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US 6,320,491 B1Granted
Balanced inductor
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsSpartak Gevorgian, Bertil Hansson
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Abstract
A balanced inductor formed on lossy substrate material having adjacent strips leading current in opposite directions and being arranged in such a way that substrate currents relating to individual strips (1) induced in the lossy substrate (3) are balancing out one another leading to high Q-values. The inductor structure according to the invention can be implemented in MMIC devices using standard semiconductor substrates and do not require any special treatment of the substrate being needed.
Claims14
An inductor comprising:
- a lossy substrate;
- conductive strips disposed on said lossy substrate;
- at least two terminals connected to the conductive strips wherein a distance between the terminals is less than a wavelength corresponding to the operational frequency of the inductor;
- wherein the conductive strips are positioned to form a first loop and are arranged for carrying currents in opposite directions and further arranged so that no two adjacent strips carry current in the same direction, thereby enabling currents induced in the lossy substrate to balance each other;
- wherein said distance is less than λ/(10{square root over (Eω+L )}), where E is an effective dielectric constant of the substrate and λ is the wavelength intended for the inductor.
2 more elements
Dependencies are inferred from the claim text.