Wireless terminal device
First Claim
1. A wireless terminal device simultaneously performing transmission and reception, comprising:
- a transmitting circuit generating a transmission wave;
a transmitting antenna emitting said transmission wave outwards;
a receiving antenna separate from said transmitting antenna;
a receiving circuit receiving a reception wave from said receiving antenna;
a single external input/output node; and
a transferring circuit for transferring the transmission wave from said transmitting circuit to said external input/output node while blocking the reception wave from entering said transmitting circuit and transferring the reception wave from said external input/output node to said receiving circuit while blocking the transmission wave from entering said receiving circuit.
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Accused Products
Abstract
A wireless terminal device includes a transmitting circuit, an isolator, a band pass filter, a switch, a transmitting antenna, a receiving circuit, a band pass filter, a switch, a receiving antenna, a high-pass filter, a low-pass filter and an input/output port. A transmission wave of a frequency is conveyed from the transmitting circuit to the input/output port via the isolator, the band pass filter and the low pass filter, and further to a vehicle antenna. Here, the transmission wave in the direction towards the receiving circuit is blocked by the high-pass filter. On the other hand, a reception wave of a frequency is conveyed from the vehicle antenna to the input/output port, and to the receiving circuit via the high-pass filter and the band pass filter. Here, the reception wave in the direction towards the transmitting circuit is blocked by the low-pass filter. Thus, transmission and reception can simultaneously be performed via a single input/output port, so that the wireless terminal device of the invention is compatible with a general wireless terminal device which performs simultaneous transmission/reception by one transmitting/receiving share antenna.
25 Citations
8 Claims
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1. A wireless terminal device simultaneously performing transmission and reception, comprising:
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a transmitting circuit generating a transmission wave;
a transmitting antenna emitting said transmission wave outwards;
a receiving antenna separate from said transmitting antenna;
a receiving circuit receiving a reception wave from said receiving antenna;
a single external input/output node; and
a transferring circuit for transferring the transmission wave from said transmitting circuit to said external input/output node while blocking the reception wave from entering said transmitting circuit and transferring the reception wave from said external input/output node to said receiving circuit while blocking the transmission wave from entering said receiving circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
a first switching circuit provided between said transmitting circuit and said transmitting antenna to selectively connect said transmitting circuit to said transmitting antenna or said transferring circuit; and
a second switching circuit provided between said receiving circuit and said receiving antenna to selectively connect said receiving circuit to said receiving antenna or said transferring circuit.
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3. The wireless terminal device according to claim 2, wherein said transferring circuit comprises:
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a first band pass filter provided between said external input/output node and said first switching circuit to allow said transmission wave to pass therethrough and block said reception wave; and
a second switching circuit provided between said receiving circuit and said receiving antenna to selectively connect said receiving circuit to said receiving antenna or said transferring circuit.
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4. The wireless terminal device of claim 3, wherein said first band pass filter is a low-pass filter;
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said second band pass filter is a high-pass filter.
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5. The wireless terminal device according to claim 2, wherein said transferring circuit includes a circulator having a first terminal connected to said external input/output node, a second terminal connected to said second switching circuit, and a third terminal connected to said first switching circuit.
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6. The wireless terminal device according to claim 2, further comprising:
a band pass filter provided between said second switching circuit and said receiving circuit to allow said reception wave to pass therethrough and block said transmission device.
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7. The wireless terminal device according to claim 2, further comprising:
a band pass filter provided between said first switching circuit and said transmitting circuit to allow said transmission wave to pass therethrough and block said reception wave.
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8. The wireless terminal device according to claim 1, wherein said transferring circuit includes a transmission/reception branching filter connected to said external input/output node, said transmitting circuit and said receiving circuit.
Specification