SU1177884A1 - Electrical wave low-pass filter - Google Patents

Abstract

1. ELECTRIC LOWER FREQUENCY FILTER containing a first strip-shaped conductor of a spiral shape and a second conductor with a dielectric layer placed between them, characterized in that, in order to reduce dimensions and weight, the second conductor has the same shape and width as the first one. 2. Filter by p. 1, characterized by the fact that the dielectric layer is made in the form of a plate. 3. Filter by p. 1, characterized in that the dielectric layer is made in the form of a hollow cylinder.

Description

Fig. 1 The invention relates to radio engineering and can be used in the manufacture of electronic equipment. The proposed filter has 2-3 times fewer parts, at least 3 times smaller envelopes and mass, it is possible to fully automate the process of its manufacture, since in mass production of printed circuit boards, glass enamels and glass capacitors, their manufacturing processes are currently automated .:; In the proposed filter, full active use of materials and volume is achieved, since there are no auxiliary (non-working) parts and free air volume. The purpose of the invention is to reduce ha of barites and mass. FIG. 1 shows the proposed filter flat design (a - top view, b - side view); in Fig.2, the electrical circuit of the filter (a - for asymmetric, b - for symmetric circuits); Fig. 3 shows a filter made on a tubular insulator. The filter (Fig. 1) has spiral conductors 1 and 2 applied (for example, by spraying) onto a layer of dielectric 3 and pins 4-7 from the beginning and end of each spiral conductor Spiral conductors 1 and 2 are of the same size and opposite each other on opposite sides of the dielectric layer of spiral conductors, for example 1, together with pins 4 and 5, with inductance L, included in the longitudinal branch of the four-port network. ode 1 is a C-Cn capacity, evenly distributed throughout their length in the transverse branch of the quadrupole. Pin 7 is connected to the return conductor of the circuit to be filtered. Pin 6 is not used. When using the filter in a symmetric circuit (Fig. 26), all of its conclusions are used. The proposed filter with two spike conductors forming at the same time inductance and capacitance can also be made on a tubular isolator (Fig. 3). In this case, the spiral strips 1 and 2 are located on the outer and inner surfaces of the dielectric 3. The electrical circuit is similar to that of the flat filter. To increase the inductance inside the tubular dielectric 3, a ferrite rod 8 can be placed. The inductance value of a flat filter can be determined by the formula ... iBXi, .i., 0 ... ggde L - inductance, µH; W is the number of turns; Djj - outer diameter of the helix, cm; 1) - - inner diameter of the helix, cm; k - correction factor k 1-3). The value of the tubular filter is 0.01 Dw L ji, i + 0.44 where D is the diameter of the helix; i is the length of the cylindrical part where the spiral is located. The capacitance for both versions of the filter can be determined by the formula C 0.09 i, where C is the capacitance, pF; h is the width of the conductive helix, cm; spiral length, cm; d is the distance between the spirals, cm; 8 is the dielectric constant of the insulating material. In the manufacture of the proposed filter designs, progressive technologies can be used, used in the manufacture of double-sided printed circuit boards or glass-enamel and glass-ceramic capacitors. In the latter case, the proposed filter will have the same dimensions as a single capacitor.

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Claims (3)

1. ELECTRICAL FILTER OF LOWER FREQUENCIES, comprising a first strip-shaped spiral-shaped conductor and a second conductor with a dielectric layer arranged between them, characterized in that, in order to reduce overall dimensions and mass, the second conductor has the same shape and width as the first. 2. Filter pop. ^. characterized in that the dielectric layer is made in the form of a plate. 3. Filter pop. ^ characterized in that the dielectric layer is made in the form of a hollow cylinder.