Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Reexamination Certificate
2006-03-14
2006-03-14
Ham, Seungsook (Department: 2817)
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
C333S204000
Reexamination Certificate
active
07012484
ABSTRACT:
The present invention discloses a filter using multilayer ceramic technology. The filter comprises an input port, an output port, a first lumped resonator and a first step-impedance resonator connected to the input port, a second lumped resonator and a second step-impedance resonator connected to the output port, a coupling capacitor used for the coupling of the first lumped resonator and the first step-impedance resonator to the second lumped resonator and the second step-impedance resonator. The filter according to the present invention can provide the multi-transmission zeros in the stopband to isolate the adjacent channel and suppress the harmonics, and provide the transmission poles in the passband to have lower insertion loss. In addition, a manufacturing method for the filter using multilayer ceramic technology is also disclosed.
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Article entitled “Harmonic-Suppression LTCC Filter With The Step-Impedance Quarter-Wavelength Open Stub” by Ching-Wen Tang, in IEEE Transactions on Microwave Theory And Techniques, vol. 52, No. 2, Feb. 2004, pp 617-624.
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Chang Sheng-Fuh
Jeng Yng-Huey
Bednarek Michael
Chang Sheng-Fuh
Ham Seungsook
Integrated System Solution Corp.
Pillsbury Winthrop Shaw & Pittman LLP
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