Wave separator
First Claim
Patent Images
1. A wave separator comprising:
- an n number of band pass filters including an n number or larger of mutually different pass bands where n is a natural number of 3 or larger; and
a common terminal commonly provided for the n number of band pass filters;
whereinat least one of the n number of band pass filters includes a surface acoustic wave filter or a bulk acoustic wave filter;
among the n number of band pass filters, for a first band pass filter that is one of a band pass filter having a center frequency of a pass band at a lowest side and a band pass filter having a center frequency of a pass band at a highest side and that has a larger or equal difference in a center frequency of a pass band from an adjacent band pass filter as compared with the other of the lowest side band pass filter and the highest side band pass filter and a band pass filter adjacent thereto, when f(1) is a center frequency of a pass band and B(1) is a susceptance value with the center frequency viewed from the common terminal; and
among the n number of band pass filters, for a second band pass filter having a pass band adjacent to the first band pass filter, when f(2) is a center frequency of a pass band and B(2) is a susceptance value with the center frequency viewed from the common terminal;
the first band pass filter satisfies one of a configuration (i) and a configuration (ii) for the second band pass filter as follows;
(i) B(2)×
{2×
f(2)−
f(1)}/f(1)<
B(1)<
B(2) if the first band pass filter is the band pass filter at the highest side; and
(ii) B(2)<
B(1)<
B(2)×
{2×
f(2)−
f(1)}/f(1) if the first band pass filter is the band pass filter at the lowest side.
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Abstract
A wave separator includes an n number (n being a natural number of 3 or larger) of band pass filters having an n number or larger of mutually different pass bands, and a common terminal. For a first of the band pass filters that is one of a band pass filter having a center frequency of a pass band at a lowest side and a band pass filter having a center frequency of a pass band at a highest side and that has a larger or equal difference in a center frequency of a pass band from an adjacent band pass filter as compared with the other band pass filter satisfies a predetermined configuration for a second band pass filter having a pass band adjacent to the first band pass filter.
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Citations
25 Claims
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1. A wave separator comprising:
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an n number of band pass filters including an n number or larger of mutually different pass bands where n is a natural number of 3 or larger; and a common terminal commonly provided for the n number of band pass filters;
whereinat least one of the n number of band pass filters includes a surface acoustic wave filter or a bulk acoustic wave filter; among the n number of band pass filters, for a first band pass filter that is one of a band pass filter having a center frequency of a pass band at a lowest side and a band pass filter having a center frequency of a pass band at a highest side and that has a larger or equal difference in a center frequency of a pass band from an adjacent band pass filter as compared with the other of the lowest side band pass filter and the highest side band pass filter and a band pass filter adjacent thereto, when f(1) is a center frequency of a pass band and B(1) is a susceptance value with the center frequency viewed from the common terminal; and among the n number of band pass filters, for a second band pass filter having a pass band adjacent to the first band pass filter, when f(2) is a center frequency of a pass band and B(2) is a susceptance value with the center frequency viewed from the common terminal; the first band pass filter satisfies one of a configuration (i) and a configuration (ii) for the second band pass filter as follows; (i) B(2)×
{2×
f(2)−
f(1)}/f(1)<
B(1)<
B(2) if the first band pass filter is the band pass filter at the highest side; and(ii) B(2)<
B(1)<
B(2)×
{2×
f(2)−
f(1)}/f(1) if the first band pass filter is the band pass filter at the lowest side. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification