Multiplexer and detector

1 . A multiplexer, comprising:

a dielectric base plate, wherein a conductive thin film layer is disposed on a side plane of the dielectric base plate, the conductive thin film layer comprises a signal wire and one or more grounding plates on a side of the signal wire, and there is one or more gaps between the signal wire and the one or more grounding plates;

a connection structure, disposed on the conductive thin film layer, and comprising a main branch and a plurality of branches, wherein the main branch is connected to the plurality of branches respectively, and the main branch serves as an input port of the multiplexer; and

a plurality of bandpass filters with different operation frequencies, wherein each of the plurality of bandpass filters is connected to the signal wire and the one or more grounding plates;

wherein each bandpass filter comprises a first port and a second port, the first port is connected to a corresponding branch respectively, and the second port serves as one of output ports of the multiplexer.

2 . The multiplexer of claim 1 , wherein

the plurality of branches comprises a first branch and a second branch;

the plurality of bandpass filters with different operation frequencies comprise a first bandpass filter and a second bandpass filter;

the first port of the first bandpass filter is connected to the first branch; and

the first port of the second bandpass filter is connected to the second branch.

3 . The multiplexer of claim 1 , wherein an impedance of each branch matches an operation frequency of a bandpass filter which corresponds to the branch, and does not match an operation frequency of a bandpass filter which corresponds to other branch.

4 . The multiplexer of claim 1 , wherein each bandpass filter comprises one or more first resonant units and one or more second resonant units;

each of the one or more first resonant units and the one or more second resonant units generates a zero point and a pole point;

the one or more first resonant units are coupled to the one or more second resonant units; and

frequencies of pole points are located between frequencies of zero points.

5 . The multiplexer of claim 4 , wherein two sides of the signal wire both are provided with one or more grounding plates;

each of the one or more first resonant units and the one or more second resonant units is connected to the signal wire and the one or more grounding plates on the two sides of the signal wire, and the one or more first resonant units and the one or more second resonant units both are symmetrically disposed with respect to the signal wire.

6 . The multiplexer of claim 4 , wherein

the one or more first resonant units are coupled to the one or more second resonant units by the signal wire; and/or

the one or more first resonant units and the one or more second resonant units are quasi-lumped resonant units.

7 . The multiplexer of claim 4 , wherein each bandpass filter comprises two first resonant units and two second resonant units;

one first resonant unit of the two first resonant units is coupled to one second resonant unit of the two second resonant units, to form a first coupling unit;

other first resonant unit of the two first resonant units is coupled to other second resonant unit of the two second resonant units, to form a second coupling unit; and

the first coupling unit is coupled to the second coupling unit via the two first resonant units or the two second resonant units;

the first coupling unit and the second coupling unit are symmetrically disposed with respect to a coupling part between the first coupling unit and the second coupling unit;

and the first coupling unit is coupled to the second coupling unit by the signal wire.

8 . The multiplexer of claim 4 , wherein

each of the one or more first resonant units comprises one or more first capacitors and one or more first inductors; wherein the one or more first capacitors and the one or more first inductors are connected in parallel between the signal wire and the one or more grounding plates, wherein each of the one or more first capacitors is an interdigital capacitor; and

each of the one or more second resonant units comprises a second capacitor, one or more second inductors, and one or more third inductors; wherein the second capacitor is connected in series with the signal wire, the one or more second inductors are connected in parallel with the second capacitor, and the one or more third inductors are connected between the signal wire and the one or more grounding plates; wherein the second capacitor is an interdigital capacitor.

9 . The multiplexer of claim 8 , wherein

the first resonant unit comprises two first capacitors and two first inductors, and the two first capacitors and the two first inductors are all symmetrically disposed with respect to the signal wire; and

the second resonant unit comprises two second inductors and two third inductors, and the first capacitor, the two second inductors, and the two third inductors are all symmetrically disposed with respect to the signal wire.

10 . A detector, comprising an antenna, an orthogonal mode coupler, a plurality of dynamic inductor thermal radiators, and a multiplexer; wherein the multiplexer comprises:

a dielectric base plate, wherein a conductive thin film layer is disposed on a side plane of the dielectric base plate, the conductive thin film layer comprises a signal wire and one or more grounding plates on a side of the signal wire, and there is one or more gaps between the signal wire and the one or more grounding plates;

a connection structure, disposed on the conductive thin film layer, and comprising a main branch and a plurality of branches, wherein the main branch is connected to the plurality of branches respectively, and the main branch serves as an input port of the multiplexer; and

a plurality of bandpass filters with different operation frequencies, wherein each of the plurality of bandpass filters is connected to the signal wire and the one or more grounding plates;

wherein each bandpass filter comprises a first port and a second port, the first port is connected to a corresponding branch respectively, and the second port serves as one of output ports of the multiplexer;

wherein the antenna is connected to the orthogonal mode coupler;

the orthogonal mode coupler is connected to an input port;

the plurality of dynamic inductor thermal radiators are respectively connected to a plurality of output ports; and

the orthogonal mode coupler, the plurality of dynamic inductor thermal radiators, and the multiplexer share one dielectric base plate.

11 . The detector of claim 10 , wherein

the plurality of branches comprises a first branch and a second branch;

the plurality of bandpass filters with different operation frequencies comprise a first bandpass filter and a second bandpass filter;

the first port of the first bandpass filter is connected to the first branch; and

the first port of the second bandpass filter is connected to the second branch.

12 . The detector of claim 10 , wherein an impedance of each branch matches an operation frequency of a bandpass filter which corresponds to the branch, and does not match an operation frequency of a bandpass filter which corresponds to other branch.

13 . The detector of claim 10 , wherein each bandpass filter comprises one or more first resonant units and one or more second resonant units;

each of the one or more first resonant units and the one or more second resonant units generates a zero point and a pole point;

the one or more first resonant units are coupled to the one or more second resonant units; and

a frequency of each of pole points is located between frequencies of zero points.

14 . The detector of claim 13 , wherein two sides of the signal wire both are provided with one or more grounding plates;

each of the one or more first resonant units and the one or more second resonant units is connected to the signal wire and the one or more grounding plates on the two sides of the signal wire, and the one or more first resonant units and the one or more second resonant units both are symmetrically disposed with respect to the signal wire.

15 . The detector of claim 13 , wherein

the one or more first resonant units are coupled to the one or more second resonant units by the signal wire; and/or

the one or more first resonant units and the one or more second resonant units are quasi-lumped resonant units.

16 . The detector of claim 13 , wherein each bandpass filter comprises two first resonant units and two second resonant units;

one first resonant unit of the two first resonant units is coupled to one second resonant unit of the two second resonant units, to form a first coupling unit;

other first resonant unit of the two first resonant units is coupled to other second resonant unit of the two second resonant units, to form a second coupling unit; and

the first coupling unit is coupled to the second coupling unit via the two first resonant units or the two second resonant units;

the first coupling unit and the second coupling unit are symmetrically disposed with respect to a coupling part between the first coupling unit and the second coupling unit; and the first coupling unit is coupled to the second coupling unit by the signal wire.

17 . The detector of claim 13 , wherein

each of the one or more first resonant units comprises one or more first capacitors and one or more first inductors; wherein the one or more first capacitors and the one or more first inductors are connected in parallel between the signal wire and the one or more grounding plates, wherein each of the one or more first capacitors is an interdigital capacitor; and

each of the one or more second resonant units comprises a second capacitor, one or more second inductors, and one or more third inductors; wherein the second capacitor is connected in series with the signal wire, the one or more second inductors are connected in parallel with the second capacitor, and the one or more third inductors are connected between the signal wire and the one or more grounding plates; wherein the second capacitor is an interdigital capacitor.

18 . The detector of claim 17 , wherein

the first resonant unit comprises two first capacitors and two first inductors, and the two first capacitors and the two first inductors are all symmetrically disposed with respect to the signal wire; and

the second resonant unit comprises two second inductors and two third inductors, and the first capacitor, the two second inductors, and the two third inductors are all symmetrically disposed with respect to the signal wire.