SU1569919A1 - Band-pass filter - Google Patents

Abstract

The invention is used in miniature frequency selective devices. The goal is bandwidth expansion. The band-pass filter contains a dielectric substrate 1, on one side of which one part of the stripline conductors 2 of the resonator 3 located on the multi-conductor line segments and the current-carrying conductors 4 and 5 of the input and output striplines are placed. Another part of the strip conductors 2 is installed on the other side of the dielectric substrate 1 with a gap relative to the grounding base 6. The gap between the conductors 4 and 5 and the strip conductors 2 and the dimensions of the resonator 3 are set, at which the bandwidth drastically increases. 4 il.

Description

one

(21) 4371949 / 24-09

(22) 12/14/87

(46) 07.06.90. Bul 21

(71) Kharkiv State University. A.M.Gorky

(72) S.A. Pogarsky, A.P. Polu nenko, G.M.Petkov, L.NoLitvinenko

And And, I.Saprykin

(53) 621.372.852.1 (088.8)

(56) Mattei D.Ya., Young L., Jones E.M „

Microwave filters, matching circuits and chains

connection. Vol. 1, Holy Day, 1971, p. 356-438.

Aristarkhov G.M., Vershinin Yu.P., Chernyshev V.Pd. Microstrip filter based on a multi-wire system, connected lines with unequal phase velocities, Electronic Engineering. Ser.10, 1983, issue 1, p. 21-26, Fig. 1.

i (54) STRIP AND BAND FILTER (57) The invention is used in miniature frequency selective devices. The goal is to break the bandwidth. The band-pass filter contains a dielectric substrate 1, on one side of which is placed one part of the stripline conductors 2 of the resonator 3, made on segments of the multi-wire line, and the current-carrying conductors 4 and 5 of the input and output striplines. The other part of the strip conductors 2 is installed on the other side of the dielectric substrate 1 with a gap relative to the grounding base 6. The gap between the conductors 4 and 5 and the strip conductors 2 and the dimensions of the resonator 3, at which the passband increases dramatically, is indicated. 4 il.

(L

/ MU / & //////////// // U /

FIES

The invention relates to a microwave technique and can be used in miniature frequency selective devices.

The aim of the invention is to increase bandwidth.

Fig. 1 shows the construction of a skip-through filter with a ring resonator; figure 2 is a view of And figure 1; in fig. 3 shows the design of a band-pass filter with a linear resonator; in fig. 4 is a view of In figure 3.

The band-pass filter contains a dielectric substrate 1, on one side of which one part of the strip conductors 2 of the resonator 3, made on segments of the multi-conductor line, and current-carrying conductors 4.5 4.5 of the input and output strip lines, located symmetrically with respect to the resonator 3 and associated with the extreme strip conductors 2. The grounding base 6 is located on the other side of the dielectric substrate 1 and opposite the strip conductors 2 is installed with a gap in the relative dielectric strength Spoon 1.

Another part of the strip conductors 2 of the resonator 3 is located on the other side of the dielectric substrate 1. The current carrying conductors 4 and 5 are separated from their respective outer conductors 2 by their capacitive gap, which is determined from the ratio

Lh

LA-O Lake . 015 mm

S seff

where YES is the ripple factor of the amplitude-frequency characteristic;

5 sfcr - the average value of the effective dielectric constant of the resonator 3,

Band-pass filter works as follows. i50

When a microwave signal is supplied to the input line formed by dielectric substrate 1 by current-carrying conductor 4 and grounding base 6, a full spectrum of quasi-T wave oscillations is excited in the resonator 3, the number of types of which is equal to the number of strip conductors 2 from types of fluctuations

55

are different, since the rinse / ground conductors 2 are on different sides of the dielectric substrate i. This provides bandwidth expansion. If the resonator 3 is made in the form of a ring, the radius g of the inner side of the inner conductor is equal to

g

..NiW + Sl S.

47 -J

eft

where m is an even number of half-waves laying along the length of the cavity 3;

N is the number of strip conductors 2;

W is the width of the strip conductors 2;

S is the distance between the strip conductors 2. To prevent the sections of the strip conductors 2 from interfering with each other, m 6 is necessary,

If the resonator 3 is made in the form of straight strip strip conductors 2, then their length 1 is determined by

one

jnJAg

2-j s

0

five

50

55

where m 1,2,3 ...

The EALjective dielectric constant фт eff is determined experimentally. The size of the gap Dx influences the pulsations in the passband and is related to them by the ratio given.

When the input and output lines are made with microstrip gap b between the dielectric substrate 1 and the grounding base 6 is realized as a corresponding notch in the grounding base 6 against the strip conductors 2. There is an optimal gap size b which depends on many factors (the slope of the slopes of the amplitude-frequency the characteristics, the number of strip conductors 2, the ripple factor yA) and is determined by mathematical synthesis or experimentally.

Claims (1)

Claims of the invention: A band-pass filter containing a dielectric substrate, on one side of which one part of strip strip conductors is placed 5156 a torus made on a multi-conductor line section, and the current-carrying conductors of the input and output strip lines associated with the extreme strip conductors, and on the other side of the dielectric substrate there is a grounding base, characterized in that the grounding ground against the strip conductors is installed with a gap relative to the dielectric substrate, and another part of the strip conductors of the resonator is placed on the other side of the dielectric substrate, and the current carrying soot conductor dx 9 consequently, the input and output strip lines are connected to the extreme transverse conductor through a capacitive gap, the value of which AH is determined from the ratio l№Р -0.0.5. MM, -J eff L A is the ripple factor of the amplitude-frequency characteristic; the average value of the effective dielectric constant of the resonator. I am Vida FIG. 2 one B S ///// 7S //////////////////////////////////////// Fig.Z didb