JPS6210901A - Band pass filter - Google Patents

Abstract

PURPOSE:To set freely the relation of position of an input/output section by connecting a coaxial waveguide converting waveguide to a coaxial waveguide part by a coaxial connection part so as to constitute a waveguide interface. CONSTITUTION:A coaxial connector 17 for interfacing with an external circuit is connected to one end of a metallic chassis 19, one end of a hollow metallic outer conductor 23 is connected to the bottom face near the right end of the metallic chassis 19 and the waveguide 21 for coaxial waveguide conversion whose one end is opened is connected to the other end while the coaxial center is made in parallel with that of the coaxial waveguide comprising the metallic chassis 19 and a metallic cover 20. Then the waveguide interface is formed by fitting the waveguide for the coaxial waveguide conversion to the coaxial waveguide by the coaxial connection part. Thus, it is possible to select freely the relation of the center position of the coaxial connector 17 and that of the waveguide 21 by changing the length L of the metallic outer conductor 23.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a bandpass filter using a dielectric resonator, and particularly to a bandpass filter in which at least one of the input and output sections is provided with a waveguide interface. Regarding.

(Prior Art) FIG. 2 shows a configuration example of a conventional bandpass filter (hereinafter referred to as DRBPF) using a dielectric resonator having a waveguide interface.

Referring to FIGS. 4(a) and 4(b)'Th, dielectric resonator support stands 6 to 10 are installed at predetermined intervals on the inner wall of a metal chassis 16 which is open at one end and has a waveguide interface formed therein. The dielectric resonators 1 to 5 are mounted on the support stands 6 to 10, respectively. Metal screws 11 to 15 for frequency adjustment are disposed at predetermined intervals on the side surface of the metal chassis 16, penetrating the side wall. On the other hand, a coaxial connector 17 for interface with the outside is connected to the other end of the metal sheet 16, and the coaxial connector 17 and the dielectric resonators 1 to 5 are connected to the coaxial connector 17.
A globe 18 is attached for electromagnetically coupling the two. The coaxial connector 17 and the open end constitute an input/output section.

The rest of the following (problems to be solved by the invention) By the way, in the above-mentioned DR, BPF, the metal chassis 16
Since the input/output sections are substantially completely formed, the positional relationship of the input/output sections becomes constant.

That is, in FIG. 4(b), the positional relationship between the center position A of the coaxial co-octactor 17 and the center position B of the open end of the metal/yarn (coaxial waveguide section) is fixed.
r) If a waveguide circuit is constructed using RBPF', there will be no degree of freedom in the positional relationship of the input and output sections.

On the other hand, in order to have a degree of freedom in the positional relationship of the input and output parts, it is necessary to
Bend waveguide (E-E bend wG, ) It is necessary to take advantage of the clear waveguide circuit and change the positional relationship of the input and output parts. As a result, there is a problem in that the configuration of the DRBPF becomes complicated and the price increases.

(Means for Solving All Problems) The present invention is a band-pass filter that is completely equipped with a coaxial waveguide section in which a dielectric resonator is disposed, and in which at least one of the input and output sections is a waveguide interface. In the above, the waveguide interface is connected to the rotary shaft and the waveguide section by a coaxial joint 8 part.
, is composed of all features and -1; area passing d4j
, is a single wave device.

(Example) The present invention will be explained below with reference to examples.

Figure 1 (a), (+))
This is an example of an actual M1i of R6RPF'.

Referring to FIGS. 1(a) and (b), the upper end is open [1
Furthermore, on the inner bottom of the metal shear 19, dielectric resonator support stands 6 to 1 () are arranged at predetermined intervals.
f5, and the fidget dielectric resonance DI~5 is mounted on the support stands 6~10. A metal plate for frequency adjustment is placed at a predetermined interval in the upper opening of the metal shear/19.
.

It is closed by a metal cover 19 on which metal screws 111 to 15 are disposed, and the metal screws 11 to 15 face the dielectric resonators 6 to Tfl. A coaxial connector 17 for interface with the outside is connected to one end of the metal chassis 190.
A glove 18 is provided for electromagnetically coupling the coaxial connector 17 and the dielectric resonators 1 to 5. Note that a coaxial waveguide section is constituted by the metal beam 19 and the total pressure cover 20.

One end of a hollow metal row conductor 23 is connected to the bottom surface near the right end of the metal chassis 19, and a waveguide (WG) 21 for coaxial waveguide conversion with one end opened is connected to the other end. It is connected to a coaxial waveguide composed of a chassis 19 and a metal cover 20 with their axes parallel to each other. A metallic center conductor 22 is disposed within the metal row conductor 23, one end reaches into the coaxial waveguide, the other end reaches into the waveguide 21, and a probe 24 is disposed at one end of the center conductor 22. has been investigated. The probe 24 establishes an electromagnetic connection between the coaxial waveguide and the waveguide 21. Further, the outer conductor 23 serves as an outer conductor for the center conductor 22. In this way, a waveguide-f interface is formed by attaching a waveguide for coaxial waveguide conversion to a coaxial waveguide section using a coaxial type connection section.

In the case of the bandpass filter shown in FIGS. 1(a) and (b).

The positional relationship between the center position A of the coaxial connector 17 and the center position B of the waveguide 2 can be freely selected by changing the length L of the metal row conductor 23.

Other embodiments according to the present invention are shown in FIGS. 2 and 6. In the bandpass filter shown in FIG. 2, the direction of the open end of the waveguide 21 is opposite to the direction of the open end of the waveguide 21 in the bandpass filter shown in FIG. 1(b).

That is, the open end of the waveguide 21 in FIG. 2 faces leftward. On the other hand, in the bandpass filter shown in FIG. 3, the open end of the waveguide 21 is located at a position obtained by rotating the open end of the waveguide 21 in the bandpass filter shown in FIG. 1(b) by 90 degrees clockwise. It has become.

In this way, the direction of the open end of the waveguide 21 can be arbitrarily set with the axis of the coaxial waveguide and the axis of the waveguide 21 being parallel. Therefore, the positional relationship between the center position A of the coaxial connector 17 and the center position B of the waveguide 21 can be set arbitrarily without using the conventionally required E-E bend WG, Rice) WG, etc. .

(Effects of the Invention) As explained above, according to the DR-BPF' according to the present invention, the positional relationship of the input and output sections can be freely set.

[Brief explanation of the drawing]

Figures 1 (,) and (b) respectively show - of a bandpass filter (DR-BPF) using a dielectric resonator according to the present invention.
FIGS. 2 and 5 are perspective views showing other embodiments of the DR-BPF according to the present invention, and FIGS. DR-
Cross-sectional view and perspective view showing an example of BPF, Figures 5 and 6
Each figure is a perspective view showing a waveguide circuit with a conventional DR-RPF (metal screws not shown) vcE-E bend WGi attached. 1-5...Dielectric resonator, 6-10...Dielectric resonator support stand, 11-15...Metal screw, 16...Metal plate 4--C, 17...Coaxial connector , 18... Zorob, 10... Metal cable, 20... Metal cover, 21... Waveguide (WGL22... Metallic center conductor, 23... Metal outer conductor, 24... Figure 4 (cL) Figure 4 (b)

Claims (1)

[Claims] 1. In a bandpass filter that includes a coaxial waveguide section in which a dielectric resonator is disposed, and at least one of the input and output sections is a waveguide interface, the waveguide interface is connected to the coaxial waveguide. A bandpass filter characterized in that it is constructed by connecting a waveguide for coaxial waveguide conversion to a wave tube section through a coaxial connection section.