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Multilayered band separator with grounding parasitic capacitor

  • US 6,677,833 B2
  • Filed: 04/17/2002
  • Issued: 01/13/2004
  • Est. Priority Date: 09/21/2001
  • Status: Active Grant
First Claim
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1. A multilayered band separator with grounding parasitic capacitor, capable of separating a high-frequency signal and a low-frequency signal from an operating band with an input signal input by an input port, comprising:

  • a quasi-highpass filter, having three capacitive devices and a grounding inductive device in a cross-shaped implementation to be the high-frequency signal output passage, wherein a capacitive device is a grounding pararistic capacitor formed by the two other capacitive devices;

    a phase shifter, connected in parallel to the quasi-highpass filter, to provide the low-frequency signal output passage; and

    a semi-lumped lowpass filter, connected in series to the phase shifter, to produce a higher outband rejection without an additional filter stage.

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