High-frequency ferrimagnetic delay device

Claim 2

A high-frequency signal delay device comprising: casing means, high-freqency input means lying partly within said casing means, high-frequency output means lying partly within said casing means, said casing means providing means for reducing direct undelayed coupling between said high-frequency input and output means, ferrimagnetic delay means coupling said high-frequency input and output means in energy exchanging relation, said ferrimagnetic delay means including a magnetic field responsive yttrium iron garnet portion having first and second parallel end surfaces, and yttrium aluminum garnet quarter-wave plate means bonded to at least one of said first and second parallel end surfaces, said yttrium aluminum garnet quarter-wave plate means being cut in such a manner that the angle between the velocity vector of the fast shear wave within said quarter wave plate and the <100> crystallographic axis of said garnet lies between substantially 2* and substantially 22.5*.

Claim 3

A high-frequency signal delay device comprising: casing means, high-frequency input means lying partly within said casing means, high-frequency output means lying partly within said casing means, said casing means providing means for reducing direct undelayed coupling between said high-frequency input and output means, ferrimagnetic delay means coupling said high-frequency input and output means in energy-exchanging relation, said ferrimagnetic delay means including a magnetic field responsive yttrium iron garnet portion having first and second parallel end surfaces, and yttrium gallium garnet quarter-wave plate means bonded to at least one of said first and second parallel end surfaces, said yttrium gallium garnet quarter-wave wave plate means being cut in such a manner that the angle between the velocity vector of the fast shear wave within said quarter-wave plate and the <100> crystallographic axis of said garnet lies between substantially 1* and substantially 22.5*.

Claim 4

A high-frequency signal delay device comprising: casing means, high-frequency input means lying partly within said casing means, high-frequency output means lying partly within said casing means, said casing means providing means for reducing direct undelayed coupling between said high-frequency input and output means, ferrimagnetic delay means coupling said high-frequency input and output means in energy-exchanging relation, said ferrimagnetic delay means including a magnetic field responsive yttrium iron garnet portion having first and second parallel end surfaces, and yttrium gallium garnet quarter-wave plate means bonded to at least one of said first and second parallel end surfaces, said yttrium gallium garnet quarter-wave wave plate means being cut in such a manner that the angle between the velocity vector of the fast shear wave within said quarter-wave plate and the <100> crystallographic axis of said garnet lies between substantially 1* and substantially 22.5*.

Claim 5

A high-frequency signal delay device comprising: casing means, high-frequency input means lying partly within said casing means, high-frequency output means lying partly within said casing means, ferrimagnetic delay means coupling said high-frequency input and output means in energy-exchanging relation, said ferrimagnetic delay means including a magnetic field responsive yttrium iron garnet portion having first and second parallel end surfaces, and quarter-wave plate means comprising a dielectric material having a cubic lattice bonded to at least one of said first and second parallel end surfaces, said quarter-wave plate means being cut in such a manner that the angle theta between the velocity vector therein of the fast shear wave and a <100> crystallographic axis of the dielectric material and the thickness t of the said quarter-wave platE are related by the equation: t Vf/f A sin2 2 theta where: Vf is the velocity of the fast shear wave in the dielectric material, f is the carrier frequency of the signal to be delayed, and A is a constant representing the complex elastic properties of the dielectric material, and the angle theta is greater than or equal to 1* and less than or equal to 22.5*.

Claim 6

A high-frequency signal delay device comprising: casing means, high-frequency input means lying partly within said casing means, high-frequency output means lying partly within said casing means, ferrimagnetic delay means coupling said high-frequency input and output means in energy-exchanging relation, said ferrimagnetic delay means including a magnetic field responsive yttrium iron garnet portion having first and second parallel end surfaces, and quarter-wave plate means comprising a dielectric material having a cubic lattice bonded to at least one of said first and second parallel end surfaces, said quarter-wave plate means being cut in such a manner that the angle theta between the velocity vector therein of the fast shear wave and a <100> crystallographic axis of the dielectric material and the thickness t of the said quarter-wave platE are related by the equation: t Vf/f A sin2 2 theta where: Vf is the velocity of the fast shear wave in the dielectric material, f is the carrier frequency of the signal to be delayed, and A is a constant representing the complex elastic properties of the dielectric material, and the angle theta is greater than or equal to 1* and less than or equal to 22.5*.

Claim 7

A high-frequency signal delay device comprising: high-frequency input means, high-frequency output means, ferrimagnetic delay means coupling said high-frequency input and output means in energy-exchanging relation, said ferrimagnetic delay means including a magnetic field responsive portion having first and second end surfaces, quarter-wave plate means composed of a crystalline cubic lattice material having substantially the same thermal coefficient of expansion as that of said magnetic field responsive portion of said ferrimagnetic delay means bonded to at least one of said end surfaces, said quarter-wave plate means being cut in such a manner that the angle between the velocity vector of the fast shear wave in said quarter wave plate and the <100> crystallographic axis of said cubic lattice material is equal to or greater than 1* and equal to or less than 22.5*.

Claim 8

A high-frequency signal delay device comprising: high-frequency input means, high-frequency output means, ferrimagnetic delay means coupling said high-frequency input and output means in energy-exchanging relation, said ferrimagnetic delay means including a magnetic field responsive portion having first and second end surfaces, quarter-wave plate means composed of a crystalline cubic lattice material having substantially the same thermal coefficient of expansion as that of said magnetic field responsive portion of said ferrimagnetic delay means bonded to at least one of said end surfaces, said quarter-wave plate means being cut in such a manner that the angle between the velocity vector of the fast shear wave in said quarter wave plate and the <100> crystallographic axis of said cubic lattice material is equal to or greater than 1* and equal to or less than 22.5*.

Claim 9

Apparatus as described in claim 4 wherein said quarter-wave plate means is comprised of a material selected from the class of dielectric garnet materials including yttrium aluminum garnet and yttrium gallium garnet.

Claim 10

Apparatus as described in claim 5 wherein said magnetic field responsive portion comprises yttrium iron garnet.

Claim 11

Apparatus as described in claim 6 comprising magnetic field generation means for generating a predetermined magnetic field within said magnetic field responsive portion.