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US 2013/0293318 A1Published application
Bandpass filter of rf communication system
AssigneeElectronics and Telecommunications Research Institute
InventorsJu Yeon HONG, Young Jun CHONG
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Abstract
The present invention relates to the bandpass filter of an RF communication system. The bandpass filter embodies a dual band characteristic by combining an equilibrium zero-order resonator and a non-equilibrium zero-order resonator, provides transmission zero using a cross-coupling structure near a pass band, and also has a neighboring signal blocking characteristic.
Claims9
A bandpass filter of a Radio Frequency (RF) communication system, comprising:
- a first non-equilibrium zero-order resonator and a first equilibrium zero-order resonator connected in series to an input port;
- a second non-equilibrium zero-order resonator and a second equilibrium zero-order resonator connected in series to an output port;
- an induction coupling unit configured to combine the first equilibrium zero-order resonator and the second equilibrium zero-order resonator;
- and
- a cross-coupling unit connected in parallel to and branched from the first equilibrium zero-order resonator and the second equilibrium zero-order resonator.
2 more elements
Dependencies are inferred from the claim text.