Duplexer having transmit and receive sections mounted on a single substrate
First Claim
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1. A duplexer comprising:
- a transmission section consisting of an isolator and a transmission circuit devoid of any resonators and comprising inductors and capacitors;
a reception section comprising a reception filter having a dielectric resonator apparatus; and
a single substrate on which said transmission and reception sections are mounted, said transmission circuit functioning to match said isolator with said reception filter.
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Abstract
A duplexer usable for both transmission and reception in a mobile communication apparatus such as a car phone has both its transmission section and reception section mounted on a single substrate. The transmission section is connected between an input terminal and an antenna terminal and includes an isolator and either a circuit having only inductors and capacitors or a trap circuit having a dielectric resonator and an inductor and a II-type low-pass filter having an inductor and capacitors. The reception section is comprised of a filter using dielectric resonators.
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Citations
14 Claims
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1. A duplexer comprising:
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a transmission section consisting of an isolator and a transmission circuit devoid of any resonators and comprising inductors and capacitors; a reception section comprising a reception filter having a dielectric resonator apparatus; and a single substrate on which said transmission and reception sections are mounted, said transmission circuit functioning to match said isolator with said reception filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A duplexer comprising:
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a transmission section comprising an isolator, a trap circuit having a single dielectric resonator and a capacitor, and a π
-type low-pass filter having an inductor and capacitors;a reception section comprising a reception filter having a dielectric resonator apparatus; and a single substrate on which said transmission and reception sections are mounted, said transmission circuit functioning to match said isolator with said reception filter. - View Dependent Claims (11, 12, 13, 14)
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Specification