JPS5942726Y2 - Distributed constant filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a distributed constant filter having a resonator loaded with a dielectric material.

1. Short-circuit one end and open the other end. A line with a length of λ/4 (λ: wavelength) operates with a resonator and j-1. , Tonoyo 57ff
A distributed constant filter in which a plurality of i-resonators are arranged in parallel and the resonators are coupled by appropriate means is compact and is known as a comb filter.

Such distributed constant type filters are widely used especially in the microwave band.

Furthermore, for the purpose of miniaturization, the line is loaded with a dielectric material with a high relative permittivity, and a capacitor for adjusting the center frequency is provided at the open end of the line, thereby making the distributed constant filter more compact and improving its characteristics. Proposed by the applicant.

FIGS. 1 and 2 show the basic configuration of this type of distributed constant filter.

In these figures, a plurality of resonators 4 loaded with a dielectric material 3 are arranged in series in a box-shaped conductor case 1 around a line 2 whose open end is formed into a disk shape. Coaxial connectors 5.6 for input and output are provided on both end faces of the connector.

On the other hand, the upper surface part 10 of the box-shaped conductor case 1 has the line 2
A plurality of disc-shaped capacitor electrodes 11 are arranged facing the open end of the capacitor electrode 11 .

By the way, in the above-mentioned distributed constant type filter, the resonators 4 are arranged linearly in one row, so a multi-stage distributed constant type filter with a large number of resonators 4 has the disadvantage that the total length is extremely long and the installation area is large. occurs.

In view of the above points, the present invention aims to reduce the overall length by arranging the resonators in a zigzag pattern to provide a distributed constant filter having a shape suitable for mounting.

Embodiments of the distributed constant filter according to the present invention will be described below with reference to the drawings.

In FIGS. 3 and 4, resonators 4A to 4G loaded with dielectric material are arranged in a zigzag pattern around a line 2 whose open end is formed into a disk shape in a single box-shaped conductor case. ,
There are coaxial connectors 5 for input and output on both end faces of the box-shaped conductor case 1A.
．． 6 is provided.

Furthermore, shield plates 20 are provided in the box-shaped conductor case 1A between the resonators 4A and 4C, between the resonators 4B and 4D, between the resonators 4C14E, between the resonators 4D and 4F, and between the resonators 4E and 4G.

On the other hand, on the top surface 10A of the box-shaped conductor case 1A, there are disc-shaped capacitive electrodes 11A to 1 facing the open end of the line 2.
1G are similarly arranged in a zigzag pattern.

In addition, loops 21 and 22 made of L-shaped conductors are connected to the core wire of the coaxial plug 5.6, respectively, to form resonators 4A and 4G.
The other ends of the loops 21 and 22 are connected to one box-shaped conductor case.

In the configuration of the above embodiment, the microwave signal applied from the coaxial plug 5 propagates in the order of the resonators 4A, 4B, 4C14D, 4E4F, and 4G due to the presence of the shield plate 20. It is possible to achieve the same effect as when a resonator is placed in the resonator.

Furthermore, by arranging the resonators 4A to 4G in a zigzag pattern, the longitudinal dimension of the box-shaped conductor case 1A can be significantly shortened, so even when configuring a multi-stage distributed constant filter, the external dimensions can be reduced. It can be set in a shape suitable for mounting, and the installation area can also be reduced.

As described above, according to the present invention, the total length can be shortened by arranging a plurality of resonators in a zigzag pattern, and a distributed constant filter having a shape suitable for mounting can be obtained.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view showing a basic distributed constant type filter.
Figure 2 is a plan view with the top part of the box-shaped conductor case removed, and Figure 3 is a plan view of an embodiment of the distributed constant filter according to the present invention, with the top part of the box-shaped conductor case removed. 4 are bottom views of the top surface of the box-shaped conductor case viewed from below. 1.1A...Box-shaped conductor case, 2...
Line, 3...Dielectric, 4.4A to 4G...
...Resonator, 10.10A...Top part, 11
．． 11A to 11G...capacitance electrode, 20...
...shield plate.

Claims (1)

[Scope of utility model registration request] In a distributed constant filter having a plurality of resonators in which a line is short-circuited at one end and open at the other end, a dielectric material is loaded, and a capacitance is provided at the open end of the line, the plurality of resonators are arranged in a zigzag pattern. A distributed constant filter characterized in that a shielding member is provided so that radio waves propagate in a zigzag pattern.