| 摘要 |
The present invention relates to a multi-layer dielectric bandpass filter ha ving a primary and a secondary passband. A secondary passband outside the reflection zone o f the primary passband is optimized to reduce ripple achieving a passband of at le ast 90% transmission. Optimization comprises modifying the thickness of certain quar ter wavelength reflector layers of a single passband filter from true quarter wa velength at the primary passband to non-quarter, or non-integer-multiple quarter wave thickn ess.
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