Tunable filter arrangement
According to the present disclosure there is provided a front-end module comprising a first antenna port and a second antenna port, a first filter forming a first signal path with the first antenna port and a second filter forming a second signal path with the second antenna port, the first or second filter being an adjustable filter. There is also provided a wireless device.
1 . A front-end module comprising:
a first antenna port and a second antenna port;
a first filter forming a first signal path with the first antenna port;
a second filter forming a second signal path with the second antenna port, the first or second filter being an adjustable filter; and
a plurality of transceivers including a first transceiver and a second transceiver, the first transceiver being coupled to a first switching device, the first switching device being configured to selectively couple the first transceiver to one of the first signal path or second signal path, and the second transceiver being coupled to a second switching device, the second switching device being configured to selectively couple the second transceiver to one of the first signal path or second signal path.
2 . The front-end module of claim 1 wherein the first filter is a bandpass filter and the second filter is a tunable bandpass filter.
3 . The front-end module of claim 2 wherein the bandpass filter has a passband configured to pass transportation channels.
4 . The front-end module of claim 1 wherein the first filter is a notch filter having a stop-band and a pass-band.
5 . The front-end module of claim 4 wherein the notch filter is configured to be tuned and can be switched on or off.
6 . The front-end module of claim 4 wherein the second filter is a bandpass filter having a passband within the stop-band of the notch filter and wherein the bandpass filter has a passband configured to pass transportation channels.
7 . The front-end module of claim 6 wherein the bandpass filter has a passband of 5855-5925 Mhz.
8 . The front-end module of claim 1 wherein the adjustable filter is one of manually adjusted or electronically adjusted.
9 . The front-end module of claim 1 further comprising a first power amplifier, wherein the first power amplifier is connected to the first and second signal paths via a switch.
10 . The front-end module of claim 1 further comprising a first power amplifier and a second power amplifier, wherein the first power amplifier is connected to the first signal path, and the second power amplifier is connected to the second signal path.
11 . The front-end module of claim 1 further comprising a first power amplifier and a second power amplifier, wherein the first and second signal paths are each connectable to at least one of the first and second power amplifiers.
12 . The front-end module of claim 1 further comprising a first power amplifier and a second power amplifier, wherein each of the first and second signal paths are connectable to either the first or second power amplifiers and wherein the second power amplifier is configured to transmit transportation band signals.
13 . The front-end module of claim 1 further comprising a first low-noise amplifier, wherein the first low-noise amplifier is connectable to either the first or second filter.
14 . The front-end module of claim 13 wherein the first low-noise amplifier is an active splitter low noise amplifier.
15 . The front-end module of claim 13 further comprising a second low-noise amplifier, wherein the first low-noise amplifier is connected to the first filter, and the second low-noise amplifier is connected to the second filter.
16 . The front-end module of claim 13 further comprising a second low-noise amplifier, wherein the first and second low-noise amplifiers are each connectable to either the first or second filters.
17 . The front-end module of claim 16 wherein the second low-noise amplifier is configured to process transportation band signals.
18 . The front-end module of claim 1 further comprising a third filter forming a third signal path with the second antenna port, wherein the second filter is a receive filter and the third filter is a transmit filter, wherein the second and third filters are connected to an antenna switch module, the antenna switch module being connected to the second antenna port, and wherein the second and third filters are tunable filters.
19 . A wireless device comprising:
a first antenna;
a second antenna;
a radio-frequency module, the radio-frequency module including a front-end configuration comprising:
a first antenna port coupled to the first antenna;
a second antenna port coupled to the second antenna;
a first filter forming a first signal path with the first antenna port; and
a second filter forming a second signal path with the second antenna port, the first or second filter being an adjustable filter, the first filter having a first passband and the second filter having a second passband, the first passband being separated from the second passband by at least 20 MHz.
20 . The wireless device of claim 19 wherein the first filter is a bandpass filter and the second filter is a tunable bandpass filter.