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US 6,856,187 B2Granted
High frequency switch module
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHiroshi Kushitani, Yasushi Nagata, Takeo Yasuho
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Abstract
A high frequency switch module can handle transmit-receive signals of different frequency bands and realize excellent isolation. The high frequency switch module comprises a discriminating filter, a low-band high frequency switch, and a high-band frequency switch, wherein high-band 90-degree phase shifter that forms at least a high-band high frequency switch is configured by a high-pass filter, and a choke line is parallel-connected to the high-pass filter.
Claims3
A high frequency switch module, comprising:
- a discriminating filter which discriminates a receive signal into a high-band receive signal and a low-band receive signal, and respectively outputs the signals to a high-band input/output port and a low-band input/output port, and combines a high-band transmit signal input to the high-band input/output port with a low-band transmit signal input to the low-band input/output port;
- a low-band high frequency switch for switching an operation of feeding the low-band receive signal from the low-band input/output port to a low-band receiving port and an operation of feeding the low-band transmit signal fed to a low-band transmitting port to the low-band input/output port;
- and
- a high-band high frequency switch for switching an operation of feeding the high-band receive signal from the high-band input/output port to a high-band receiving port and an operation of feeding the high-band transmit signal fed to a high-band transmitting port to the high-band input/output port,
- wherein said high-band high frequency switch comprises:
- a first switch element connected between the high-band input/output port and the high-band transmitting port;
- a second switch element with one end connected to the high-band receiving port and the other end grounded;
- a high-band 90-degree phase shifter connected between the high-band input/output port and the high-band receiving port;
- and
- a high-band control port for controlling on-off operations of said first switch element and said second switch element;
- wherein said low-band high frequency switch comprises:
- a third switch element connected between the low-band input/output port and the low-band transmitting port;
- a fourth switch element with one end connected to the low-band receiving port and the other end grounded;
- a low-band 90-degree phase shifter connected between the low-band input/output port and the low-band receiving port;
- and
- a low-band control port for controlling on-off operations of said third switch element and said fourth switch element, and
- wherein at least one of said high-band 90-degree phase shifter and said low-band 90-degree phase shifter comprises:
- a high-pass filter circuit;
- and
- a choke line parallel-connected to said high-pass filter circuit, which is a conducting path of control voltage applied from the high-band control port or the low-band control port.
17 more elements
Dependencies are inferred from the claim text.