JPH0514005A - Polar dielectric filter - Google Patents

Abstract

PURPOSE:To realize the polar dielectric filter easily manufactured at a low cost in which the coupling quantity and the phase for polarization are easily adjusted. CONSTITUTION:The filter is provided with an outer case 1 of a standard waveguide size, an inner case 2 inserted thereto, and the inner case 2 is provided with a cut-off waveguide 3, a dielectric resonator 4 arranged in the waveguide 3, a waveguide branch path 5 provided in opposition to an H plane of the outer case 1, and coupling probes 6a, 6b provided between the cut-off waveguide 3 and the waveguide branch path 5. The coupling quantity for polarization is adjusted by using polar coupling adjustment members 7a, 7b provided in the vicinity of a face of the outer case 1 opposite to the coupling probes 6a, 6b and the length of phase is adjusted by using at least a couple of phase adjustment members 8a, 8b provided on the way of the said face opposite to the waveguide branch path 5. Or the waveguide path is provided in opposition to the E plane of the outer case and the waveguide branch path is filled by a dielectric body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarized dielectric filter, and more specifically to a dielectric filter in which a dielectric resonator is arranged in a cut-off waveguide, and a portion of electromagnetic energy in the main path is removed. The present invention relates to a polar dielectric filter having a so-called polar type filter characteristic by shunting and recombining the shunt with a main path with a predetermined phase length.

Today, this type of polar dielectric filter is
Its compact size and sharp bandpass characteristics make it indispensable for microwave band communication equipment. Therefore, it is desired to provide a polar dielectric filter which is easy to manufacture, low in cost, and capable of easily adjusting a coupling amount and a phase for polar.

[0003]

2. Description of the Related Art FIG. 12 illustrates the characteristics of a polarized dielectric filter.
12A shows the non-polar filter characteristic.
FIG. 12B is a diagram showing a polar filter characteristic.
It As is well known, waveguides have the characteristics of high pass filters.
And its cutoff wavelength λ _CIs the width of the magnetic field surface of the waveguide
Then λ_C= 2a. Therefore, the first
Cutoff frequency f₁A part of the waveguide with
With a narrow cut-off waveguide, the cutoff frequency of the waveguide
Is the higher second cutoff frequency f₂Move to this
By placing a dielectric resonator inside the turn-off waveguide,
1st and 2nd cutoff frequency f₁, F₂Between dielectric resonators
Resonance frequency f₀Predetermined bandpass characteristics centered on
A pole filter characteristic) is obtained.

However, a sharp bandpass characteristic cannot be obtained only with such a dielectric filter, and in order to realize this, it is necessary to provide dielectric filters in multiple stages.
It cannot be made small as a whole. Therefore, a sharp bandpass characteristic (polarized filter characteristic) is obtained by shunting a part of the electromagnetic energy of the main path and recombining it with a predetermined phase length into the main path.

FIG. 10 is a diagram showing the structure of a conventional polar type dielectric filter, in which 51 is a housing and 51a and 51b.
Is a flange surface of the housing, 52 is a cutoff waveguide, 53 is a dielectric resonator, 54 is a supporting member thereof, 55 is a coaxial cable, 56a and 56b are coupling probes, 57a and 57b are alignment knock pins, and 61 Is a lid member, 61a, 6
1b is a flange surface of the lid member, 62 is a screw member for adjusting the resonance frequency of the dielectric resonator, and 63 is a screw hole thereof.

This polarized dielectric filter is completed by fitting the case 51 and the lid member 61 together and fixing them with screws. In this state, when an electromagnetic wave arrives in the direction of arrow a, the cutoff waveguide 52 and the dielectric resonator 54 act to cause the main path to have a predetermined bandwidth centered on the resonance frequency of the dielectric resonator 54. Although electromagnetic waves pass through, at the same time, a part of the electromagnetic energy of the main path is shunted via the coupling probe 56a, the phase of this is adjusted to a predetermined phase length according to the length of the coaxial cable 55, and the coupling probe 56b is also used. A polar filter characteristic is obtained by re-coupling with the main path at.

As described above, the conventional polar dielectric filter has a structure in which the housing 51 and the lid member 61 are fitted together. By the way, such a polar dielectric filter is
In order to connect with other waveguides, it is necessary to use a standard size waveguide as a whole.
It is necessary to cut out the housing 51 and the lid member 61 from a large metal block such as brass, which is disadvantageous in that the material cost and the processing cost are high.

Moreover, after the housing 51 and the lid member 61 are fitted together, it is necessary to re-process the flange surfaces 51a, 51b and 61a, 61b on both sides so that they are flush with each other. The time and effort for processing have also increased. Further, from the electrical side, since the coaxial cable 55 is conventionally used for the shunt, if the phase length of the shunt is changed, various types of coaxial cables of different lengths are required. However, there was a drawback that these had to be replaced one by one.

Furthermore, conventionally, the binding probe 56a,
Since the position and shape of 56b are fixed as shown in the figure, there is a problem in that the amount of coupling for polarization cannot be adjusted arbitrarily. By the way, regarding this problem, in the lid member 61 of FIG. 10, each screw hole is provided in the vicinity of the surface facing the coupling probes 56a and 56b, and the metal screws 64a and 64b are erected there, so that It is conceivable to finely adjust the amount of coupling of the metal screws 64a and 64b by taking them in and out. However, this method is inconvenient from the following points.

FIG. 11 is a sectional view showing the details of a conventional coupling probe section. In the figure, 53 is a dielectric resonator and 51 is a resonator.
Is a part of the casing, 58 is an insulator such as Teflon, 56b is a coupling probe, 59 is a portion where the tip of the coupling probe is soldered to a part of the casing, 55 is a coaxial cable, 55a is a coaxial connector, and 64b is It is a metal screw that adjusts the amount of coupling for polarized.

The dielectric resonator 53 resonates in the TE ₀₁ δ mode by coupling with the magnetic field H ₄ from the preceding stage. on the other hand,
Electromagnetic energy of a predetermined phase length from the coaxial cable 55 is a high-frequency current flows in the microwave band to the soldering portion of the binding probe 56b is supplied to the housing 51, the magnetic field H ₅ dielectric resonator caused by this It is combined with the device 53 to form a polarized filter characteristic. Therefore, the binding probe 5
If a metal screw 64b is brought close to 6b as shown,
The coupling amount of the magnetic field is changed, and the coupling amount for the polar can be changed. However, since the metal screw 64b is also close to the dielectric resonator 53 at the same time, if the coupling amount for polarization is changed, the resonance frequency of the dielectric resonator 53 also changes at the same time, which makes adjustment work extremely difficult. It will be something like. This can also be said on the side of the binding probe 56a.

[0012]

As described above, the conventional polarized dielectric filter has problems that it is difficult to manufacture, the material cost is high, and it is difficult to adjust the coupling amount and the phase for the polar. there were. An object of the present invention is to provide a polar type dielectric filter which is easy to manufacture, low in cost, and capable of easily adjusting a coupling amount and a phase for polarizing.

[0013]

The above-mentioned problems can be solved by the structure shown in FIG. That is, the polarized dielectric filter of the present invention comprises an outer housing 1 having a standard waveguide size and an inner housing 2 which is fitted and fixed to the outer housing 1, and the inner housing 2 is A cutoff waveguide 3 provided in parallel with the tube axis of the outer casing 1, a dielectric resonator 4 arranged in the cutoff waveguide 3, and a cutoff waveguide 3 provided so as to face the H surface of the outer casing 1. The waveguide shunt 5 and the coupling probes 6a and 6b provided between the cutoff waveguide 3 and the waveguide shunt 5.

Preferably, polar coupling adjusting members 7a and 7b are provided near the surface of the outer casing 1 that faces the coupling probes 6a and 6b of the waveguide shunt 5. Further, preferably, at least one pair of phase adjusting members 8a and 8b is provided in the middle of the surface of the outer housing 1 facing the waveguide shunt 5. Further, the above problem is solved by the configuration of FIG. That is, the polarized dielectric filter of the present invention comprises an outer housing 1 having a standard waveguide size and an inner housing 2 which is fitted and fixed to the outer housing 1, and the inner housing 2 is A cutoff waveguide 3 provided in parallel with the tube axis of the outer casing 1, a dielectric resonator 4 arranged in the cutoff waveguide 3, and a cutoff waveguide 3 provided so as to face the E surface of the outer casing 1. A waveguide shunt 9, a dielectric member 10 fitted into the waveguide shunt 9, and coupling probes 6a and 6b provided between the cutoff waveguide 3 and the waveguide shunt 9. Equipped with.

Further, preferably, polar coupling adjusting members 7a and 7b are provided in the outer casing 1 near the surface of the waveguide shunt 9 that faces the coupling probes 6a and 6b. Further, preferably, at least one pair of phase adjusting members 8a and 8b is provided in the middle of the surface of the outer housing 1 facing the waveguide shunt 9.

[0016]

The polarized dielectric filter of the present invention shown in FIG.
This is completed by inserting and fixing the inner casing 2 into the outer casing 1 having a standard waveguide size. In this state, when an electromagnetic wave arrives in the direction of arrow a, the cutoff waveguide 3 and the dielectric resonator 4 act to cause the main path to have a predetermined bandwidth centered on the resonance frequency of the dielectric resonator 4. Electromagnetic waves pass through, but at the same time,
A part of the electromagnetic energy of the main path is shunted via the coupling probe 6a, and the phase is adjusted to a predetermined phase length by a waveguide shunt 5 provided so as to face the H surface of the outer casing 1. In addition, a polar filter characteristic is obtained by recoupling to the main path with the coupling probe 6b.

Since the polarized dielectric filter of the present invention has a structure in which the inner housing 2 is fitted and fixed to the outer housing 1 having a standard waveguide size, the outer housing 1 is provided with a standard standard conductor. In addition to being able to use a wave tube, the inner housing 2 can be made from a small metal block and is therefore easy to manufacture and has a low material cost. Further, in the inner housing 2, a waveguide branch 5 is provided so as to face the H surface of the outer housing 1, and the cutoff waveguide 3 is provided.
And the waveguide shunt 5 are coupled by coupling probes 6a and 6b.

As a result, the adjustment of the coupling amount to the waveguide shunt 5 and the coupling amount to the main route, which are important in adjusting the polar filter characteristics, are adjusted in the waveguide of the outer casing 1. This is performed by bringing polar coupling adjustment members 7a, 7b, which are provided, for example, metal screws, provided near the surface of the tube shunt 5 facing the coupling probes 6a, 6b, toward or away from the coupling probes 6a, 6b. In this way, since the metal screws 7a and 7b are separated from the dielectric resonator 4, the coupling amount can be adjusted without affecting the resonance frequency of the dielectric resonator 4.

In general, the dielectric resonator 4 has a deviation in resonance frequency due to a dimensional error. Reference numeral 11 is a screw member for adjusting the resonance frequency of the dielectric resonator, and 12 is a screw hole thereof, by which the resonance frequency can be adjusted independently for each dielectric resonator. Further, adjustment of the phase length of the waveguide shunt 5, which is important in adjusting the polar filter characteristics, is performed by, for example, providing in the middle of the surface of the outer casing 1 facing the waveguide shunt 5. This is performed with at least one pair of phase adjusting members 8a and 8b made of metal screws or dielectric screws. By doing so, for example, by finely adjusting the amount of protrusion of the metal screws 8a and 8b into the waveguide shunt 5, it is possible to realize a phase adjustment in which the phase is accurately reversed at the pole frequency. Accurate phase adjustment can be performed without replacing the coaxial cables one by one.

The polarized dielectric filter of the present invention shown in FIG. 2 is completed by inserting and fixing the inner casing 2 into the outer casing 1 having a standard waveguide size. In this state, when an electromagnetic wave arrives in the direction of arrow a, the cutoff waveguide 3 and the dielectric resonator 4 act to cause the main path to have a predetermined bandwidth centered on the resonance frequency of the dielectric resonator 4. Electromagnetic waves pass through, but at the same time, a part of the electromagnetic energy of the main path is shunted via the coupling probe 6a, and this is provided so as to face the E surface of the outer casing 1 and the inside is a dielectric member. A polarized filter characteristic is obtained by adjusting the phase to a predetermined phase length in the waveguide branch 9 filled with 10 and recombining it with the main path by the coupling probe 6b.

In the polarized dielectric filter shown in FIG. 2, since the waveguide branch 9 is provided so as to face the E surface of the outer casing 1, the waveguide branch 9 is narrow as it is. It becomes a cutoff and cannot be a shunt. Therefore, the dielectric member 10 is inserted to shorten the wavelength so that the dielectric resonator 4 serves as a waveguide near the resonance frequency. With such a structure, the depth w of the cut-off waveguide 3 can be made larger than that in the case of FIG. 1, so that the unloaded Q of the dielectric filter can be made large and the passage loss can be reduced. There is an advantage that it can be reduced. It should be noted that other actions can be considered as in the case of FIG.

[0022]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The same reference numerals denote the same or corresponding parts throughout the drawings. 3A and 3B are views showing the configuration of the inner housing of the polarized dielectric filter of the first embodiment. FIG. 3A is a front perspective view thereof, and FIG. 3B is FIG. 3A.
FIG. 7 is a rear perspective view seen from the direction of arrow b in FIG.

In the figure, 2 is an inner housing, 3 is a cut-off waveguide, 4 is a dielectric resonator, 4a is a supporting member of the dielectric resonator, and 5 is so as to face the H surface of the outer housing 1. 6a and 6b are coupling probes, 7a and 7b are polar coupling adjusting members, 8a and 8b are phase adjusting members, and 11 is a resonance frequency adjusting member provided for each dielectric resonator. Screw member,
12 is the screw hole.

Such an inner housing 2 can be machined from a metal block of brass or the like having a standard waveguide size, and since it is not necessary to provide a flange surface on the inner housing 2, it is easy to manufacture. , Material cost is low. Further, in the inner housing 2, the waveguide shunt 5 provided so as to face the H surface of the outer housing 1 has a sufficient width in the direction of the H surface, so that resonance of the dielectric resonator 4 occurs. It can be configured so that the cutoff does not occur near the frequency. Furthermore, the coupling probes 6a and 6b are provided substantially on the center line K of the waveguide shunt 5, so that the electromagnetic field induced by the coupling probe 6a is guided by the waveguide shunt 5.
It propagates in a mode without distortion and is coupled to the coupling probe 6b.

The polarized coupling adjusting members 7a, 7b are made of, for example, metal screws, and are actually provided in the vicinity of the surface of the outer casing 1 facing the coupling probes 6a, 6b. As a result, the metal screws 7a and 7b can be moved closer to or farther from the coupling probes 6a and 6b at positions apart from the dielectric resonator 4, and therefore, the resonance frequency of the dielectric resonator 4 can be prevented from being affected. You can adjust the binding amount for. On the other hand, the resonance frequency of each electric resonator 4 can be adjusted independently by the screw member 11 for adjusting the resonance frequency inserted in each screw hole 12.

Further, the phase adjusting members 8a and 8b are made of, for example, metal screws, dielectric screws, conductor rods, etc., and actually, in the outer casing 1, a substantially center line K of the waveguide branch 5 is formed. It is provided in the middle of the facing surface. This allows the waveguide shunt 5
The amount of protrusion of the metal screws 8a, 8b, etc. can be finely adjusted, and the phase can be adjusted so that the phase is accurately reversed at the pole frequency. Therefore, accurate phase adjustment can be easily performed without replacing the coaxial cables one by one as in the conventional case.

FIG. 4 is a sectional view showing the details of the coupled probe portion of the embodiment. In FIG. 4, 3 is a cut-off waveguide and 4 is a cut-off waveguide.
Is a dielectric resonator, 2 is a part of the inner casing, 13 is an insulator such as Teflon, 6a is a coupling probe, 14 and 15 are portions where the tip of the coupling probe is soldered to a part of the casing,
Reference numeral 5 is a waveguide shunt, and 7a is a polar coupling adjusting member made of, for example, a metal screw.

When an electromagnetic wave arrives in the direction of arrow a, a part of the magnetic field H ₁ goes into the cutoff waveguide 3 and couples with the dielectric resonator 4, and the dielectric resonator 4 TE ₀₁ δ. Resonates in mode. In the TE ₀₁ δ mode, there is a magnetic field leaking around the dielectric resonator 4, a part of the magnetic field H ₂ is coupled to the coupling probe 6a, and microwaves are applied to both soldered portions of the coupling probe 6a. A high-frequency current in the band flows and an electromagnetic field is induced in the waveguide shunt 5. Then, when the metal screw 7a is moved toward or away from the coupling probe 6a in this state, the reactance of the coupling probe 6a seen from the dielectric resonator 4 changes, and as a result, the coupling between the dielectric resonator 4 and the coupling probe 6a is performed. The amount changes. If the amount of binding changes,
The electromagnetic energy propagating through the waveguide shunt 5 also changes, thus adjusting the amount of coupling to the waveguide shunt 5 is dependent on the dielectric resonator 4
This can be performed with almost no effect on the resonance frequency of. The same applies to the adjustment of the amount of binding to the main path in the binding probe 6b.

FIG. 5 is a sectional view showing the details of the phase adjusting portion of the embodiment. In the figure, 1 is a part of the outer housing, 2 is a part of the inner housing, and 5 is a waveguide shunt. Reference numerals 8a and 8b are phase adjusting members made of, for example, metal screws. It is known that when a metal rod is inserted parallel to the electric field E on the center line of the waveguide, the metal rod acts as a capacitance when the insertion amount d is within the range of d <λ / 4. In the present embodiment, as shown in FIG. 3, a pair of metal screws 8a and 8b are provided midway on the substantially center line K of the waveguide shunt 5, and if the metal screws 8a and 8b are taken in and out,
The capacitance component of the line changes. Therefore, the substantial phase length of the waveguide branch 5 can be adjusted. Further, metal screws 8a, 8b
By setting the distance l between them to be approximately λ / 4, the phase difference between the component reflected by the mismatch due to the insertion of the metal screw 8a and the component reflected by the mismatch due to the insertion of the metal screw 8b is approximately λ.
Since it becomes / 2, both are canceled out, and this enables adjustment of only the phase at a predetermined frequency.

FIG. 6 is an assembly diagram of the polarized dielectric filter of the first embodiment. In the figure, 1 is an outer casing of a standard waveguide size, 1a and 1b are their flange faces, and 2 is an outer casing 1. It is the inner housing of FIG. Further 7a, 7b
Is a polarized coupling adjusting member, 8a and 8b are phase adjusting members,
Reference numeral 11 is a screw member for adjusting the resonance frequency, and 12 is a screw hole thereof.

The polarized dielectric filter of the first embodiment is completed by inserting the inner casing 2 into the outer casing 1 of the standard waveguide size and screwing it. In this state, when an electromagnetic wave arrives in the direction of arrow a, the cutoff waveguide 3 and the dielectric resonator 4
By the action of and, an electromagnetic wave having a predetermined bandwidth centered on the resonance frequency of the dielectric resonator 4 passes through the main path, but at the same time, a part of the electromagnetic energy of the main path is shunted via the coupling probe 6a. Then, this is phase-adjusted to a predetermined phase length by the waveguide shunt 5 provided so as to face the H surface of the outer casing 1, and is re-coupled to the main route by the coupling probe 6b, thereby providing a polar filter. It has the characteristics.

The adjustment of the coupling amount to the waveguide shunt 5 and the adjustment of the coupling amount to the main path are performed on the surface of the outer casing 1 facing the coupling probes 6a and 6b of the waveguide shunt 5. This is performed by bringing the provided polar coupling adjustment members 7a and 7b close to and away from the coupled probes 6a and 6b. Further, the adjustment of the phase length of the waveguide branch 5 is performed by the waveguide branch of the phase adjusting members 8a and 8b provided in the middle of the surface of the outer casing 1 facing the waveguide branch 5. 5 by adjusting the amount of protrusion.

7A and 7B are views showing the structure of the inner housing of the polarized dielectric filter of the second embodiment. FIG. 7A is a front perspective view thereof, and FIG. 7B is a view of FIG. It is a back perspective view seen from the arrow c direction of (A). In the figure, 2 is an inner housing, 3 is a cut-off waveguide, 4 is a dielectric resonator, 4a is a supporting member for the dielectric resonator, and 9 is provided so as to face the E surface of the outer housing 1. Waveguide shunts, 10 are dielectric members, 6a and 6b are coupling probes, 21a and 21b are holes for passing the polar coupling adjusting members 7a and 7b of FIG. 8, and 22a and 22b are also phase adjusting members. Holes for passing 8a, 8b, 23a, 23
Reference numeral b is a cutout portion of the dielectric member for the coupling probes 6a and 6b, 11 is a screw member for adjusting the resonance frequency provided for each dielectric resonator, and 12 is a screw hole thereof.

In the second embodiment, the waveguide shunt 9 is provided in the inner casing 2 so as to face the E surface of the outer casing 1. Therefore, the waveguide shunt 9 is narrow as it is. It becomes a cutoff and cannot be a shunt. Therefore, the dielectric member 10 is inserted to shorten the wavelength passing therethrough, and the dielectric resonator 4
The resonance frequency is used as a waveguide. Further, the coupling probes 6a and 6b are arranged on the substantially center line K of the waveguide shunt 9.
The electromagnetic field induced by the coupling probe 6a is propagated through the waveguide shunt 9 in a distortion-free mode and is coupled to the coupling probe 6b.

FIG. 8 is an assembly diagram of the polarized dielectric filter of the second embodiment. In the figure, 1 is an outer casing of a standard waveguide size, 1a and 1b are their flange faces, and 2 is an outer casing 1. It is the inner housing of FIG. Further 7a, 7b
Is a polarized coupling adjusting member, 8a and 8b are phase adjusting members,
Reference numeral 11 is a screw member provided for each dielectric resonator for adjusting the resonance frequency, and 12 is a screw hole thereof.

The polarized dielectric filter of the second embodiment is completed by inserting and screwing the inner housing 2 in which the dielectric member 10 is loaded into the outer housing 1 of the standard waveguide size. In this state, when an electromagnetic wave arrives in the direction of arrow a, the cutoff waveguide 3 and the dielectric resonator 4 act to cause the main path to have a predetermined bandwidth centered on the resonance frequency of the dielectric resonator 4. Although electromagnetic waves pass through, at the same time, a part of the electromagnetic energy of the main path is shunted via the coupling probe 6a, and the waveguide path 9 filled with the dielectric member 10 adjusts the phase to a predetermined phase length. , And by recoupling to the main path with the coupling probe 6b, a polar filter characteristic is obtained.

The adjustment of the coupling amount to the waveguide shunt 9 and the adjustment to the main route are performed on the surface of the outer casing 1 facing the coupling probes 6a and 6b of the waveguide shunt 9. The polar coupling adjusting members 7a and 7b provided in the vicinity are provided in the holes 21 of the dielectric member 10.
It is carried out by bringing them closer to or farther from the coupled probes 6a, 6b through a, 21b. Further, the adjustment of the phase length of the waveguide shunt 9 is performed by adjusting the phase adjusting member 8a, which is provided in the middle of the outer housing 1 on the center line K of the surface facing the waveguide shunt 9.
8b is taken in and out.

FIG. 9 is a view for explaining the difference in the main parts between the first and second embodiments. FIG. 9A shows the inner casing 2 of the first embodiment.
FIG. 9B is a side view of the inner housing 2 of the second embodiment. In the second embodiment, since the waveguide shunt 9 is provided so as to face the E surface of the outer casing 1, the cut depth w of the cutoff waveguide 3 is made larger than that in the first embodiment. be able to. Therefore, the second embodiment has an advantage that the unloaded Q of the dielectric filter can be made large and the passage loss can be reduced. In addition, the coupling probes 6a and 6b may be arranged in the dielectric resonator 4 depending on the arrangement of the waveguide branch 5 or 9.
Magnetic coupling that intersects the leak magnetic field at a right angle is obtained,
Moreover, the waveguide branch 5 or 9 is provided so that the induced electromagnetic waves propagate in a mode without distortion.

[0039]

As described above, the polarized dielectric filter of the present invention has a structure in which the inner housing 2 is fitted and fixed to the outer housing 1 of the standard waveguide size, and therefore the outer housing 1 Can use a normal standard waveguide, and the inner housing 2 can be made from a small metal block, and thus is easy to manufacture,
Material cost is also low.

The waveguide shunt 5 or 9 in the outer casing 1
Since the polar coupling adjustment members 7a and 7b are provided in the vicinity of the surfaces facing the coupling probes 6a and 6b, the adjustment of the coupling amount for polar does not affect the resonance frequency of the dielectric resonator 4. You can do it. Furthermore, since at least one pair of phase adjusting members 8a and 8b is provided in the middle of the surface of the outer housing 1 facing the waveguide shunt 5 or 9, the phase can be accurately reversed at the pole frequency. Such a phase adjustment can be realized, and the accurate phase adjustment can be performed without replacing the coaxial cables one by one as in the conventional case.

Further, in the polarized dielectric filter of the present invention, since the waveguide branch 9 is provided so as to face the E surface of the outer casing 1, the depth of the cut-off waveguide 3 is cut. w can be increased, which allows the unloaded Q of the dielectric filter.
It is possible to reduce the passage loss.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is a principle configuration diagram of the present invention.

FIG. 3 is a diagram showing a configuration of an inner housing of the polar dielectric filter according to the first embodiment.

FIG. 4 is a cross-sectional view of an essential part showing details of the combined probe unit of the embodiment.

FIG. 5 is a cross-sectional view of essential parts showing details of a phase adjusting unit of the embodiment.

FIG. 6 is an assembly diagram of a polarized dielectric filter of the first embodiment.

FIG. 7 is a diagram showing a configuration of an inner housing of a polarized dielectric filter according to a second embodiment.

FIG. 8 is an assembly diagram of a polarized dielectric filter according to a second embodiment.

FIG. 9 is a diagram for explaining the difference in essential parts between the first and second embodiments.

FIG. 10 is a diagram showing a configuration of a conventional polarized dielectric filter.

FIG. 11 is a cross-sectional view of a main part showing details of a conventional coupled probe unit.

FIG. 12 is a diagram for explaining filter characteristics of a polar dielectric filter.

[Explanation of symbols]

1 Outer case 2 inner housing 3 Cut-off waveguide 4 Dielectric resonator 5 Waveguide branch 6a, 6b binding probe 7a, 7b Polarized coupling adjusting member 8a, 8b Phase adjusting member 9 Waveguide branch 10 Dielectric member 11 screw members 12 screw holes

Claims (6)

[Claims] 1. A standard waveguide size outer casing (1), and an inner casing (2) fitted and fixed to the outer casing (1), wherein the inner casing (2) comprises: Cut-off waveguide (3) provided parallel to the tube axis of the outer casing (1), and cut-off waveguide (3)
The dielectric resonator (4) arranged inside and H of the outer housing (1)
A waveguide shunt (5) provided so as to face the surface, and a coupling probe (6a, 6b) provided between the cutoff waveguide (3) and the waveguide shunt (5). A polarized dielectric filter, comprising: 2. The waveguide shunt (5) of the outer housing (1)
In the vicinity of the surface facing the binding probe (6a, 6b) of
The polarized dielectric filter according to claim 1, further comprising a polarized coupling adjusting member (7a, 7b). 3. The waveguide shunt (5) of the outer housing (1)
2. The polarized dielectric filter according to claim 1, wherein at least one pair of phase adjusting members (8a, 8b) is provided in the middle of the surface facing the. 4. An outer casing (1) having a standard waveguide size and an inner casing (2) fitted and fixed to the outer casing (1), wherein the inner casing (2) comprises: Cut-off waveguide (3) provided parallel to the tube axis of the outer casing (1), and cut-off waveguide (3)
The dielectric resonator (4) arranged inside and E of the outer housing (1)
A waveguide shunt (9) provided so as to face the surface, a dielectric member (10) fitted into the waveguide shunt (9), a cutoff waveguide (3), and a waveguide. A polar dielectric filter, comprising: a coupling probe (6a, 6b) provided between the shunt (9) and the shunt (9). 5. The waveguide shunt (9) of the outer housing (1)
In the vicinity of the surface facing the binding probe (6a, 6b) of
The polarized dielectric filter according to claim 4, further comprising a polarized coupling adjusting member (7a, 7b). 6. The waveguide shunt (9) of the outer housing (1).
The polarized dielectric filter according to claim 4, wherein at least one pair of phase adjusting members (8a, 8b) is provided in the middle of the surface facing the.