SHARED LTE-ISM RF FRONT-END AND ANTENNA
A front-end module and antenna can be shared between two radio transceivers operating in coexistent radio frequency (RF) communication bands. For example, a first of the two radio transceivers may operate in one of a Long Term Evolution (LTE) band or an Industrial Scientific Medical (ISM) band, while a second of the two radio transceivers may operate in an alternative one of the LTE band and the ISM band. Use of a diplexer in the shared front-end module to pass RF signals between the two radio transceivers and the shared antenna can allow for sufficient isolation to avoid interference between transmit and receive operations in the coexistent RF communication bands.
1 . An apparatus, comprising:
a first radio transceiver associated with front-end circuitry operative in a first frequency band;
a second radio transceiver operative in a second frequency band coexistent with the first frequency band, and sharing the front-end circuitry;
a diplexer for effectuating the sharing of the front-end circuitry; and
an antenna connected to the diplexer, and configured to transmit and receive radio frequency (RF) signals for the first and second radio transceivers in the first and second frequency bands.
2 . The apparatus of claim 1 , wherein the first frequency band comprises an Industrial Scientific Medical (ISM) band operative between 2.4 GHz and 2.5 GHz.
3 . The apparatus of claim 1 , wherein the second frequency band comprises a Long Term Evolution (LTE) band operative between 2.3 GHz and 2.62 GHz.
4 . The apparatus of claim 1 , wherein the diplexer comprises a passive circuit element having first and second ports connected, via the front-end circuitry, to the first and second radio transceivers, respectively, and a third port connected to the antenna.
5 . The apparatus of claim 1 , wherein the front-end circuitry comprises:
at least one power amplifier configured to amplify a first RF signal for transmission via the antenna in the first frequency band, the first RF signal being created from a first baseband signal generated by the first radio transceiver; and
at least one low noise amplifier configured to amplify a second RF signal received at the antenna in the first frequency band for conversion into a second baseband signal by the first radio transceiver.
6 . The apparatus of claim 1 , wherein the front-end circuitry comprises:
at least one power amplifier configured to amplify a first RF signal for transmission via the antenna in the second frequency band, the first RF signal being created from a first baseband signal generated by the second radio transceiver; and
at least one low noise amplifier configured to amplify a second RF signal received at the antenna in the second frequency band for conversion into a second baseband signal by the second radio transceiver.
7 . The apparatus of claim 1 , wherein a first RF signal transmitted via the antenna and a second RF signal received via the antenna are isolated from each other at a level greater than or equal to 15 dB.
8 . The apparatus of claim 7 , wherein the first RF signal is transmitted via the antenna over the first frequency band, and the second RF signal is received via the antenna over the second frequency band.
9 . The apparatus of claim 7 , wherein the first RF signal is transmitted via the antenna over the second frequency band, and the second RF signal is received via the antenna over the first frequency band.
10 . A computer program product, embodied on a non-transitory computer-readable medium, comprising:
computer code for producing a first RF signal at a first radio transceiver;
computer code for receiving a second RF signal from an antenna;
computer code for passing the first RF signal to the antenna for transmission, through a front-end module and a diplexer, and passing the second RF signal from the antenna through the diplexer and the front-end module to a second radio transceiver, the front-end module being shared between the first and second radio transceivers, and wherein the transmission of the first RF signal and the receipt of the second RF signal are isolated from each other.
11 . The computer program product of claim 10 further comprising, computer code for transmitting the first RF signal in a first frequency band comprising an Industrial Scientific Medical (ISM) band operative between 2.4 GHz and 2.5 GHz.
12 . The computer program product of claim 10 further comprising, computer code for receiving the second RF signal is received in a second frequency band comprising a Long Term Evolution (LTE) band operative between 2.3 GHz and 2.62 GHz.
13 . The computer program product of claim 10 further comprising:
computer code for amplifying, via at least one power amplifier, the first RF signal for transmission via the antenna in the first frequency band; and
computer code for amplifying, via at least one low noise amplifier, the second RF signal received at the antenna in the first frequency band.
14 . The computer program product of claim 13 further comprising:
computer code for creating the first RF signal from a first baseband signal generated by the first radio transceiver; and
computer code for converting, in the first radio transceiver, the second RF signal received at the antenna to a second baseband signal.
15 . The computer program product of claim 10 , wherein the front-end circuitry comprises:
computer code for amplifying, via at least one power amplifier, the first RF signal for transmission via the antenna in the second frequency band; and
computer code for amplifying, via at least one low noise amplifier, the second RF signal received at the antenna in the second frequency.
16 . The computer program product of claim 14 further comprising:
computer code for creating the first RF signal from a first baseband signal generated by the second radio transceiver; and
computer code for converting, in the second radio transceiver, the second RF signal received at the antenna to a second baseband signal.
17 . The computer program product of claim 10 , wherein a level of the isolation between the transmission of the first RF signal and the receipt of the second RF signal is greater than or equal to 15 dB.
18 . A method, comprising:
processing a first radio frequency (RF) signal received from an antenna over a first RF band of a plurality of RF bands in which the antenna operates;
passing the first RF signal to a first radio transceiver corresponding to the first RF band;
receiving a second RF signal from a second radio transceiver corresponding to a second RF band of the plurality of RF bands in which the antenna operates; and
processing the second RF signal for transmission through the antenna over the second RF band, the transmission of the second RF signal occurring simultaneously to the receipt of the first RF signal and in accordance with a level of isolation that prevents interference between the receipt of the first RF signal and the transmission of the second RF signal.
19 . The method of claim 18 , wherein the first RF band comprises an Industrial Scientific Medical (ISM) band operative between 2.4 GHz and 2.5 GHz, and wherein the second RF band comprises a Long Term Evolution (LTE) band operative between 2.3 GHz and 2.62 GHz.
20 . The method of claim 18 further comprising one of:
receiving a third RF signal from the second radio transceiver corresponding to a third RF band of the plurality of RF bands in which the antenna operates, and processing the third RF signal for transmission through the antenna over the third RF band, the transmission of the third RF signal occurring simultaneously to the receipt of the first RF signal and the transmission of the second RF signal, and in accordance with the level of isolation that further prevents interference between the receipt of the first RF signal, the transmission of the second RF signal, and the transmission of the third RF signal; or
processing a fourth RF signal received from the antenna over a fourth RF band of the plurality of RF bands in which the antenna operates, and passing the fourth RF signal to the second radio transceiver that further corresponds to the fourth RF band, the receipt of the fourth RF signal occurring simultaneously to the receipt of the first RF signal and the transmission of the second RF signal, and in accordance with the level of isolation that further prevents interference between the receipt of the first RF signal, the transmission of the second RF signal, and the receipt of the fourth RF signal.