Low-loss and high-flexibility radio frequency front-end circuit for multi-radio coexistence

A radio frequency (RF) front-end circuit for multi-radio coexistence, the RF front-end circuit comprising:

• a K-pole M-throw (KPMT) switch, having K poles including at least a first pole and a second pole as well as M throws including at least a first throw and a second throw, wherein the first pole among the K poles is coupled to a first radio, the second pole among the K poles is coupled to a second radio, and the first radio is different from the second radio, wherein any pole among the K poles of the KPMT switch is allowed to couple to any throw among the M throws of the KPMT switch;
• a single-pole N-throw (SPNT) switch, having a single pole as well as N throws including at least a first throw and another throw, wherein the single pole of the SPNT switch is allowed to couple to any throw among the N throws of the SPNT switch;
• a splitting and combining circuit, having an input node as well as a first output node and a second output node, wherein the first output node of the splitting and combining circuit is coupled to the first throw of the KPMT switch, and the second output node of the splitting and combining circuit is coupled to the second throw of the KPMT switch;
• and
• a low noise amplifier (LNA), having an input node and an output node, wherein the input node of the LNA is coupled to the first throw of the SPNT switch, and the output node of the LNA is coupled to the input node of the splitting and combining circuit, wherein there is no switch coupled between the output node of the LNA and the input node of the splitting and combining circuit.