Apparatus for generating a magnetic interface and applications of the same
First Claim
1. A circuit that generates a magnetic interface at a center frequency f0 comprising:
- a substrate having a first surface and a second surface, wherein said first surface is coupled to a ground node; and
an array of spirals deposited on said second surface of said substrate, wherein each spiral has an average track length DAV that is based the center frequency f0 of the magnetic interface.
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Accused Products
Abstract
A magnetic interface generator generates a magnetic interface at a center frequency f0. The magnetic interface generator is a passive array of spirals that are deposited on a substrate surface. The magnetic interface is generated in a plane at a distance Z above the surface of the substrate. The distance Z where the magnetic interface is created is determined by the cell size of the spiral array, where the cell size is based on the spiral arm length and the spacing S between the spirals. The center frequency of the magnetic interface is determined by the average track length DAV of the spirals in the spiral array. In embodiments, the spiral array is one sub-layer in a multi-layer substrate. The spacing S of the spiral array is chosen to project the magnetic interface to another layer in the multi-layer substrate so as to improve performance of a circuit in the plane of the magnetic interface. For example, the magnetic interface can be used to increase the inductance of a printed inductor circuit, and to increase the gain and match of a microstrip patch antenna. Furthermore, the magnetic interface reduces the traverse electric (TE) and transverse magnetic (TM) surface waves in the plane of the magnetic interface, which reduces unwanted coupling between transmission lines.
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Citations
26 Claims
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1. A circuit that generates a magnetic interface at a center frequency f0 comprising:
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a substrate having a first surface and a second surface, wherein said first surface is coupled to a ground node; and
an array of spirals deposited on said second surface of said substrate, wherein each spiral has an average track length DAV that is based the center frequency f0 of the magnetic interface. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device, comprising:
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a substrate layer having a first surface and a second surface, wherein said first surface is coupled to a ground node;
a spiral layer having an array of spirals, printed on said second surface of said substrate, that generates a magnetic interface above said second surface at a center frequency f0; and
wherein said center frequency f0 for the magnetic interface is determined by an average track length DAV for said spirals. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A device, comprising:
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a ground layer;
a first substrate layer having a first surface and a second surface, said first surface coupled to said ground layer;
a spiral layer having an array of spirals that are printed on said second surface of said first substrate layer;
a second substrate layer having a first surface and a second surface, said first surface of said second substrate layer coupled to said spiral layer;
a circuit printed on a second surface of said second substrate layer; and
wherein said spiral layer generates a magnetic interface centered at a frequency f0 in a plane of said circuit, and wherein said center frequency f0 is determined by an average track length DAV of said spirals. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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Specification