Surface acoustic wave device using two parallel connected filters with different passbands
First Claim
1. A surface acoustic wave device comprising:
- a first surface acoustic wave filter connected between an input terminal and an output terminal;
a second surface acoustic wave filter having a different center frequency than that of said first surface acoustic wave filter, and which is connected between said input terminal and said output terminal and in parallel with said first surface acoustic wave filter; and
at least one one-port surface acoustic wave resonator connected in series with the first surface acoustic wave filter or the second surface acoustic wave filter, on at least one side between said input terminal and at least one of said first and second surface acoustic wave filters, or between said output terminal and at least one of said first and second surface acoustic wave filters;
wherein the anti-resonance frequency of said one one-port surface acoustic wave resonator is positioned on the side of higher frequencies than those of the pass band of the surface acoustic wave filter disposed on the side where said one-port surface acoustic wave resonator is connected in series; and
in at least one one-port surface acoustic wave resonator of said one-port surface acoustic wave resonators, the interdigital transducers are weighted.
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Accused Products
Abstract
A surface acoustic wave device includes a first surface acoustic wave filter connected between an input terminal and an output terminal, a second surface acoustic wave filter having a different center frequency from that of the first surface acoustic wave filter, and which is connected between the input terminal and the output terminal and in parallel with the first surface acoustic wave filter, and at least one one-port surface acoustic wave resonator connected in series with the first or second surface acoustic wave filter, on at least one side between the input terminal and at least one of the first and second surface acoustic wave filters, or between the output terminal and at least one of the first and second surface acoustic wave filters. The anti-resonance frequency of the one one-port surface acoustic wave resonator is positioned on the side of higher frequencies than those of the pass band of the surface acoustic wave filter disposed on the side where the one-port surface acoustic wave resonator is connected in series.
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Citations
32 Claims
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1. A surface acoustic wave device comprising:
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a first surface acoustic wave filter connected between an input terminal and an output terminal;
a second surface acoustic wave filter having a different center frequency than that of said first surface acoustic wave filter, and which is connected between said input terminal and said output terminal and in parallel with said first surface acoustic wave filter; and
at least one one-port surface acoustic wave resonator connected in series with the first surface acoustic wave filter or the second surface acoustic wave filter, on at least one side between said input terminal and at least one of said first and second surface acoustic wave filters, or between said output terminal and at least one of said first and second surface acoustic wave filters;
whereinthe anti-resonance frequency of said one one-port surface acoustic wave resonator is positioned on the side of higher frequencies than those of the pass band of the surface acoustic wave filter disposed on the side where said one-port surface acoustic wave resonator is connected in series; and
in at least one one-port surface acoustic wave resonator of said one-port surface acoustic wave resonators, the interdigital transducers are weighted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
a surface acoustic wave device as claimed in claim 1, defining a band-pass filter; and
a mounting substrate mounting the surface acoustic wave device.
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10. A surface acoustic wave device comprising:
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a first surface acoustic wave filter connected between an input terminal and an output terminal;
a second surface acoustic wave filter having a different center frequency than that of said first surface acoustic wave filter, and which is connected between said input terminal and said output terminal and in parallel with said first surface acoustic wave filter;
at least one one-port surface acoustic wave resonator connected in series with the first surface acoustic wave filter or the second surface acoustic wave filter, on at least one side between said input terminal and at least one of said first and second surface acoustic wave filters, or between said output terminal and at least one of said first and second surface acoustic wave filters; and
an inductance element additionally connected in parallel with each of said input and output terminals;
whereinthe anti-resonance frequency of said one one-port surface acoustic wave resonator is positioned on the side of higher frequencies than those of the pass band of the surface acoustic wave filter disposed on the side where said one-port surface acoustic wave resonator is connected in series;
the inductance value of the inductance element additionally connected in parallel with said input terminal differs from the inductance value of the inductance element additionally connected in parallel with said output terminal. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A surface acoustic wave device comprising:
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a first surface acoustic wave filter connected between an input terminal and an output terminal;
a second surface acoustic wave filter having a different center frequency than that of said first surface acoustic wave filter, and which is connected between said input terminal and said output terminal and in parallel with said first surface acoustic wave filter; and
at least one one-port surface acoustic wave resonator connected in series with the first surface acoustic wave filter or the second surface acoustic wave filter, on at least one side between said input terminal and at least one of said first and second surface acoustic wave filters, or between said output terminal and at least one of said first and second surface acoustic wave filters;
whereinthe anti-resonance frequency of said one one-port surface acoustic wave resonator is positioned on the side of higher frequencies than those of the pass band of the surface acoustic wave filter disposed on the side where said one-port surface acoustic wave resonator is connected in series; and
the electrode film thickness of said first surface acoustic wave filter differs from that of said second surface acoustic wave filter. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A surface acoustic wave device comprising:
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a first surface acoustic wave filter connected between an input terminal and an output terminal;
a second surface acoustic wave filter having a different center frequency than that of said first surface acoustic wave filter, and which is connected between said input terminal and said output terminal and in parallel with said first surface acoustic wave filter; and
at least one one-port surface acoustic wave resonator connected in series with the first surface acoustic wave filter or the second surface acoustic wave filter, on at least one side between said input terminal and at least one of said first and second surface acoustic wave filters, or between said output terminal and at least one of said first and second surface acoustic wave filters;
whereinthe anti-resonance frequency of said one one-port surface acoustic wave resonator is positioned on the side of higher frequencies than those of the pass band of the surface acoustic wave filter disposed on the side where said one-port surface acoustic wave resonator is connected in series; and
at least one of said input terminal and said output terminal are balanced-signal terminals. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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Specification