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Document Title |
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7127215 |
Transmitting/receiving switch
A transmitting/receiving switch, in which a transmission terminal connected to a transmission circuit is connected to an antenna terminal through a first switching element, a filter for attenuating...
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6980776 |
Transceiver apparatus
The present invention provides a transceiver apparatus that permits miniaturization even when the antenna thereof is an unbalanced circuit and the transmitter circuit section and receiver circuit...
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6917258 |
High frequency switch
A high frequency switch configured particularly with FET switches. One end of second FET switch is connected between I/O port and reception port and the other end is ground. A parallel unit of...
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EP0618635B1 |
Antenna duplexer and transmitting/receiving apparatus using the same
Abstract of EP0618635 In an antenna duplexer, one antenna is used by switching transmission signals and reception signal having different frequencies. The antenna duplexer comprises a...
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6225865 |
Signal switching arrangement
A switching circuit for switching VHF/UHF signals. The switching circuit includes an amplifier for amplifying an input signal, a switching device for coupling the amplified signal to an output, a...
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5915212 |
System and method for achieving extended radio coverage and additional capacity using extended frequency bands
The present invention provides increased geographical coverage and system capacity for mobile/portable radio transceivers using adjacent and typically separate radio communication frequency bands....
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5789995 |
Low loss electronic radio frequency switch
A low loss electronic radio frequency (RF) switch (100) for switching RF energy between an antenna port (115), a receiver port (113) and a transmit port (101) used in a two-way radio transceiver....
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5689818 |
Mobile terminal device for telecommunications, including a switch circuit
A mobile terminal device for telecommunications includes a switch circuit which comprises two field effect transistors connected in series to an input terminal, an output terminal and a common...
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5634200 |
Antenna duplexer and transmitting/receiving apparatus using the same
In an antenna duplexer, one antenna is used by switching transmission signals and reception signals having different frequencies. The antenna duplexer includes a high-frequency switching circuit...
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5594394 |
Antenna diversity switching device with switching circuits between the receiver terminal and each antenna
An antenna switching device of the present invention includes: a transmitting terminal for receiving a transmitting signal; a first antenna terminal connected to a first antenna; a second antenna...
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5442812 |
Antenna switching apparatus for selectively connecting antenna to transmitter or receiver
An antenna switching apparatus for selectively connecting an antenna to either a transmitter for transmitting a transmitting signal having a transmitting frequency, or a receiver for receiving a...
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EP0618635A2 |
Antenna duplexer and transmitting/receiving apparatus using the same.
In an antenna duplexer, one antenna is used by switching transmission signals and reception signal having different frequencies. The antenna duplexer comprises a high-frequency switching circuit...
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5345473 |
Apparatus for providing two-way communication in underground facilities
The invention relates to an apparatus which is desiged for underground use in order to facilitate a two-way communication. The apparatus is operated within the frequency band 0.1-2 MHz, in order to...
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5276914 |
Dual-mode transceiver that switches out a large insertion loss filter during transmission
A antenna switching apparatus for a dual-mode transceiver which includes a transmission and reception antenna, a transmitting circuit, a receiving circuit, and a separating filter of large...
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5239686 |
Transceiver with rapid mode switching capability
An RF transceiver achieves a fast switching time between transmit and receive modes by leaving the transmit oscillator on all the time. The transmit chain comprises a wide pulling voltage...
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5206639 |
Single antenna dual frequency transponder
A single antenna, dual frequency transponder is provided. The transponder includes the antenna, first and second capacitors, a microprocessor/coder for generating a first and second control...
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5054114 |
Broadband RF transmit/receive switch
A broadband PIN diode transmit/receive switch. The switch is used for electrically coupling a single antenna alternately to a transmitter and to a receiver. A first PIN diode for switching is...
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4979232 |
Self-biasing solid-state T/R switch
A solid-state switch for coupling an antenna to either a transmitter or a receiver. The switch includes a pair of oppositely poled diodes and a low voltage power supply connected between the diodes...
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