Filter using multilayer ceramic technology and structure thereof
First Claim
1. A filter circuit comprising:
- an input port;
an output port;
a first lumped resonator, electrically connected to the input port;
a second lumped resonator, electrically connected to the output port;
a first step-impedance resonator, electrically connected to the input port;
a second step-impedance resonator, electrically connected to the output port; and
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;
wherein the first lumped resonator comprises a first capacitor and a first inductor, and the second lumped resonator comprises a second capacitor and a second inductor.
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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.
21 Citations
20 Claims
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1. A filter circuit comprising:
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an input port; an output port; a first lumped resonator, electrically connected to the input port; a second lumped resonator, electrically connected to the output port; a first step-impedance resonator, electrically connected to the input port; a second step-impedance resonator, electrically connected to the output port; and 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; wherein the first lumped resonator comprises a first capacitor and a first inductor, and the second lumped resonator comprises a second capacitor and a second inductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A filter structure, comprising:
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a top ground plane; an input electrode; an output electrode; a first coupling capacitive layer, positioned below the top ground plane, having a first metal piece, one side of the first metal piece connected to the input electrode; a second coupling capacitance layer, positioned below the first coupling capacitive layer, having a second metal piece, one side of the second metal piece connected to the output electrode; an inductance layer, having a third metal piece and a fourth metal piece, one side of the third metal piece connected to the input electrode to form the lumped inductor and one side of the fourth metal piece connected to the output electrode to form the lumped inductor; a capacitance layer, having a fifth metal piece and a sixth metal piece, one side of the fifth metal piece connected to the third metal piece and formed as the lumped capacitor, and one side of the sixth metal piece connected to the fourth metal piece and formed as the lumped capacitor; a middle ground plane, positioned below the capacitance layer; a step-impedance layer, positioned below the middle layer, having a seventh metal piece and an eighth metal piece, one side of the seventh metal piece connected to the input electrode and one side of the eighth metal piece connected to the output electrode; and a bottom ground plane, positioned below the step-impedance layer. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification