High-frequency circuit apparatus and communication apparatus
First Claim
1. A high-frequency circuit apparatus comprising:
- an antenna duplexer of a frequency variable type having a first external terminal, a second external terminal, and an antenna terminal;
a first change-over switch which receives an input signal and is adapted to switch said input signal from said antenna terminal to said duplexer or a filter and visa versa;
a second change-over switch which is electrically connected to said second external terminal and;
said filter being electrically connected across said first change-over switch and said second change-over switch, wherein said first external terminal is a transmitting terminal, said second external terminal is a receiving terminal, and said filter is a filter for reception.
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Abstract
Provided is a high-frequency circuit apparatus and a communication apparatus whose consumption current is small and the inserting loss is small. One embodiment provides a high-frequency circuit apparatus constructed by an antenna duplexer of a frequency variable type; a first change-over switch which is electrically connected to an antenna terminal in the antenna duplexer; a second change-over switch which is electrically connected to a receiving terminal in the antenna duplexer; and a filter for reception which is electrically connected across the first and second change-over switches. As for the first and second change-over switches, a GaAs switch and a PIN diode switch, etc. are used. As for the filter for reception, a surface acoustic wave filter or monolithic ceramic LC filter, etc. is used.
58 Citations
6 Claims
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1. A high-frequency circuit apparatus comprising:
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an antenna duplexer of a frequency variable type having a first external terminal, a second external terminal, and an antenna terminal;
a first change-over switch which receives an input signal and is adapted to switch said input signal from said antenna terminal to said duplexer or a filter and visa versa;
a second change-over switch which is electrically connected to said second external terminal and;
said filter being electrically connected across said first change-over switch and said second change-over switch, wherein said first external terminal is a transmitting terminal, said second external terminal is a receiving terminal, and said filter is a filter for reception. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification
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- Resources
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Current AssigneeMurata Manufacturing Co Limited
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Original AssigneeMurata Manufacturing Co Limited
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InventorsYamamoto, Toshihiro, Atokawa, Masayuki
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Primary Examiner(s)APPIAH, CHARLES NANA
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Application NumberUS09/591,272Time in Patent Office1,355 DaysField of Search455/73, 455/74, 455/78, 455/82, 455/83, 455/84, 455/574, 455/129, 455/343, 455/552, 333/104, 333/103, 333/132, 333/126, 333/129, 333/134US Class Current455/82CPC Class CodesH04B 1/0057 using diplexing or multiple...H04B 1/006 using switches for selectin...H04B 1/48 in circuits for connecting ...
