JPS63136801A - Band pass filter device for polarized type dielectric resonator - Google Patents

Abstract

PURPOSE:To easily adjust a pole frequency by providing plural dielectric resonators, a metallic enclosure including the dielectric resonators and a jump combination part which can vary the jump combination quantity among the dielectric resonators. CONSTITUTION:Screws 20 and 21 whose edges are taper-shaped are installed on the side wall of the metallic enclosure 5 and they are screwed under probes 18 and 19 in order to push up the probes 18 and 19 by making them abut. Since the screws 20 and 21 contact with the probes 18 and 19 by using their taper surfaces, push-up quantity can be gradually altered with the increase of the radius of a contact part. Thus, since the space between the dielectric resonators 1 and 4 and the probes 18 and 19 for the jump combination can be varied through the screws 20 and 21, the jump combination quantity among the dielectric resonators can be optionally altered in order to easily adjust the pole frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a polarized dielectric resonator band-pass filter device using 2n dielectric resonators (n: an integer of 2 or more).

[Prior Art] Conventionally, this type of polarized dielectric resonator bandpass filter device (
As the DR filter, there is one having the configuration shown in FIG. Note that the DR filter shown in FIG. 3 is a conventional example of a four-stage type.

In FIG. 3, 1 to 4 are dielectric resonators, 5 is a metal casing, and 6 is a cover. On this cover 6, screws 7 to 10 for adjusting the vibration frequency are provided facing the dielectric resonance 'rSi to 4. Reference numerals 11 and 12 denote coaxial connectors for interface with the outside; 13.14 is dielectric resonator 1
．． This is a probe for electromagnetic coupling with 4. Note that the height and width of the metal housing 5 are set so as to cut off radio waves at the frequency used.

In addition, 15.16 is an interlaced coupling probe for obtaining interlaced coupling between dielectric resonators 1.4, and 17 is probe 1.
This is a cable that connects between 5 and 16. Here, the interlaced coupling probes 15 and 16 were fixed at a distance below the dielectric resonator 1.4. Therefore, the amount of interlaced coupling between dielectric resonators cannot be varied.

In the DR filter, only the frequency band that resonates in the TEOIδ mode of the dielectric resonators 1 to 4 provided in the metal casing 5 passes through. Based on the filter theory, the filter characteristics are calculated based on the amount of electrical coupling between the dielectric resonators, the amount of coupling between the dielectric resonators and the input/output circuit QeXL, the electrical jump coupling IJk between the dielectric resonators, and the electrical coupling between the dielectric resonators and the input/output circuit. The phase is determined by each element of the phase. Therefore, the frequency of Po1e (pole) was uniquely determined by the interlaced coupling amount and phase at that time.

[Problems to be solved] In the above conventional polarized dielectric resonator bandpass filter device,
Since the distance between the dielectric resonator and the interlaced coupling probe is fixed, the interlaced coupling amount and phase cannot be changed, and the pole frequency cannot be adjusted.

This invention was made in consideration of the above-mentioned points.
The object of the present invention is to provide a right-pole type dielectric band-pass wave device in which the amount of interlaced coupling between dielectric resonators can be varied and the pole frequency can be easily adjusted.

[Means for solving the problem 1] In order to achieve the above objects, the polarized dielectric resonator band-pass filter device of the present invention includes a plurality of dielectric resonators and a metal casing containing these dielectric resonators. This configuration includes a housing and an interlaced coupling section that can vary the interlaced coupling H11 between the dielectric resonators.

[Example] Hereinafter, explanation 1 will be given with reference to the drawings regarding an example of 11
! Do 1.

Figure 1 shows the polarity according to this embodiment! 2(a) is a front sectional view showing a dielectric resonator bandpass e-wave device (DH filter), FIG.
b) is also a front view. Note that the same parts as in FIG. 3 shown earlier are given the same reference numerals, and detailed explanations of those parts will be omitted.

The DR filter of this embodiment is characterized in that the interlaced coupling portion is configured so that the amount of interlaced coupling between dielectric resonators can be varied. That is, interlaced coupling probe 18.1
As shown in FIG. 2(L), the cable 9 has elasticity that allows it to bend upward using the connection part with the cable 17 as a fulcrum. Then, a screw 20.21 with a tapered tip is provided on the side wall of the metal housing 5, and by screwing this screw 20.21 under the probe 18.19, these screws come into sliding contact and push the probe 18.19. It is now possible to raise it. Here, since the screws 20 and 21 come into contact with the probes ia and 19 with their tapered tips, the amount of push-up can be gradually changed as the contact radius increases.

In this way, the distance between the :A heavy body resonator 1.4 and the interlaced coupling probes 18 and 19 can be varied via the screws 20.21, so the amount of interlaced coupling between the dielectric resonators can be changed arbitrarily. You can easily adjust the pole frequency by

FIG. 4(a) is a characteristic diagram of the DR filter according to the present embodiment, and FIG. 4(b) is a characteristic diagram of the conventional DR filter shown in FIG. 3. As shown in the same figure (b), the conventional D
The pole frequency losses of the R filter were fixed at fl and f2, and could not be changed. On the other hand, in the DR filter of this embodiment, the pole frequency can be changed to fIHflo, f20f2o to bring it closer to or farther away from the center frequency fO, as shown in FIG. 2(a). In order to bring the pole frequency closer to the center frequency fO, the interlace coupling 111 may be made stronger, and conversely, to make it move away from it, it may be made weaker.

In addition, although the embodiment 1 has been described using a four-stage DR filter, the present invention is not limited to this, and may also be applied to a large role type or larger type having a J'+tt body resonator. Of course. Further, as a means for bending the interlaced coupling probe, for example, a structure in which the probe is pressed from below by a screw may be applied instead of the screws 20 and 21. [Effects of the Invention] As explained above. Since the polarized dielectric resonator band-pass filter device of the present invention can vary the interlaced coupling weight between the dielectric resonators, it has the advantage that the pole frequency can be easily adjusted.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing a polarized dielectric resonator band-pass filter device according to an embodiment of the present invention, FIG. 2 (&) is a front view showing an enlarged main part of the device, 2(b) is a top view, FIG. 3 is a front sectional view showing a conventional polarized dielectric resonator bandpass filter device, and FIG. 4(a) is a filter characteristic diagram of the device of the present invention. FIG. 4(b) is a filter characteristic diagram of the conventional device. 1.2, 3, 4:, d Electric resonator 5: Metal housing 6: Cover 7.8, 9, 10: Resonance frequency adjustment screw 11.12:
Coaxial connector 13. 14 Ni probe 17: Cable for interlaced coupling 18. 19: Probe for interlaced coupling 20. 21: Screw

Claims (1)

[Claims] A polarized device characterized by comprising a plurality of dielectric resonators, a metal casing containing these dielectric resonators, and an interlaced coupling portion that can vary the amount of interlaced coupling between the dielectric resonators. type dielectric resonator bandpass filter device.