Coupling filter device with specific coupling coefficient
AssigneeProsperity Dielectrics Co., Ltd.
InventorsKuo-Hsiung Wang, Wei-Ching Shih
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Abstract
The present invention provides a surface mount design (SMD) coupling filter device with a fixed coupling coefficient having a pair of hollow coils. Theoretically, coupling coefficients of two hollow coils may vary with the parameter such as distance, number of windings, inner radius, wire size, medium coefficient. When a desired coil coupling distance is derived from the above parameters, a pair of hollow coils then is fastened fixed by either a house fastening approach or an adhesive injection fastening approach, such that the desired coil coupling distance can be fixed by using an adhesive with a specific medium coefficient.
Claims20
A coupling filter device with a specific coupling coefficient, comprising:
- a set of two hollow coils spaced by a distance d;
- a fastening mechanism for fastening said two hollow coils and a fixing adhesive (E) having a specific medium coefficient being filled therein, such that a coupling coefficient (DKn) existing between the hollow coils is substantially a constant;
- and
- a contact portion for contacting with solder pads on a circuit board.
Dependencies are inferred from the claim text.