstrip line. A photoconductor 52 is provided on the IJ tube line 51, and light is irradiated onto the photoconductor 52 as shown by the arrow. In this case as well, if the substrate is made of a transparent body such as the substrate tliX provided with the strip line 51, it is possible to have a configuration in which light is irradiated from the bottom surface as well.

11 and 12 show the pattern of the photoconductor, and in FIG. 11, the conductor portion 55 of the strip line on the substrate 54 and the photoconductor portion 56 are comb-teeth shaped. In the 12th vA pattern, the boundary between the conductor portion 58 of the strip line on the substrate 57 and the photoconductor portion 59 is not linear. ing. Photoconductor 56 by light irradiation.
5? Effect of attenuation on υi microwave signal due to resistance change of conductor section 55.58 and photoconductor section 56.5?
The resistance distribution along the interface is thought to be the largest, and the resistance distribution is changed along that interface.

Fig. 15 shows an embodiment of the nine-line method applied to the slot line, and the slot line 65 is applied between the conductors 61 and 62 on the board.
is formed, and a photoconductor 64 is provided between the conductors 61,62. Since an electric field is generated between the conductors 61 and 62, by controlling the light energy applied to the photoconductor 64, p1
It is possible to control the amount of attenuation of the microphone four-wave signal propagated through the sloctline 65.

As explained above, the present invention provides photoconductors 21.24.27.4B, 52.54.59.64 in microwave circuits such as waveguides, strip lines, and slot lines.
A light emitting diode and a laser are provided on this photoconductor.

Light is irradiated from a light source such as a lamp, and the amount of attenuation of the microphone a@ is controlled by controlling the 70 light energy tube, and the amount of attenuation is controlled by a control mechanism that is electrically separated from the microwave. The structure is simple, and the energy can be controlled by controlling the intensity and irradiation area of the light incident on the photoconductor. I can do it.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the connection between the t-chierator and the variable attenuator,
ji21i1 is a cross-sectional view of the waveguide type variable attenuator of h, 1
s5-An explanatory diagram of a conventional microstri, pline type variable attenuator, Fig. 4 (sL(s)b 5wA(荀,
) and lij diagram (8) l (1) Side section 11 ill of waveguide-shaped variable reduction aS of different embodiments of Hayashi invention
I and cross section am, 7111-), (-) are cross-sectional views of an embodiment for irradiating light to a photoconductor in a waveguide.
Figures 9 and 10 show the microstrip line type variable attenuator according to the embodiment of the present invention. This is an explanatory diagram of the pattern of the photoconductor of the type variable attenuator, and a top view of the slot twin type variable attenuator according to the embodiment of the tsgB line. 20, 23.26 are waveguides, 21.24.27.45.
52.56゜59,64 Hagill electric body, 22.2
5.241 ij small hole, 51,56°48, ~48
/ is a light emitting diode, 55 is an optical fiber, 40, 45.
54.57 is a mineral substrate, 42.51.55.58 is a strip line, and 65 is a slot line. Patent applicant Fujitsu Ltd. Representative Patent attorney Tamamushi 5 people outside the department Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 7 (a) (b) Figure 8 Figure 10 Figure 11

Claims (1)

[Claims] Waveguide, strip twin, and slot F line microphones! 11111 A miter oral fluid variable attenuator with a configuration in which a photoconductor is provided inside the wire and the light is transmitted to the opposite conductor: h The optical energy is controlled to control the amount of attenuation of the microphone U wave.