Switched multiplexer device selectively connecting multiple filter circuits to common node for carrier aggregation

A wireless communication device for receiving and/or transmitting radio frequency (RF) wireless signals via a plurality of wireless carriers, in accordance with carrier aggregation or non-carrier aggregation operations for a plurality of predetermined bands, the wireless communication device comprising:

• an antenna connected to a common antenna node;
• a first filter circuit comprising a first matching network and one or more first band pass filters with corresponding passbands;
• a second filter circuit comprising a second matching network and two or more second band pass filters with corresponding passbands, the passbands of the one or more second band pass filters being different from the passbands of the one or more first band pass filters, respectively;
• and
• a loop-back matching network associated with the second filter circuit;
• and
• a multi-state switch configured to produce at least two different states comprising different filter circuit combinations by (i) selectively connecting the first filter circuit to the common antenna node, (ii) selectively connecting the second filter circuit to the common antenna node or to the loop-back matching network, and/or (iii) selectively connecting the loop-back matching network to the common antenna node and the second filter circuit,
• wherein each filter circuit combination includes a combined matching network comprising at least one of the first matching network, the second matching network and the loop-back matching network.

A wireless communication device for receiving and/or transmitting radio frequency (RF) wireless signals via a plurality of wireless carriers in accordance with carrier aggregation operation for a plurality of predetermined bands, the wireless communication device comprising:

• an antenna connected to a common antenna node;
• a plurality of filter circuits comprising corresponding band pass filters, respectively;
• a plurality of individual matching networks;
• and
• a multi-state switch configured to selectively connect at least two filter circuits of the plurality of filter circuits and at least one individual matching network of the plurality of individual matching networks to the common antenna node, in response to an operational environment, wherein the at least one individual matching network is selected to enable impedance matching among the connected at least two filter circuits and the common antenna node.