Antenna sharing device and wireless communication terminal using the same
AssigneeHitachi, Ltd.
InventorsNobuhiko Shibagaki, Mitsutaka Hikita, Kazuyuki Sakiyama, Osamu Hikino
Life of this patent
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Abstract
A compact, inexpensive antenna sharing device meeting requirements in terms of transmitter distortion characteristic and ESD characteristic is provided which separates and combines signals transmitted and received in first to third signal bands and which thereby enables an antenna terminal to be shared as a common terminal. It includes a diplexer realizing an attenuation characteristic for protection against ESD, a compound semiconductor switch with an IIP3 of 66 dBm or more, and an inexpensive PIN diode switch.
Claims19
An antenna sharing device which has a diplexer and which switches paths for signals in a plurality of frequency bands,
- wherein said diplexer comprising:
- at least a common signal terminal which is connected to an antenna and which transmits and receives signals in said plurality of frequency bands;
- a high-pass filter;
- and
- units for distributively outputting signals in each frequency band selected from said receive signals and for combining and outputting transmit signals to said signal terminal;
- wherein said antenna sharing device further comprising:
- a first high-frequency switch which is connected to said high-pass filter and which separates the transmit and receive signals in said plurality of frequency bands;
- and
- a second high-frequency switch which is connected to a first output terminal of said first high-frequency switch and which separates said transmit signal and the receive signal in a frequency band separated from said plurality of frequency bands;
- wherein said first high-frequency switch includes compound semiconductors and said second high-frequency switch connected to said first output terminal includes PIN diodes.
An antenna sharing device which has a diplexer and which switches paths for signals in at least first, second and third frequency bands, wherein a maximum frequency of said first frequency band is lower than a minimum frequency of said second and third frequency bands;
- wherein said diplexer comprising:
- a first signal terminal which is a common signal terminal for transmitting and receiving signals in each of said frequency bands;
- a second signal terminal which outputs signals in said first frequency band selected from the receive signals;
- and
- a third signal terminal which outputs signals in said second and third frequency bands, and
- units for distributing receive signals inputted to said first signal terminal to said second and third signal terminals and for combining transmit signals inputted to said second and third signal terminals and outputting the combined signal to said first signal terminal;
- said antenna sharing device further comprising:
- a first high-frequency switch which is connected to said third signal terminal of said diplexer and which separates said transmit and receive signals in said second frequency band and said transmit and receive signals in said third frequency band;
- and
- a second high-frequency switch which is connected to a first output terminal of said first high-frequency switch and which separates said transmit signal and said receive signal in said second frequency band;
- and
- wherein said first high-frequency switch includes compound semiconductors and said second high-frequency switch connected to said first output terminal includes PIN diodes.
An antenna sharing device which has a diplexer and which switches paths for signals in at least first, second and third frequency bands, wherein a maximum frequency of said first frequency band is lower than a minimum frequency of said second and third frequency bands;
- wherein said diplexer comprising:
- a first signal terminal which is a common signal terminal connected to an antenna and used to transmit and receive signals in each of said frequency bands;
- a low-pass filter which outputs signals in said first frequency band selected from said receive signals;
- and
- a high-pass filter which outputs signals in said second and third frequency bands selected from said receive signals;
- said antenna sharing device further comprising:
- a first high-frequency switch which is connected to said high-pass filter of said diplexer and which separates said transmit and receive signals in said second frequency band and said transmit and receive signals in said third frequency band;
- and
- a second high-frequency switch which is connected to a first output terminal of said first high-frequency switch and which separates said transmit signal and said receive signal in said second frequency band;
- and
- wherein said first high-frequency switch includes compound semiconductors and said second high-frequency switch connected to said first output terminal includes PIN diodes.
Dependencies are inferred from the claim text.