摘要:
A filter chip lying on an upper surface of a top layer package substrate is connected to an upper surface ground electrode (235). The upper ground electrode (235) and a lower surface ground electrode (237) are connected to each other via through electrodes (261, 262, 263), ground wiring patterns (251, 252), first connecting lines (271 to 276), and second connecting lines (281, 282). The first connecting lines (271 to 276) are connected to the ground wiring patterns (251, 252), whereas the second connecting lines (281, 282) are not connected to the ground wiring patterns (251, 252), respectively. Owing to the provision of the connecting lines connected to the ground wiring patterns (251, 252) and the connecting lines unconnected to the ground wiring patterns (251, 252), the impedance between a multilayer package substrate and ground can be adjusted.
摘要:
A filter chip lying on an upper surface of a top layer package substrate is connected to an upper surface ground electrode (235). The upper ground electrode (235) and a lower surface ground electrode (237) are connected to each other via through electrodes (261, 262, 263), ground wiring patterns (251, 252), first connecting lines (271 to 276), and second connecting lines (281, 282). The first connecting lines (271 to 276) are connected to the ground wiring patterns (251, 252), whereas the second connecting lines (281, 282) are not connected to the ground wiring patterns (251, 252), respectively. Owing to the provision of the connecting lines connected to the ground wiring patterns (251, 252) and the connecting lines unconnected to the ground wiring patterns (251, 252), the impedance between a multilayer package substrate and ground can be adjusted.
摘要:
A branching filter package has a SAW filter chip housing area which houses a piezo electric base, on which a transmitting SAW filter and a receiving SAW filter having a different frequency passing band with each other, are formed, and an impedance matching circuit and a branching circuit for the transmitting SAW filter and the receiving SAW filter.
摘要:
A branching filter package has a SAW filter chip housing area which houses a piezo electric base, on which a transmitting SAW filter and a receiving SAW filter having a different frequency passing band with each other, are formed, and an impedance matching circuit and a branching circuit for the transmitting SAW filter and the receiving SAW filter.
摘要:
A branching filter comprising a SAW resonator. The branching filter comprises a transmission SAW filter linked between an antenna terminal and a transmission terminal; a receiving SAW filter with different bandpass characteristics from the transmission SAW filter linked between the antenna terminal and the transmission terminal; a composite circuit that combines a frequency adjusting LC circuit linked between the antenna terminal and the transmission and receiving SAW filters with a branching filter circuit; and the branching filter circuit being structured to have a serial arm SAW resonator.
摘要:
A branching filter package has a SAW filter chip housing area which houses a piezo electric base, on which a transmitting SAW filter and a receiving SAW filter having a different frequency passing band with each other, are formed, and an impedance matching circuit and a branching circuit for the transmitting SAW filter and the receiving SAW filter.
摘要:
A surface acoustic wave duplexer having an antenna terminal, a transmitting terminal and a receiving terminal. The surface acoustic wave duplexer includes a transmitting SAW filter coupled between the antenna terminal and the transmitting terminal, a receiving SAW filter coupled between the antenna terminal and the receiving terminal, a common piezoelectric substrate on which both of the transmitting SAW filter and the receiving SAW filter are formed, a package covering the common piezoelectric substrate. The antenna terminal, the transmitting terminal and the receiving terminal are formed on the package, and a frequency adjusting circuit is coupled between the antenna terminal and the transmitting SAW filter or the receiving SAW filter. The frequency adjusting circuit has a capacitance element.
摘要:
A surface-acoustic-wave filter has a pair of series-arm surface-acoustic-wave resonators and a shunt-arm surface-acoustic-wave resonator coupled in a T configuration. An additional bridging surface-acoustic-wave resonator is coupled between the input and output terminals, in parallel with the series arm. The bridging surface-acoustic-wave resonator provides enhanced attenuation of spurious signals at multiples of the passband frequency.
摘要:
A branching filter package has a SAW filter chip housing area which houses a piezo electric base, on which a transmitting SAW filter and a receiving SAW filter having a different frequency passing band with each other, are formed, and an impedance matching circuit and a branching circuit for the transmitting SAW filter and the receiving SAW filter.
摘要:
A branching filter package has a SAW filter chip housing area which houses a piezo electric base, on which a transmitting SAW filter and a receiving SAW filter having a different frequency passing band with each other, are formed, and an impedance matching circuit and a branching circuit for the transmitting SAW filter and the receiving SAW filter.