JPS6098702A - Dielectric resonator type band-pass filter - Google Patents

Abstract

PURPOSE:To attain ease of adjustment and improvement of massproductivity by adding a metallic screw for adjustment between adjacent resonators. CONSTITUTION:The amount of coupling between dielectric resonators is decided by the magnetic coupling amount between the dielectric resonators 1 and 2. The inside depth (a) of a chassis 15 is the cut-off wavelength in the operating frequency and the amount of magnetic coupling depends on the strength of the electromagnetic field propagated by a distance S12 in the cut-off waveguide consisting of the chassis 15 and a cover 16. Since the adjusting screw 32 acts like a capacitive component, the cut-off wavelength is lowered equivalently by putting it in the chassis 15, the attenuation of the electromagnetic wave propagated between the dielectric resonators 1 and 2 is decreased and the coupling amount is increased. In loosening the screw 32 conversely, the coupling amount between the dielectric resonators 1 and 2 is decreased. The coupling amount k12 is changed without charging the position of the dielectric resonators by using the screw 32.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an improvement in a p-wave bandpass device using a dielectric resonator.

[Prior art]

Dielectric Re5onator (hereinafter referred to as DR bandpass waver)
), it has traditionally been important to widen the frequency variable range. In the conventional DR bandpass p-wave device of this kind, a method is used as the two-frequency variable mechanism, for example, by bringing the end face of a metal screw close to the dielectric resonator.

FIG. 1 is a diagram showing an example of the structure of a conventional DR bandpass F-wave device, in which (a) is a front sectional view, and (b) is a top view with the cover removed. In Fig. 1, 1 to 4 are dielectric resonators, 11 to 14 are supports supporting the dielectric resonators 1 to 4, respectively, and 2 are the Q of the dielectric resonators.
A material that does not deteriorate the (unloaded Q) as much as possible is used. 15 is a metal shear, 16 is a metal cover, and the cover 16 has a metal screw 2 for frequency adjustment.
1 to 24 are seated approximately at the center between the dielectric resonators, and by adjusting the 9μ spacing between each dielectric resonator 1 to 4 and one of the metal screws 21 to 24. You can adjust the frequency.

25 and 26 are input/output connectors, dielectric resonator 1
and a glove for individually electromagnetically coupling with 4, 2
7 and 28 are marked. I will explain them individually later, but + LA + S 12 r S 23 +s
Gate 41 LB indicates physical magnanimity + (Qe)Ark
12 rk 231 k 341 (Qe)B indicates electrical coupling.

By using multiple dielectric resonators as shown in Figure 1 (first
In the figure, it depends on the amount of binding with l and 4).

FIG. 2 is a diagram showing the waveform of the well-known non-pass characteristic of the above-mentioned DR band band-pass liquid wave device, in which one frequency ω0, ωl
, and ω2 are values that can be easily calculated from the illustrated waveforms.

The following description will be made with reference to FIGS. 1 and 2, but it is assumed that the number of dielectric resonators is n, unlike the four in FIG. 1. The input/output electromagnetic coupling amount is (Qe)A and (Q
e) If it is B and the amount of coupling between the j-th and j+1-th dielectric resonators is expressed as.

It rains on gj+1. Here ω1' + gol gj...
・gn+1 is.

This is the theoretical value for n filters,
ω0. ω4. ω2 is R band pass p as shown in Figure 2.
This is the amount obtained in the example of the wave transmitter's pass characteristic, and W is ω obtained as above. , ω1°ω2, and corresponds to the bandwidth. As mentioned above, ω1'+
gol gl...gn+1 is a value determined from filter theory, so the band ω2-ω1 and 13PF
When the center frequency ω is determined, (Qe)A, (Qe)B, and kj, j+1 are uniquely determined.

Now, in an actual DR bandpass liquid wave device as shown in FIG. Mutual coupling between dielectric resonators is determined by magnetic coupling using resonance modes TEo, δ. Therefore, the amount of coupling is determined by the spacing J, j−H ”j, j+1 of the dielectric resonators, and the amount of input and output coupling (Qe)
A.

(Qe)B is determined by the distances LA and LB between the input and output probes, the input and output side dielectrics, respectively. Considering the above example of 4 stages in Figure 1, the amount of coupling is 12°k23
．． and 34 is the interval S 12 r S 231 S 3
4, it is logically determined D, (qe)A, (qe)
B is determined by distances LA and LB.

Next, returning to the general case of n stages, the required center frequency ω
. When the bandwidth ω2-ω1 is determined, according to the theory, J, J, 4
−1 y, (Qe)Ar (Qe)B is determined →−
I←Kyo, therefore the dimension that realizes the mountain Sj+j+1' L
A I Ln is determined and the DR bandpass liquid wave device design,
It will be produced.

However, the conventional configuration example shown in FIG. 1 has the following drawbacks. That is, when a filter is actually manufactured to realize LA, LB, S, . Due to installation errors of connectors 25 and 26, LAr LB'S
LJ+1 etc. will not work as designed. In such a state, the set value (Qe)A.

(Qe)n, kj, j-N cannot be obtained, and the desired filter characteristics cannot be obtained, so the filter must be adjusted while finely adjusting L8.

Taking the case of four stages in FIG. 1 as an example, if the distance SI2 is finely adjusted, S23 will also be affected. Therefore, if 823 is corrected next to fine-tune it, it will affect S34. That is, since each interval influences each other, it takes a very large amount of time to finely adjust the position of the dielectric resonator and correct various dimensional errors. In other words, it can be said that the configuration is unsuitable for mass production and has no design quality.

[Object of the Invention] Therefore, the object of the present invention is to provide a D
'R-band bandpass device is intended to be provided.

Blank space below [Structure of the Invention] According to the present invention, a cut-off waveguide is provided in which a plurality of dielectric resonators and the same number of frequency adjustment screws facing each of these dielectric resonators are arranged between a pair of input/output circuits. Tubular bandpass F
A dielectric resonator bandpass P in which an adjusting metal screw is added between adjacent dielectric resonators and between the dielectric resonators at both ends and the input/output circuit of the pair. A wave device is obtained.

〔Example〕

FIG. 3 is a diagram showing the configuration of an embodiment of the present invention. 1st
Components having the same functions as those in the figures are given the same numbers. In this example, 31 to 35 are added.
This is the adjustment metal screw shown in . As mentioned above, the amount of coupling between the dielectric resonators and the amount of coupling between the input/output circuit and the dielectric resonators at both ends are determined by the amount of coupling between the dielectric resonators placed in the cut-off waveguide consisting of the chassis 15 and the cover 16. resonance mode TEo,
It is determined by the amount of magnetic coupling using δ. Therefore, if we could freely vary the amount of magnetic coupling by some means.

The amount of coupling (Qe) A is due to various dimensional errors such as dimensional errors in mounting the dielectric resonator, cutting dimensional errors in the chassis 15, and errors in mounting the globes 27 and 28.

Even if (Qe)++, IJ, and 4+1 change from the design values, they can be returned to the design values. In the present invention, metal adjusting screws shown at 31 to 35 in FIG. 3 are used as the adjusting means.

Next, a description will be given of how the amount of coupling between the dielectric resonators and the amount of coupling between input and output changes by adjusting the adjusting metal screw shown in FIG. 3. First, to explain the amount of mutual coupling between dielectric resonators, taking dielectric resonators 1 and 2 as an example, the amount of mutual coupling between dielectric resonators is determined by the amount of mutual magnetic coupling between dielectric resonators 1 and 2. . In addition, the internal depth a of the chassis 15 is the cutoff wavelength at the operating frequency, and the amount of magnetic coupling is determined by the distance S in the cutoff waveguide.
12 is determined by the magnitude of the electromagnetic field that propagates. In this case, the adjusting metal web 32) according to the present invention acts as a capacitor, so as it is introduced into the 7-layer 715, that is, when the distance t becomes thicker, the cut-off wavelength becomes lower equivalently. Otherwise, the amount of attenuation of the electromagnetic field propagating between the dielectric resonators 1 and 2 decreases, and the amount of coupling increases. Conversely, as the metal screw 32 is removed, that is, as t becomes smaller, the cutoff wavelength becomes higher and the amount of coupling between the dielectric resonators 1 and 2 becomes smaller. In this way, adjust the metal screw 3.
2, the coupling amount k can be calculated without changing the position of the dielectric resonator.
12 can be changed.

The number indicates the width inside the 7-palm 15.

FIG. 4 is a diagram showing actually measured values when the coupling amount k12 is changed by the movement of the metal screw 32 (change in t). distance a
, b+stz are shown in the figure.

As can be readily seen from the figure, the amount of binding can be varied considerably.

The above describes the adjustment of the coupling amount k12 according to the present invention when dielectric resonators 1 and 2 are used, but in the same way, the coupling amount 23 is adjusted by the screw 33, and the coupling amount 34 is adjusted by the screw 3.
4 can be adjusted.

More generally, the amount of binding can be adjusted.

J+J+1 Next, a method of adjusting the input/output coupling amounts (Qe)A and (Qe)B will be explained. The dielectric resonator closest to the input/output circuit (1 and 4 in Figure 1) and the probe 27 of the input/output circuit
and 28 are magnetically coupled through cut-off waveguides. Therefore, the method of adjusting +1 to the amount of coupling between dielectric resonators can also be applied directly to adjusting the amount of coupling (Qe)A of the crowd J+J force. To explain the input/output coupling amount (Qe) A as an example, as the metal screw 31 is inserted between the input/output prologue 27 and the dielectric resonator 1, that is, as the distance t' increases, it becomes 2 equivalent. Therefore, the cutoff wavelength has become lower, and the amount of coupling between the globe 27 and the dielectric resonator l has become stronger, (Qe)A
becomes lower. The same applies to (Qe)B.

Figure 5 shows the present invention! Actual measurement data when adjusting 1l(Qe)A is shown. The magnitude of the change in (Qe)A shown in this figure shows that it is sufficiently useful for adjustment.

〔Effect of the invention〕

As can be seen from the above description, in the DR bandpass p-wave device according to the present invention, the adjustment metal screw can be used to adjust the dielectric resonator without moving the position of the dielectric resonator.

(Qe)A and (Qe)B can be varied, and dimensional errors during manufacturing can be absorbed to easily obtain a design value band. 2. Also, the bandpass filter band can be varied over a wide range if necessary.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of the structure of a conventional DR bandpass p-wave device, FIG. 2 is a diagram showing an example of the passage characteristics of the DR bandpass liquid wave device in FIG. A diagram showing the configuration of one embodiment, FIG. 4 is a diagram for explaining the adjustment of the amount of coupling between the dielectric resonators of the r-wave generator shown in FIG. 3, and FIG. 5 is a diagram of the ν-wave generator shown in FIG. 3. FIG. 2 is a diagram illustrating adjustment of the amount of input/output coupling. Explanation of symbols: 1 to 4 are dielectric resonators, 11 to 14 are support stands, 15 is a chassis, and 16 is a cover. 21 to 24 are metal screws for frequency adjustment, 25 and 26 are input/output connectors, 27 and 28 are Zorobes, 31 to 34 are metal screws for adjustment, and -4゛B. Figure 2 Frequency costs

Claims (1)

[Claims] ■ In a cut-off waveguide type bandpass p-wave device in which a plurality of dielectric resonators and the same number of frequency adjustment screws facing each of these dielectric resonators are arranged between a pair of input and output circuits, adjacent 1. A dielectric co-installed band-pass wave transducer, characterized in that adjustment metal screws are added between matching dielectric resonators and between the dielectric resonators at both ends and the pair of output circuits.