Coupling filter device with specific coupling coefficient

Details Coupling filter device with specific coupling coefficient Coupling filter device with specific coupling coefficient

2007-08-23

2009-10-27

Pascal, Robert (Department: 2817)

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

C333S175000, C333S185000

Reexamination Certificate

active

07609131

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.

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patent: 4980663 (1990-12-01), Moyer
patent: 5805431 (1998-09-01), Joshi et al.
patent: 6476689 (2002-11-01), Uchida et al.

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