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Class Information
Number: 333/133
Name: Wave transmission lines and networks > Plural channel systems > Having branched circuits > For providing frequency separation > Utilizing electromechanical transducer
Description: Subject matter wherein an electrical wave driven mechanical vibrator determines the frequency characteristic of the branched circuit.










Patents under this class:
1 2 3 4 5 6 7 8 9 10 11

Patent Number Title Of Patent Date Issued
6759924 Multi-frequency antenna duplexer Jul. 6, 2004
6756864 Branching filter and communication apparatus Jun. 29, 2004
6756863 High-frequency oscillator of frequency switching type and high-frequency oscillation method Jun. 29, 2004
6750737 High frequency switch and radio communication apparatus with layered body for saw filter mounting Jun. 15, 2004
6744333 Surface acoustic wave filter device with balanced and unbalanced terminals Jun. 1, 2004
6741146 Filter structure comprising piezoelectric resonators May. 25, 2004
6741145 Filter structure and arrangement comprising piezoelectric resonators May. 25, 2004
6737939 Carbon nanotube array RF filter May. 18, 2004
6737936 Surface-acoustic-wave duplexer with improved isolation May. 18, 2004
6731185 Surface acoustic wave device and communication apparatus May. 4, 2004
6731184 High frequency switching component May. 4, 2004
6731188 Surface acoustic wave filter device with an unbalanced-to-balanced conversion function May. 4, 2004
6724278 Duplex filtering Apr. 20, 2004
6720846 Surface acoustic wave device with KNb03 piezoelectric thin film, frequency filter, oscillator, electronic circuit, and electronic apparatus Apr. 13, 2004
6720842 Surface acoustic wave filter device having first through third surface acoustic wave filter elements Apr. 13, 2004
6720844 Coupled resonator bulk acoustic wave filter Apr. 13, 2004
6717489 Longitudinally connected resonator type surface acoustic wave filter Apr. 6, 2004
6717487 Surface acoustic wave filter, and communication apparatus using the same Apr. 6, 2004
6714099 Radio frequency filter, radio frequency circuit, antenna duplexer and radio terminal Mar. 30, 2004
6714098 SAW antenna duplexer having a phase shifter with less than 50 ohm characteristic impedance Mar. 30, 2004
6710677 Band reject filters Mar. 23, 2004
6710676 Surface acoustic wave filter device Mar. 23, 2004
6693501 Surface acoustic wave apparatus using filters with overlapped propagation paths and communications unit Feb. 17, 2004
6683515 Surface-acoustic-wave filter providing outputs with different delay times and communications unit Jan. 27, 2004
6680660 Method and apparatus for selecting at least one desired channel utilizing a bank of vibrating micromechanical apparatus Jan. 20, 2004
6674345 Surface acoustic wave filter and communication device using the filter Jan. 6, 2004
6670866 Bulk acoustic wave resonator with two piezoelectric layers as balun in filters and duplexers Dec. 30, 2003
6670868 Surface acoustic wave filter device Dec. 30, 2003
6664871 Cascaded surface acoustic wave filter system for cancelling time spurious responses Dec. 16, 2003
6661312 Multilayer filter array Dec. 9, 2003
6657518 Notch filter circuit apparatus Dec. 2, 2003
6650206 Surface acoustic wave filter and communication apparatus with the same Nov. 18, 2003
6633748 Composite high frequency component and mobile communication device including the same Oct. 14, 2003
6628178 Radio frequency module parts including surface acoustic wave elements and manufacturing method thereof Sep. 30, 2003
6621380 Longitudinally coupled resonator type surface acoustic wave filter having narrow electrode finger pitch sections Sep. 16, 2003
6608536 Constant impedance filter Aug. 19, 2003
6606016 Surface acoustic wave device using two parallel connected filters with different passbands Aug. 12, 2003
6597262 Surface acoustic wave filter and communication apparatus incorporating the same Jul. 22, 2003
6593831 Method and apparatus for filtering signals in a subsystem including a power amplifier utilizing a bank of vibrating micromechanical apparatus Jul. 15, 2003
6587016 Surface acoustic wave filter with angled reflection by piezoelectric substrate reflection edges, duplexer, and communication device Jul. 1, 2003
6583691 Longitudinally coupled resonator type surface acoustic wave filter with an IDT having a narrow pitch portion Jun. 24, 2003
6570469 Multilayer ceramic device including two ceramic layers with multilayer circuit patterns that can support semiconductor and saw chips May. 27, 2003
6566981 Surface acoustic wave device having plural ground conductor films in the housing cavity May. 20, 2003
6563396 Composite high frequency component and mobile communication apparatus incorporating the same May. 13, 2003
6556100 Surface acoustic wave filter with a passband formed by a longitudinally coupled filter and a resonator inductance Apr. 29, 2003
6549100 Surface acoustic wave lattice filter with different lattice and series arm capacitance ratios and communication device using same Apr. 15, 2003
6531937 Edge reflection type surface acoustic wave filter Mar. 11, 2003
6531933 Filter unit having two attenuation poles Mar. 11, 2003
6525626 Duplexer and mobile communication device using the same Feb. 25, 2003
6525624 Band-switchable surface acoustic wave antenna duplexer and mobile radio terminal Feb. 25, 2003

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