Magnetically tuned resonant circuit

In combination:

• a first plurality of relatively narrow spaced conductors, said first plurality of spaced conductors being connected between a first pair of relatively wide strip conductors, a first one of the first pair of conductors being fed by an input signal, with said input signal being distributed to the first plurality of spaced conductors;
• a second plurality of relatively narrow spaced conductors, said second plurality of spaced conductors being connected between a second pair of relatively wide strip conductors, said second plurality of spaced conductors being spaced from said first plurality of spaced conductors;
• means, including a gyromagnetic resonant body disposed between the first and second pluralities of spaced conductors, for coupling between said first and second pluralities of spaced conductors a signal having a predetermined resonant frequency, in response to the input radio frequency signal distributed to the first plurality of spaced conductors, with the coupled resonant frequency signal being distributively fed from the second plurality of spaced conductors to a first one of the second pair of relatively wide conductors;
• and
• wherein each plurality of spaced conductors is arranged to distribute said signals fed to said first and second pluralities of spaced conductors to provide in response to such distributed signals, a uniform magnetic field distribution through the resonant body.

In combination:

• a first dielectric;
• a first pair of spaced relatively narrow strip conductors disposed on the dielectric having first ends thereof connected to a first relatively wide strip conductor and second ends thereof connected to a second relatively wide strip conductor, the end of said second strip conductor being terminated in an open circuit;
• a second dielectric;
• a second pair of spaced relatively narrow strip conductors disposed on the second dielectric having first ends thereof connected to a third relatively wide strip conductor and second ends thereof connected to a fourth relatively wide strip conductor, the end of said fourth strip conductor being terminated in an open circuit, said second pair of spaced strip conductors being spaced from such first pair of spaced strip conductors;
• and
• a ferrimagnetic resonant body disposed for coupling energy fed to an input one of such pair of spaced conductors to an output one of such pair of spaced conductors.

A filter comprising:

• an input coupling circuit, such input coupling circuit including a first strip conductor having a first bifurcated portion providing a first pair of relatively narrow, outwardly bowed, spaced strip conductors disposed between the end portions of the first strip conductor;
• an output coupling circuit, said output coupling circuit including a second strip conductor having a bifurcated portion providing a second pair of relatively narrow, outwardly bowed, spaced strip conductors disposed between the end portions of the second strip conductor, said output coupling circuit being spaced from said input coupling circuit;
• a gyromagnetic resonant body disposed between such coupling circuits;
• and
• wherein such coupling circuits provide in response to a radio frequency signal fed to the input coupling circuit a uniform radio frequency magnetic field distribution through the resonant body to couple resonant frequency energy from the input coupling circuit, to the output coupling circuit, through the resonant body.

In combination:

• a first plurality of spaced conductors having a single input conductor;
• a second plurality of spaced conductors spaced from said first plurality of spaced conductors and orthogonally aligned with respect to the first plurality of spaced conductors;
• wherein each of said pluralities of spaced conductors is arranged to provide a uniform magnetic field distribution in a region common to the plurality of spaced conductors in response to a signal fed to said first plurality of spaced conductors;
• and
• means, including a resonant body disposed in the region of uniform magnetic field distribution, for coupling energy between a first one of such plurality of spaced conductors and a second one of said plurality of spaced conductors, the frequency of said coupled energy being substantially given by .omega..sub.o =.gamma.H.sub.DC.

In combination:

• a first strip conductor having a first bifurcated portion disposed on a dielectric;
• a second strip conductor having a second bifurcated portion disposed on a second dielectric and spaced from such first strip conductor;
• a gyromagnetic resonant body disposed between said first and second bifurcated portions;
• and
• wherein such bifurcated portions are arranged to provide a uniform magnetic field distribution through said resonant body in response to a radio frequency signal fed to one of such strip conductors.

In combination:

• a pair of microstrip transmission lines, including a pair of dielectrics, a common ground plane conductor disposed between first surfaces of said dielectrics and a pair of bifurcated strip conductors, each one disposed on a corresponding one of second surfaces of said pair of dielectrics, said ground plane conductor having a void and said pair of dielectrics having an aperture through such dielectrics aligned with the void in the ground plane conductor;
• a gyromagnetic resonant body disposed in such aperture symmetrically with respect to said void in the ground plane cnnductor such that the magnetic field generated in the resonant body is substantially parallel to the ground plane;
• and
• wherein the size of such void is selected to reduce coupling of electromagnetic energy between said resonant body and ground plane.

A method of reducing spurious energy transfer in a magnetically tuned resonant circuit comprising the steps of:

• providing a pair of coupling circuits, each one having a plurality of selectively spaced conductors;
• providing a ferrimagnetic resonant body disposed between said coupling circuits;
• providing a common signal to a first one of said coupling circuits;
• and
• distributing said signal to each of such spaced conductors of said first coupling circuit to provide a uniform magnetic field distribution through the resonant body.

A dual-stage magnetically tuned resonant circuit comprising:

• (a) an input, output radio frequency transmission line stage comprising:
• (i) first means for providing a dielectric support;
• (ii) an input strip conductor having a pair of spaced strip conductor portions disposed on a first surface of the first support means;
• (iii) an output strip conductor having a pair of spaced strip conductor portions disposed on the first surface of the first support means, and dielectrically spaced from the input strip conductor;
• (b) an interstage transmission line comprising:
• (i) a second means for providing dielectric support;
• (ii) an interstage strip conductor having first and second pairs of spaced strip conductor portions disposed on a first surface of the second support means;
• (c) a ground plane conductor having a pair of voids and disposed between second surfaces of said first and second support means;
• (d) means, for coupling resonant frequency energy from the input line to the interstage line and then to the output line, including a pair of gyromagnetic bodies disposed between the pairs of spaced strip conductor portions of the input and output strip conductors and a corresponding one of first and second pairs of spaced strip conductor portions of the interstage strip conductor, and bodies being further disposed through said voids in the ground plane;
• and
• (e) wherein radio frequency energy provided in the region of said spaced strip conductor portions provides uniform magnetic field distribution through the gyromagnetic bodies.