Bandpass filter, duplexer, high-frequency module and communications device
First Claim
Patent Images
1. A comb-line bandpass filter comprising:
- a plurality of distributed constant line resonators, one end of each resonator being an open terminal and another end a ground terminal connected to a ground electrode, provided in a row and extending along a surface;
wherein said open terminals of outer distributed constant line resonators project further from the ground electrode along said surface than an inner distributed constant line resonator, thereby providing a line-of-sight between the outer resonators so as to form a capacitance and provide attenuation at both sides of a passband of the filter; and
wherein said inner distributed constant line resonator has a bent configuration.
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Abstract
A bandpass filter is capable of forming attenuation extremes on both sides of a passband. Multiple microstrip line resonators, one end of each being an open terminal and the other end connecting to a ground electrode, are provided in a row, and the inner microstrip line resonators are bent in a C-shape so that the open terminals of the outer microstrip line resonators project further than the inner microstrip line resonators. The line of sight between the open terminals of the microstrip line resonators is improved and capacitance is formed there, so that attenuation extremes can be formed on both sides of the passband, and the amount of attenuation can be increased.
41 Citations
23 Claims
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1. A comb-line bandpass filter comprising:
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a plurality of distributed constant line resonators, one end of each resonator being an open terminal and another end a ground terminal connected to a ground electrode, provided in a row and extending along a surface;
wherein said open terminals of outer distributed constant line resonators project further from the ground electrode along said surface than an inner distributed constant line resonator, thereby providing a line-of-sight between the outer resonators so as to form a capacitance and provide attenuation at both sides of a passband of the filter; and
wherein said inner distributed constant line resonator has a bent configuration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A comb-line bandpass filter comprising:
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a plurality of distributed constant line resonators including a pair of outer distributed constant line resonators and at least one inner distributed constant line resonator, one end of each resonator being an open terminal and another end a ground terminal connected to a ground electrode, said resonators being provided in a row and extending along a surface;
wherein said resonators project away from said ground electrode along said surface; and
wherein said at least one inner distributed constant line resonator has a bent configuration;
wherein said open terminals of said distributed constant line resonators are grounded via respective capacitances. - View Dependent Claims (14, 15, 20, 21, 22, 23)
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16. A comb-line bandpass filter comprising:
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a plurality of distributed constant line resonators including a pair of outer distributed constant line resonators and at least one inner distributed constant line resonator, one end of each resonator being an open terminal and another end a ground terminal connected to a ground electrode, said resonators being provided in a row and extending along a surface;
wherein said resonators project away from said ground electrode along said surface; and
wherein said at least one inner distributed constant line resonator has a bent configuration;
wherein there are a plurality of said inner distributed constant line resonators, each having a respective bent configuration, and said open terminals of said inner distributed constant line resonators are close together, thereby forming a capacitance and providing attenuation at both sides of the passband of the filter. - View Dependent Claims (17, 18, 19)
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Specification