JPS587901A - Waveguide type high-pass filter - Google Patents

Abstract

PURPOSE:To obtain a high-pass filter with simple constitution and small dimensions which does not reflect low frequency by providing high-pass wave-guides to be of interrupting areas for low frequency so as to be separated to each other by 1/4 wavelength or its odd times. CONSTITUTION:High and low frequency components inputted from an input terminal 1 are divided by waveguides 11a, 11b at the same phase and the same amplitude and led into high-pass waveguides 12a, 12b respectively. Since the dimension 9 of a section (H face) of the waveguides 12a, 12b is selected so that the waveguides 12a, 12b are of interrupting areas for low frequency and the waveguides 12a, 12b are arranged so that a position from a resistor board 14 is shifted by the length 8 of 1/4 wavelength of the waveguides or its odd times, the low frequency reflected by the waveguides 12a, 12b reaches a resistor board 14 fitted between the waveguides 11a, 11b with different phases by 180 deg. to each other at the same amplitude and current is generated along the resistor board 14. Namely, the low frequency is absorbed into the resistor board 14 and is not returned to the input terminal 1. Thus, a high-pass filter with simple constitution and small dimentions is obtained without reflecting low frequency.

Description

[Detailed Description of the Invention] This invention relates to a multi-pass filter using a four-wave tube, and more specifically, reflection of the low frequency, which is the cutoff region, occurs on the input side. Make sure there is no fc
A complete high-pass filter is proposed.

There is a conventional ridge filter and one shown in FIG. In the figure, (1) bottom input end, +211'rmagic'r'+t8al and (ab) U square 4[
A mounted passing guide tube using the low-frequency cutoff characteristics of the tube, magic 'l' in (4), 151 is the output 'AM, I['il and (71 is a non-reflection terminator. 2 is an equivalent circuit configuration diagram of FIG. 1. Next, the operation will be explained. Input @(
The installation and low frequency input from 1) are set using Magic T (
2), by dividing the two parts with the same phase and the same width, -1 knee 1
``L.

The cross section (H) dimension (9) of the Akane area passage conduit (8al and (3b)) is selected to be a cutoff area at a low frequency, and furthermore, The position of the 4θ fang tube (3a) and (3b) from the magic T (2) is 1
At a low frequency, however, λ11: At a low frequency, the internal wavelength N: 0 Also, since they are arranged with an arbitrary positive integer dimension (8) shifted, the flat pass guide V (8a) and (3b) The nfC low frequency wave reflected at the magic T +21 arrives at 180 degrees out of phase, so the two are combined and connected to an anti-reflection terminator 1 (il
Since V is absorbed, the input terminal does not exceed 7'L. On the other hand, high frequency eJ, high frequency pass specialist'
k (8a) and (3b) ke trace, magic T in the same phase
(4) is reached, and the output terminal is +51 VC. In this case, the City Area Traction Police Officer (8a) and (31))
Even if the position of is IIJ Zuno [with dimension (8)], if the passage length between Magic T +21 and (4) is the same, 7'L,
What is the loss of V for that frequency? without arising,
Almost everything rr supplied to the input terminal (1) is supplied to the output terminal (
5) Go to.

The conventional 04-shape tube-shaped high-pass filter is configured to have a low frequency range of 17), no reflection, and more than σ], so the configuration size is large and the filter is fully effective within the space inside the satellite. In order to use it, the drawback is that it cannot be used. :J
Ta.

This invention aims to solve all these drawbacks.
The present invention provides a mounted pass filter with a small structural size and no reflection of low frequencies.

Hereinafter, one embodiment of the present invention shown in FIG.
, -1 square g4 het (rt & cross section (E side) dimension ke 2 minutes i
! i'l I-fC2j4-W? Ml', (■2a) and (121]
) Dividing the dimension into two, 17-417 he1't's i1 (commercial area pass-through using the area-blocking property), (18al and (13blge2H temporary blue (11,1) and (1, l b
l and l? rijiIPj'llF, Q41'1q
141&'tG7 tlla) and (101) -F<(l and ffru 4jk plate, fl!ilge monument?
This is a metal plate that serves as a partition between anti'fJ (Ila), (12al, (18a) and (111]), and (121)l (181).The operation will be explained next.Input end (1) [Input] fC, commercial range and low frequency range are divided into two with the same phase and amplitude to the special wave tubes Bla) and +l1l)l, and each is a supersonic wave mounted in a 7L tube '@112a) and(
t2b). Horizontal H-sir surface of a special wave tube passing through the city area (H)
Dimension +9111: f, VC is selected so that the low frequency becomes the cutoff region, and the island area passing wave tube (12al and l 1.21J l) ), the dimension (8) has been shifted and rearranged!
) and (121)) are reflected by the low frequency wave tube (l
resistance plate a between lal and (llb) with the same amplitude.
It arrives with an 80 degree difference l6 phase, and as shown in Figure 4, the resistance &
(Since a current is generated in 14, it will be absorbed by this pipe, and the IL will not be drawn up to the input terminal (1).)
The state near the resistance plate A41 of the reflected wave from & (141 (4J, by the way, current 121a)
(211)l, and the resistor plate absorbs 0 V.

At first, high-pass conduit (12a) and (12
bl 'e A D , six (18a
) and (131) I VC arrives and is combined into 1 and output terminal +
51 K goes to 0 (/J 4-wave, high-pass 24-wave) Even if the positions of the 24-wave tubes (12a) and (12b) are as large as the dimension (8), the 4-wave tube (llal and (18a)) Listen and (fi
If the passage length between b) and (18b) is the same, then
Almost all of the voltage supplied to the input terminal (1) is +51V at the output terminal, without any sound loss occurring at high frequencies.
C appears.

Therefore, according to the present invention, it is possible to realize a mounted pass filter that is simple in construction, small in size, and free from reflection of low frequencies.

By the way, I have written about vC when entering from IJ1 manual power +11, but when entering from the output end (51), V core waveguide (part of the partition wall between 18al and (181)l) If the resistor is made of gold film, the same ↓ effect can be obtained. As the lower frequency is explained as 1 or more, there is a - rectangular frequency V, which is described (7).

Even if the frequency band is at a certain interval, if the high-pass m-wave tube is in the cutoff region at the highest frequency in the frequency band, and the first equation is approximately satisfied, then 7L is the same. The effect is as follows.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the conventional mounting path filter, Fig. 2 shows the configuration of the circuit r4 of Fig. 1, and Fig. 8 shows an embodiment of the present invention. figure. FIG. 4 is a diagram illustrating the entire state near the resistance root in FIG. 3; In the figure, (1) is the input terminal, +21. Magic T to +41, (8a), (8bl, 112al, (
Passing through 12111DEN area 4th grade 'f1. +++B output 4
, Ifil, (71Far non-reflection terminator, ()
, lal, (Ill)l, (18J, (18b)
[[47f affirmative, aair resistance tentative. 051 metal plate. In addition, in the figure, the same or corresponding parts vc tcr are marked with the same numerals (indicated by 7).

Claims (1)

[Claims] The rectangular 4-wave tube iE is divided into two in the plane direction, a metal root is inserted in the partition wall between them, and the IJ plane dimension is narrowed in the middle of the above-mentioned two-divided nfC conductor tube, thereby creating a cutoff region for low frequencies. Naru high pass 4-way tube? They are spaced apart from each other by a quarter of the inner wavelength of the two-split waveguide, or an odd number multiple of that wavelength,
4V tubular high-pass filter, f
Luta.