Radio transceiver with impedance matched test port
First Claim
1. A radio transceiver for sending and receiving signals, with an antenna interconnect having a first impedance, the radio transceiver comprising:
- a) a selectively enabled matching circuit operatively connected to the antenna interconnect, for transforming the impedance of an external antenna having a second impedance to match the first impedance;
b) a test port operatively connected to the antenna interconnect;
c) at least a first tuning element which is operatively connected to said matching circuit to enable said matching circuit when no external device is connected to said test port, said first tuning element being operatively disconnected from said matching circuit to disable said matching circuit when an external device is connected to said test port, the impedance of said test port matching the first impedance whenever said matching circuit is disabled, whereby external devices having impedances that match the first impedance are selectively connectable to said test port.
3 Assignments
0 Petitions
Accused Products
Abstract
A radio transceiver is provided for wireless communications, having an interface connection that is selectable between either an antenna or a cable interface. The radio transceiver is engaged to the antenna through an impedance matching network which translates the antenna impedance to match that of the radio transceiver. The radio transceiver can, alternately, be connected to external test equipment or performance enhancement equipment through the cable interface. Since the radio transceiver has the same impedance as most external test equipment, the antenna matching network is not required or used when test equipment is connected to the cable interface. In the present invention the cable interface at least partially disconnects the matching network whenever the cable interface is in use. Once the antenna has been disconnected, the impedance of the cable interface matches that of the radio transceiver. Thus, the radio transceiver provides a convenient cable interface that matches the impedance of most test equipment, yet is easily switched to normal transmit/receive operation.
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Citations
20 Claims
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1. A radio transceiver for sending and receiving signals, with an antenna interconnect having a first impedance, the radio transceiver comprising:
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a) a selectively enabled matching circuit operatively connected to the antenna interconnect, for transforming the impedance of an external antenna having a second impedance to match the first impedance; b) a test port operatively connected to the antenna interconnect; c) at least a first tuning element which is operatively connected to said matching circuit to enable said matching circuit when no external device is connected to said test port, said first tuning element being operatively disconnected from said matching circuit to disable said matching circuit when an external device is connected to said test port, the impedance of said test port matching the first impedance whenever said matching circuit is disabled, whereby external devices having impedances that match the first impedance are selectively connectable to said test port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A radio transceiver for sending and receiving signals having an antenna interconnect with a first impedance, and comprising:
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a) an antenna operatively connected to the antenna interconnect, said antenna having a second impedance different from the first impedance; b) a matching circuit with at least three terminals and having at least a first tuning element, the first terminal of said matching circuit operatively connected to the antenna interconnect, and the second terminal of said matching circuit operatively connected to said antenna; c) a test port operatively connected to said matching circuit third terminal to selectively connect external devices to said antenna interconnect; and d) said first tuning element located adjacent said test port and operatively connected to said matching circuit first terminal for transforming a second impedance to match a first impedance when no external device is connected to said test port, said first tuning element operatively disconnected from said matching circuit first terminal to disable said matching network when an external device is connected to said test port, said test port impedance matching the first impedance whenever said matching circuit is disabled. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification