SU1608759A1 - Rejector filter - Google Patents

Abstract

This invention relates to a microwave technique. The goal is to expand the band of the notch filter. The notch filter is microstrip and contains a dielectric substrate 1, on which the strip conductor 3 and half-wave conductors 6, 7 and 8 are electromagnetically coupled to it and located symmetrically with respect to the A-A lines perpendicular to it. The coupling coefficient between the ends of each half-wave conductor 6, 7 and 8 and the strip conductor 3 is less than the coupling ratio with the middle part 9. Due to this, the ratio of the electrical lengths on even and odd waves increases and the barrier line increases. 3 il.

Description

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INF 46734 / 24-09, 06.88

.11.90. Bul № 43 Moscow electrotechnical communication

M. Aristarkhov, P. S. Mikhnevich Chernyshev 1.372.852.1 (088.8)

Feldstein, AL, Yavich, L. R. Smir-P. Soviet Radio, 1967, p. 567, 18.

Contents US No. 4578656, I P 1/203, 1986.

(54) REGIONAL FILTER (57) The invention relates to a microwave technique. The goal is to expand the band of the notch filter. The notch filter is microstrip and contains a dielectric substrate 1 on which the strip conductor 3 and half-wave conductors 6-8 are located, electromagnetically associated with it and located symmetrically, relate to the AA lines perpendicular to it. The coupling coefficient between the ends of each half-wave conductor 6-8 and the strip conductor 3 is less than the coupling ratio with it of the middle part 9. Due to this, the ratio of the electrical lengths of even and odd waves.m increases and the obstacle band expands. 3 il.

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The invention relates to microwave technology and can be used in frequency-selective circuits of the microwave path.

The aim of the invention is to expand the barrier line.

FIG. Figure 1 shows the design of the rejector filter; in fig. 2 - the same, the second embodiment; in fig. 3 is the same as the third embodiment.

The notch filter contains a dielectric substrate 1, on one side of which a metallization layer 2 is placed, and on the other side is a strip conductor 3, the ends 4 and 5 of which are the input and output, respectively. Half-wave conductors 6-8 are open at the ends and are electromagnetically connected to the strip conductor 3. Each of the half-wavelength conductors b (7 and 8) is located symmetrically with respect to the AA line, perpendicular to the strip-like conductor 3. The coupling coefficient between each of the ends of the half-wavelength conductor 6 ( 7 and 8) and the strip conductor 3 is less than the coupling coefficient between the middle part 9 of the half-wave conductor 6 (7 and 8) and the strip conductor 3.

The distance between the nearest ends of the electromagnetic coupling regions of the adjacent half-wave conductors 6, 7 and 7, 8 is equal to a quarter for the wavelength.

The notch filter works in the following way.

The microwave signal arrives at the end 4 of the strip conductor 3 and is removed from the end 5.

The attenuation band lies in the frequency range where the electrical length of the half-wave conductor 6 (7 and 8) is less than the half-wave in the even type of excitation and more than the half-wave in the odd type of excitation. Thus, the barrier band is completely determined by the difference in electrical lengths associated with the half-wave and strip conductors 6 (7 and 8) and 3 for even and odd types of excitation. In the case of homogeneous lines containing half-wave and strip conductors 6 (7 and 8) and 3, this condition is equivalent to the difference in phase velocities for even and odd types of excitation.

With increasing inequality of the electrical lengths of the connected half-wave and strip conductors 6 (7.8) and 3, the barrier band expands. This occurs as long as / in, where 00 is the electrical length of the associated

half-wave and strip conductors b (7.8) and 3, respectively, on even and odd waves, after which parasitic bandwidths begin to form. The increase in / „/ oo is realized by reducing the coupling coefficient of the ends of the half-wave

conductors b (7 and 8) with strip conductor 3 as compared with the coupling coefficient in the middle part 9 half-wave conductors 6 (7 and 8). For this purpose, a change in the distance between

strip and parts of half-wave conductors 3 and b (7 and 8) (fig. 1), changing their width (fig. 2) or making half-wave conductors b (7 and 8) are U-shaped (fig. 3). Perhaps the use of these funds at the same time.

Similar obstacle bands are formed at all frequencies that are multiples of the main obstacle band. .

Quarter-wave connecting lengths of long / strip conductor 3

perform the role of inverter resistances.

Claims (1)

Invention Formula Notch filter containing dielectric substrate on one side which has a metallization layer, and on the other a strip conductor, the ends of which are the input and output, respectively, half-wave conductors open at the ends and electromagnetically connected to the strip conductor, and the distance between the nearest ends of the electromagnetic coupling regions of the adjacent half-wave conductors is a quarter wavelength, characterized in that, in order to broaden the barrier band, each of the half-wave conductors is located symmetrically with respect to a line perpendicular to the strips and the coupling coefficient between each of the ends of the half-wave conductor and the strip conductor is less than the coupling ratio between the middle part of the half-wave conductor and the strip conductor. Rig. z rig. at