Double-throw miniature electromagnetic microwave (MEM) switches
First Claim
1. A miniature double-throw electromagnetic microwave switch comprising;
- a first dielectric substrate having at least one input transmission line, a first output transmission line and a second output transmission line deposited on a front surface of said first dielectric substrate for propagating and routing of microwave signals;
a first cantilever connected to said input transmission line and with projection overlapping at least a part of said first output transmission line;
a second cantilever connected to said second output transmission line and with projection overlapping at least a part of said first cantilever;
a permanent magnetic film deposited on a part of a top surface of said first cantilever for actuating said first cantilever;
a conducting ground layer deposited on a back surface of said dielectric substrate;
a dielectric film coated on part of said conducting ground layer; and
a thin film electromagnetic coil on said dielectric film for actuating said first cantilever, center of said thin film electromagnetic coil substantially coincides with center of said magnetic film.
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Abstract
Miniature double-throw microwave switches are disclosed in this invention. In one embodiment a miniature double-throw electromagnetic switch for microstrip transmission lines is provided. A cantilever, which forms a part of an input transmission line, with a permanent magnetic film can be pulled down or pushed up by an applied magnetic field to make electrical contact with either one of two output transmission lines. The applied magnetic field is generated by applying a positive or negative current to a miniature electromagnetic coil mounted under the cantilevers. In another embodiment, a miniature double-throw microwave switch with two cantilevers attached to the input transmission line is disclosed for microstrip transmission lines. The magnetic polarizations of the permanent magnetic films on the two cantilevers are controlled in such a way that when a magnetic field is applied, one cantilever will be pulled downward to make electrical contact to a first output transmission line. When a reverse magnetic field is applied, the second cantilever will be pulled downward to make electrical contact to a second output transmission line. Yet another embodiment of this invention is a multilayer thin film electromagnetic coil where the magnetic fields induced in all layers of the coils aligned in the same direction to form a strong magnetic field with reduced power consumption.
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Citations
21 Claims
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1. A miniature double-throw electromagnetic microwave switch comprising;
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a first dielectric substrate having at least one input transmission line, a first output transmission line and a second output transmission line deposited on a front surface of said first dielectric substrate for propagating and routing of microwave signals;
a first cantilever connected to said input transmission line and with projection overlapping at least a part of said first output transmission line;
a second cantilever connected to said second output transmission line and with projection overlapping at least a part of said first cantilever;
a permanent magnetic film deposited on a part of a top surface of said first cantilever for actuating said first cantilever;
a conducting ground layer deposited on a back surface of said dielectric substrate;
a dielectric film coated on part of said conducting ground layer; and
a thin film electromagnetic coil on said dielectric film for actuating said first cantilever, center of said thin film electromagnetic coil substantially coincides with center of said magnetic film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A miniature double-throw electromagnetic microwave switch comprising;
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a first dielectric substrate having at least one input transmission line, a first output transmission line, a second output transmission line for propagating and routing of microwave signals;
a first cantilever having a first permanent magnetic film and connected to a first end of said input transmission line and with projection overlapping at least a part of a first output transmission line, magnetic polarization of said first permanent magnetic film being aligned to a first direction;
a second cantilever having a second permanent magnetic film and connected to a second end of said input transmission line and with projection overlapping at least a part of a second output transmission line, magnetization of said second permanent magnetic film being aligned to a second direction;
a conducting ground layer deposited on back surface of said first dielectric substrate;
a dielectric film coated on part of said conducting ground layer; and
a first thin film electromagnetic coil disposed on said dielectric film for actuating said cantilevers, center region of said thin film electromagnetic coil substantially overlaps with centers of said magnetic films. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification