JPH02310442A - Method for measuring crossmodulation strain of resin - Google Patents

Abstract

PURPOSE:To measure the crossmodulation strain of the resin material itself by comparing the output when a 1st dielectric material is disposed and the output when a 2nd dielectric material is disposed. CONSTITUTION:The 1st dielectric material 16 is first disposed in an electrically closed cylindrical cavity 14. Input signals of different wavelengths are thereafter radiated from two input loops 22 and the output of the cylindrical cavity 14 is taken out by an output loop 40. The 2nd dielectric material 30 which consists of the same dielectric material as the 1st dielectric material 16 and is added with the resin 34 to be measured in the cylindrical cavity 14 is disposed. The input signals of different wavelengths are then radiated from the two input loops 22 and the output of the cylindrical cavity 14 is taken out in the same manner as when the 1st dielectric material 16 is disposed. The output when the 1st dielectric material 16 is disposed and the output when the 2nd dielectric material 30 is disposed are compared. The crossmodulation strain of the resin 34 added to the 2nd dielectric material 30 is then measured from the difference between these outputs.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for measuring intermodulation strain of a resin, and in particular to a novel method of measuring intermodulation strain of a resin material itself using a resonance method.

[Prior art]

Conventionally, there is no method for measuring intermodulation strain of resin materials themselves, and therefore, intermodulation strain of resin materials cannot be measured.

[Problem to be solved by the invention]

Therefore, the main object of the present invention is to provide a resin intermodulation strain measuring method that can measure the intermodulation strain of the resin material itself.

[Means to solve the problem]

This invention arranges a first dielectric or a second dielectric made of the same dielectric as the first dielectric and to which a resin to be measured is added in a cylindrical cavity whose both ends are electromagnetically closed, Input signals with different wavelengths are emitted from two input loops provided at both ends of the cylindrical cavity, and output is taken out from the cylindrical cavity by an output loop provided in the cylindrical cavity. This is a resin intermodulation strain measurement method that compares the output when a second dielectric is placed.

[Effect]

First, a first
Place the dielectric. Thereafter, input signals of different wavelengths are emitted from the two input loops, and the output of the cylindrical cavity is taken out by the output loop. Next, the second dielectric body to which the resin to be measured is added is placed inside the cylindrical cavity. Then, in the same way as when placing the first dielectric, input signals with different wavelengths are emitted from the two input loops, and the output of the cylindrical cavity is taken out. Then, the output when the first dielectric is placed and the output when the second dielectric is placed are compared. Then, from the difference in their outputs,
The intermodulation distortion of the resin to be measured added to the second dielectric can be seen.

〔Effect of the invention〕

According to this invention, the intermodulation strain of the resin itself can be measured. Therefore, the intermodulation distortion of the resin itself can be grasped in advance, which is extremely effective in designing.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

〔Example〕

FIG. 1 is an illustrative cross-sectional view showing one embodiment of the present invention.

゛The intermodulation distortion measuring device 10 of this embodiment includes a cylindrical metal case 12, which is made of, for example, a copper cylinder plated with silver, and whose inner wall has a surface roughness of 1 μm or less. It will be done. A cylindrical cavity 14 is defined by this cylindrical metal case 12 .

Cylindrical dielectric bodies 16 are fitted into both ends of the cylindrical metal case 12, respectively. The metal conductors 18 each have a cylindrical shape with a bottom and are embedded in the dielectric 16 so that the bottoms thereof are on the inside. The dielectric 16 and the metal conductor 16 cooperate to form a λ/4 dielectric coaxial resonator. Therefore, the length of both is, if λ is the wavelength of the center frequency of the electromagnetic waves used in this intermodulation distortion measuring device IO
It is set to λ/4.

The dielectric 16 and the metal conductor 18 are connected to the metal cavity 1.
This is to suppress leakage of the TEM mode from within the 4. For example, the diameter of the dielectric 16, that is, the inner diameter of the cylindrical cavity 14, is 120 mm, and the diameter of the metal conductor 18 is 8 mm.
0 mm, the dielectric constant εr of the dielectric 16 is "2", and the center frequency is 870 MHz, and the length of the dielectric 16 and the metal conductor 18 is set to 60 IM1 (=, λ/4), the band is approximately Approximately 60 dB attenuation was obtained at 100 MHz. In this way, dielectric 16 and metal conductor 18 act as closure means at both ends of cylindrical cavity 14.

Note that if the dielectric constant εr of the dielectric 16 is increased (then λ/
4 can be shortened, and therefore the size can be reduced.

Cables 20 are respectively disposed in the center of the metal conductors 18 so as to pass through the dielectric 16, as best seen in FIG. 2A. The core wire of the cable 20 is a metal conductor 18
The core wire, which is insulated from the cylindrical cavity 14 and projects into the cylindrical cavity 14, constitutes an Alford loop, as best seen in FIG. 2B, thereby forming the input loop 22.

A support base 24 made of styrofoam, for example, is disposed within the cylindrical cavity 14 . And support stand 2
4, separated by a predetermined interval with two spacers 26,
Dielectric resonators 28 and 30 as dielectrics to be measured are fixed. The dielectric resonator 28 has a relative dielectric constant εr of “38
'', for example, from a dielectric material (Zr-3n) Ti14, etc., and is formed into a substantially donut shape. Dielectric resonator 3
0 is also formed in a substantially donut shape, but as shown in the cross-sectional perspective view of FIG.
The resin portion 34 is formed by dividing into two parts. The annular portion 32 of the dielectric resonator 30 is formed from a dielectric (Zr.5n) TiO4 having the same dielectric constant as the dielectric resonator 28, but the resin portion 34 has a dielectric constant εr of 6 to 7. An example of this is glass glaze.

Note that three dielectric resonators 28 are initially fixed to the support base 24. In this state, after detecting the output of the output loop as described later, as shown in FIG. Replace with Therefore, in FIG. 1, one dielectric resonator 28 and two dielectric resonators 30 are shown fixed on the support base 24, and as will be described later, in this state, the output is again output. The output of the loop is detected. Further, the dielectric resonators 28 and 30 are configured as hollow dielectric resonators, and there are two input channels 122 on the axis thereof.
The center of is placed.

On both sides of the support base 24, between the input loop 22 and the input loop 22, another support base 3 also made of styrofoam is provided.
6 is placed. A trap resonator 38 is fixed on this support base 36 . This trap resonator 38 is also configured as a hollow dielectric resonator, and its axis is parallel to the dielectric resonator 2.
arranged to coincide with that of the day and 30.

The trap resonators 38 each have one input cable 122.
The trap resonator 38 acts as a filter for mutually blocking the input signals radiated from the input channels 122, i.e., the trap resonator 38 located on the right side blocks the input signals radiated from the input channel 122 on the left side, The trapped resonator 38 blocks the input signal radiated from the right input cable 122.

It is conceivable to provide a filter corresponding to this trap resonator 38 outside the cylindrical cavity 14, but if it is provided outside, the resonant electromagnetic field of the dielectric resonators 28 and 30 will be applied to the external filter. Because it extends to
It has been found that the intermodulation signal generated in the input loop 22 portion mixes into the dielectric resonators 28 and 30 together with the input signal, reducing measurement accuracy. Therefore, by arranging the trap resonator 38 between the dielectric resonators 28 and 3o and the input loop 22, the resonant electromagnetic fields of the dielectric resonators 28 and 30 are confined between the trap resonators 38, and one input The other input to loop 22 - 12
This is to prevent intermodulation signals from 2 from having any influence. Then, by adjusting the distance between the dielectric resonators 28 and 30 and the trap resonator 38, the two are critically coupled.

Furthermore, approximately at the center in the longitudinal direction of the cylindrical cavity 14,
For example, a T-shaped output loop 40 is arranged. This output loop 40 is also formed using the core wire of the cable 42, just as the input loop 22 is formed using the core wire of the cable 20.

A measurement system using such an intermodulation distortion measurement device 10 is as follows.
It is constructed as shown in FIG. For example, a high-frequency signal with a frequency r□ from a signal source 44 composed of a high-output oscillator or the like is adjusted to a predetermined voltage level, and then provided to one input loop 22 of the intermodulation distortion measuring device 10 via a circulator. . Frequency f2 from another signal source 46
After the high frequency signal is adjusted to a predetermined voltage level, it is applied to the other input signal 122 via a circulator. Then, for example, when three dielectric resonators 28 are fixed to the support base 24, the three dielectric resonators 28
An intermodulated wave is formed by the input signals of frequencies f1 and f2 and is confined within the cylindrical cavity 14. Therefore, from the output cull 140, for example, a third-order intermodulation signal of frequency f3H is taken out together with two input signals of frequencies f1 and f2. This output signal is then passed through a bandpass filter 48 and an amplifier 5.
0 and is input to the spectrum analyzer 52.

On the other hand, even when one dielectric resonator 28 and two dielectric resonators 30 are fixed to the support base 24 as shown in FIG. 1, intermodulated waves of frequencies f and f2 are formed. , is confined within the cylindrical cavity 14. and,
The output loop 40 outputs two input signals of frequencies f1 and f2 as well as, for example, a third-order intermodulation signal of frequency f3H', which is input to the spectrum analyzer 52.

Therefore, the data of the spectrum analyzer 52 with the three dielectric resonators 28 mounted on the support base 24 and the data of the one
Data from the spectrum analyzer 52 with one dielectric resonator 28 and two dielectric resonators 30 arranged will be compared.

In an experiment, under an electric field strength of 5 V/shell and with three dielectric valve vibrators 28 fixed, the intermodulation distortion was 11
It was 70dB. On the other hand, when one dielectric resonator 28 and two dielectric resonators 30 were arranged under the same electric field strength, the electric field strength was -160 dB. That is, as shown in FIG.
If 4 is added, the intermodulation distortion will be inferior by 10 dB. Therefore, from this result, if the resin part 34 is formed of a glass glaze having a dielectric constant εr of "6 to 7", the intermodulation distortion of the glass glaze itself can be calculated.

Furthermore, even if the resin part 34 is made of another resin material instead of glass glaze, the intermodulation strain of the resin material itself can be calculated using the same principle. The number of resonant modes and resonant frequency used for this are appropriately selected, and are not limited to the third order, but may be, for example, a fifth or higher order resonant frequency. The mode is also TE mode, TM
In addition to modes, it can also be applied to higher-order modes.

[Brief explanation of the drawing]

FIG. 1 is an illustrative cross-sectional view showing one embodiment of the present invention. 2A is a sectional view showing the dielectric and metal conductors of the embodiment shown in FIG. 1, and FIG. 2B is an inner end view thereof also showing the input loop. FIG. 3 is a cross-sectional perspective view of the dielectric resonator to which the resin to be measured used in the embodiment of FIG. 1 is added. FIG. 4 is a block diagram showing a measurement system constructed by the apparatus of the embodiment shown in FIG. In the figure, 10 is an intermodulation strain measurement device, 12 is a cylindrical metal case, 14 is a cylindrical cavity, 16 is a dielectric material, and 18 is a cylindrical cavity.
22 is a metal conductor, 22 is an input loop, 24 and 36 are supports, 28 and 30 are dielectric resonators, 38 is a trap resonator, and 40 is an output loop. Patent Applicant Murata Manufacturing Co., Ltd. Agent Patent Attorney Yama 1) Yoshihito Figure 1 World Figure 2A Figure 28 Figure 3 Hi Figure 4

Claims (1)

[Claims] A first dielectric or a second dielectric made of the same dielectric as the first dielectric and to which a resin to be measured is added is placed in a cylindrical cavity whose both ends are electromagnetically closed; Emit input signals with different wavelengths from two input loops provided at both ends of the cylindrical cavity, take out an output from the cylindrical cavity by an output loop provided in the cylindrical cavity, and place the first dielectric body. A method for measuring intermodulation distortion of a resin, which compares the output when the second dielectric and the second dielectric are arranged.