Methods and devices for enhancing performance of a power splitter are presented. According to one aspect, the power splitter is realized via lumped elements that include inductively coupled coils. Values of the lumped elements are based on an equivalent circuit of the power splitter that includes a star topology provided by a mutual inductance connected to a first port of the power splitter and respective inductances of the inductively coupled coils modified by the mutual inductance connected between the mutual inductance and respective second and third ports of the power splitter. A coupling factor of the inductively coupled coils has a magnitude that is in a range from 0.15 to 0.45. The coupling factor is negative. Respective capacitors are connected to the ports of the power splitter. The respective capacitors include switchable capacitors.

According to an aspect, method of combining a plurality of powers in an integrated circuit comprising receiving the plurality of powers on corresponding a plurality of primary coils, wherein each primary coil in the plurality of primary coils comprising a coupling part and a non-coupling part, coupling the plurality of powers to a secondary coil through only the coupling part, wherein the coupling part of every primary coil in the plurality of primary coils is inductively coupled to the secondary coil and nullifying power in the non-coupling part of a primary coils in the plurality of primary coil.

A device configured to support different numbers of outputs. The device includes an input port configured to receive an input signal. The device also includes a first transmission line characterized by a first characteristic impedance and coupled to a first output port. A switch is configured to either connect or disconnect the first transmission line to the input port. The device also includes a second transmission line characterized by a second characteristic impedance and coupled between the input port and a second output port. A controller is configured to activate the first switch to set a two-output mode or to deactivate the first switch to set a one-output mode. The second characteristic impedance is configured to be the same as the first characteristic impedance at the two-output mode or configured to be reduced to 1/{square root over (2)} of the first characteristic impedance at the one-output mode.

The present disclosure provides a multiplexer and a detector. The multiplexer includes a dielectric base plate, a connection structure, and a plurality of bandpass filters with different operation frequencies. A conductive thin film layer is disposed on a side plane of the dielectric base plate, the conductive thin film layer includes a signal wire and one or more grounding plates on a side of the signal wire. The connection structure is disposed on a side, on which the conductive thin film layer is provided, of the dielectric base plate, and includes a main branch and a plurality of branches, where the main branch is connected to the plurality of branches respectively, and the main branch serves as an input port of the multiplexer. Each of the plurality of bandpass filters with different operation frequencies is disposed on the side, on which the conductive thin film layer is provided, of the dielectric base plate, and is connected to the signal wire and the one or more grounding plates. For each bandpass filter of the plurality of bandpass filters, the bandpass filter includes a first port and a second port, the first port is connected to a corresponding branch of the plurality of branches, and the second port serves as one of a plurality of output ports of the multiplexer.