Switchable RF transmit/receive multiplexer

1. A switchable RF transmit/receive (TX/RX) multiplexer comprising:

a plurality of RF TX bandpass filters comprising a first RF TX bandpass filter, a second RF TX bandpass filter, a third RF TX bandpass filter, and a fourth RF TX bandpass filter, wherein each of the first RF TX bandpass filter and the second RF TX bandpass filter is coupled to a first filter connection node, and each of the third RF TX bandpass filter and the fourth RF TX bandpass filter is coupled to a second filter connection node distinct from the first filter connection node;

a first plurality of RF TX switching elements comprising a first RF TX switching element and a second RF TX switching element, wherein the first RF TX switching element is coupled between the first filter connection node and a first common connection node, which is coupled to a first RF antenna; and the second RF TX switching element is coupled between the second filter connection node and the first common connection node;

a first plurality of RF RX bandpass filters, wherein each of the first plurality of RF RX bandpass filters is coupled to the first common connection node; and

antenna switching circuitry, wherein each of the first plurality of RF RX bandpass filters is coupled to the first common connection node via the antenna switching circuitry, and the antenna switching circuitry is coupled:

between the first RF TX switching element and the first common connection node;

between a second common connection node and the first plurality of RF RX bandpass filters; and

between the second common connection node and the first plurality of RF TX switching elements; and

a second plurality of RF RX bandpass filters, wherein the antenna switching circuitry is further coupled between the first common connection node and the second plurality of RF RX bandpass filters, and is additionally coupled between the second common connection node and the second plurality of RF RX bandpass filters.

2. The switchable RF TX/RX multiplexer of claim 1 , further comprising

a plurality of RF phase-shifting circuits, which comprises a first RF phase-shifting circuit, a second RF phase-shifting circuit, a third RF phase-shifting circuit, and a fourth RF phase-shifting circuit; wherein the first RF phase-shifting circuit is coupled between the first RF TX bandpass filter and the first filter connection node, the second RF phase-shifting circuit is coupled between the second RF TX bandpass filter and the first filter connection node, the third RF phase-shifting circuit is coupled between the third RF TX bandpass filter and the second filter connection node, and the fourth RF phase-shifting circuit is coupled between the fourth RF TX bandpass filter and the second filter connection node.

3. The switchable RF TX/RX multiplexer of claim 1 , further comprising

a first plurality of RF phase-shifting circuits and a first plurality of phase-shift switching elements, wherein each of the first plurality of phase-shift switching elements is coupled between a corresponding one of the first plurality of RF phase-shifting circuits and the first common connection node.

4. The switchable RF TX/RX multiplexer of claim 1 wherein RF system control circuitry is configured to select one of a plurality of RF transmit signals using a function configuration signal, such that the switchable RF TX/RX multiplexer is configured to filter and forward the one of the plurality of RF transmit signals to the first common connection node using one of the plurality of RF TX bandpass filters.

5. The switchable RF TX/RX multiplexer of claim 1 configured to receive and process a plurality of first antenna, RF receive signals via the first RF antenna to provide a first plurality of upstream RF receive signals using the first plurality of RF RX bandpass filters.

6. The switchable RF TX/RX multiplexer of claim 5 wherein the first plurality of upstream RF receive signals are receive downlink carrier aggregation (RXDLCA) signals.

7. The switchable RF TX/RX multiplexer of claim 5 further configured to receive and process a plurality of second antenna, RF receive signals via a second RF antenna to provide a second plurality of upstream RF receive signals using the second plurality of RF RX bandpass filters.

8. The switchable RF TX/RX multiplexer of claim 1 wherein RF system control circuitry is configured to select connectivity of the antenna switching circuitry between the first common connection node and the first plurality of RF RX bandpass filters, and is further configured to select connectivity of the antenna switching circuitry between the first common connection node and the first plurality of RF TX switching elements using a function configuration signal.

9. The switchable RF TX/RX multiplexer of claim 1 wherein a passband of each of the first plurality of RF RX bandpass filters is equivalent to a corresponding passband of each of the second plurality of RF RX bandpass filters.

10. The switchable RF TX/RX multiplexer of claim 1 further comprising a third plurality of RF RX bandpass filters, wherein the antenna switching circuitry is further coupled between the first common connection node and the third plurality of RF RX bandpass filters, and is additionally coupled between the second common connection node and the third plurality of RF RX bandpass filters.

11. A switchable RF transmit/receive (TX/RX) multiplexer comprising:

a plurality of RF TX bandpass filters comprising a first RF TX bandpass filter, a second RF TX bandpass filter, a third RF TX bandpass filter, and a fourth RF TX bandpass filter, wherein each of the first RF TX bandpass filter and the second RF TX bandpass filter is coupled to a first filter connection node, and each of the third RF TX bandpass filter and the fourth RF TX bandpass filter is coupled to a second filter connection node distinct from the first filter connection node;

a first plurality of RF TX switching elements comprising a first RF TX switching element and a second RF TX switching element, wherein the first RF TX switching element is coupled between the first filter connection node and a first common connection node, which is coupled to a first RF antenna; and the second RF TX switching element is coupled between the second filter connection node and the first common connection node;

a first plurality of RF RX bandpass filters, wherein each of the first plurality of RF RX bandpass filters is coupled to the first common connection node;

antenna switching circuitry, wherein each of the first plurality of RF RX bandpass filters is coupled to the first common connection node via the antenna switching circuitry, and the antenna switching circuitry is coupled:

between the first RF TX switching element and the first common connection node;

between a second common connection node and the first plurality of RF RX bandpass filters; and

between the second common connection node and the first plurality of RF TX switching elements; and

a second plurality of RF TX switching elements, wherein the antenna switching circuitry is further coupled between the first common connection node and the second plurality of RF TX switching elements, and is additionally coupled between the second common connection node and the second plurality of RF TX switching elements.

12. The switchable RF TX/RX multiplexer of claim 11 , further comprising a plurality of RF phase-shifting circuits, which comprises a first RF phase-shifting circuit, a second RF phase-shifting circuit, a third RF phase-shifting circuit, and a fourth RF phase-shifting circuit; wherein the first RF phase-shifting circuit is coupled between the first RF TX bandpass filter and the first filter connection node, the second RF phase-shifting circuit is coupled between the second RF TX bandpass filter and the first filter connection node, the third RF phase-shifting circuit is coupled between the third RF TX bandpass filter and the second filter connection node, and the fourth RF phase-shifting circuit is coupled between the fourth RF TX bandpass filter and the second filter connection node.

13. The switchable RF TX/RX multiplexer of claim 11 , further comprising a first plurality of RF phase-shifting circuits and a first plurality of phase-shift switching elements, wherein each of the first plurality of phase-shift switching elements is coupled between a corresponding one of the first plurality of RF phase-shifting circuits and the first common connection node.

14. The switchable RF TX/RX multiplexer of claim 11 wherein RF system control circuitry is configured to select one of a plurality of RF transmit signals using a function configuration signal, such that the switchable RF TX/RX multiplexer is configured to filter and forward the one of the plurality of RF transmit signals to the first common connection node using one of the plurality of RF TX bandpass filters.

15. The switchable RF TX/RX multiplexer of claim 11 configured to receive and process a plurality of first antenna, RF receive signals via the first RF antenna to provide a first plurality of upstream RF receive signals using the first plurality of RF RX bandpass filters.

16. The switchable RF TX/RX multiplexer of claim 15 wherein the first plurality of upstream RF receive signals are receive downlink carrier aggregation (RXDLCA) signals.

17. The switchable RF TX/RX multiplexer of claim 15 further comprising a second plurality of RF RX bandpass filters and further configured to receive and process a plurality of second antenna, RF receive signals via a second RF antenna to provide a second plurality of upstream RF receive signals using the second plurality of RF RX bandpass filters.

18. The switchable RF TX/RX multiplexer of claim 11 wherein RF system control circuitry is configured to select connectivity of the antenna switching circuitry between the first common connection node and the first plurality of RF RX bandpass filters, and is further configured to select connectivity of the antenna switching circuitry between the first common connection node and the first plurality of RF TX switching elements using a function configuration signal.