SU218222A1 - ADJUSTABLE DEVICE FOR DELAYING ELECTRICAL SIGNALS - Google Patents

Description

Known delay lines, made in the form of a spiral wound on a rod of a dielectric. The disadvantage of such delay lines is a significant power loss when matching them with the load, which leads to a significant attenuation of the useful signal.

The described adjustable device for delaying electrical signals is devoid of these drawbacks and differs from the known ones in that a dielectric core on which a wire is wound from a spiral delay line is placed parallel to the stem of a spiral delay line and contains metal bands insulated from one another. Together with the screen, the rod forms a coaxial line, the characteristic impedance of which is equal to the characteristic impedance of the spiral delay line.

The screens of both rods are longitudinally interconnected by metal plates forming a strip line, the characteristic impedance of which is also chosen equal to the characteristic impedance of the spiral delay line.

A rewindable wire with a spiral delay line passes through the metal plates of the strip line. The distance between the plates is the same along the entire length of the strip line.

Such an embodiment of the device makes it possible to significantly reduce the power loss of the useful signal when coordinated with the load in a wide frequency range.

The drawing shows the proposed rewinding delay line, consisting of a spiral line 1, a symmetrical strip line 2 and a coaxial line formed by the rod 3 with a wound wire on it

wire and metal screen 4.

The rod 3, on which the wire removed from the delay line is wound, is made of a dielectric covered with short metal strips insulated from each other.

friend The purpose of these strips is to ensure good contact between adjacent turns of a wire wound on a rod. The portion of the dielectric rod 3 to which the wire is rewound becomes metallic and

together with the surrounding screen 4 forms a coaxial cable. The diameter of the outer shield 4 is chosen so that the characteristic impedance of the coaxial cable is equal to the characteristic impedance of the delay line.

The transition from the spiral line to the coaxial line is made in the form of a symmetrical strip line 2. This line is formed by two metal planes and passing between

The distances between the wire planes of the me / to them are the dielectric plates. The lateral dimensions of line 2 are calculated so that its characteristic impedance would be equal to the characteristic impedance of the delay line.

Subject invention

Claims (3)

1. An adjustable device for delaying electrical signals comprising a spiral delay line wound on a dielectric rod placed in a cylindrical screen and a second dielectric rod on which a wire is disposed parallel to the first and placed in a second cylindrical screen, characterized in that in order to reduce the power loss of the useful signal when matched with the load in a wide frequency spectrum, the ordered second rod, on the surface of which are applied longitudinal, is insulated nye from one another by metal strips, forms together with its screen okrul ayuschim coaxial line whose characteristic impedance is equal to the wave sonrotivlennyu helical delay line. 2. A device according to claim 1, characterized in that the cylindrical screens are interconnected but two metal plates in length, said plates being placed one from another at the same distance and forming a symmetrical strip line, the wave response of which is equal to the wave resistance of the spiral line delays. 3. The device of claim 1, characterized in that the wire rewound from the rod of the spiral delay line for a wipe containing metal strips is placed meladu metal plates symmetrical strip line. /