| 摘要 |
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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