Compact broadband impedance transformer
View Patent ↗In various embodiments, a broadband matching circuit is disclosed. In one embodiment. the broadband matching circuit comprises a low-pass matching section, a quarter-wavelength transformer, and a high-pass matching section.
1. A broadband matching circuit, comprising:
a low-pass matching section having an output;
a quarter-wavelength transformer having an input and an output; and
a high-pass matching section having an input, wherein the low-pass matching section and the high-pass matching section are in signal communication with the quarter-wavelength transformer; and
wherein the output of the low-pass matching section is coupled to the input of the quarter-wavelength transformer; and
wherein the output of the quarter-wavelength transformer is coupled to the input of the high-pass matching section.
2. The broadband matching circuit of claim 1 , wherein the broadband matching circuit is coupled to a communications system.
3. The broadband matching circuit of claim 2 , wherein the low-pass matching section is coupled to a 50 ohm source and the high-pass matching section is coupled to an output.
4. The broadband matching circuit of claim 2 , wherein the high-pass matching section is coupled to a 50 ohm source and the low-pass matching section is coupled to an output.
5. The broadband matching circuit of claim 1 , wherein the low-pass matching section comprises at least one microwave transmission line.
6. The broadband matching circuit of claim 5 , comprising:
a microwave transmission line;
a microwave transmission line T junction in signal communication with the microwave transmission line; and
an open ended stub in signal communication with the microwave transmission line T junction.
7. The broadband matching circuit of claim 1 , wherein the high-pass matching section comprises:
a capacitor; and
at least one microwave transmission line in signal communication with the capacitor.
8. The broadband matching circuit of claim 7 , wherein the at least one microwave transmission line comprises a shorted stub.
9. The broadband matching circuit of claim 1 , wherein the quarter-wavelength transformer comprises a microwave transmission line.
10. A radiofrequency (RF) communication system comprising:
a signal source;
a broadband matching circuit in signal communication with the signal source, the broadband matching circuit comprising:
a low-pass matching section having an output;
a quarter-wavelength transformer having an input and an output, the quarter-wavelength transformer in signal communication with the low-pass matching section; and
a high-pass matching section having an input, the high-pass matching section in signal communication with the quarter-wavelength transformer; and
a RF transmitter in signal communication with the broadband matching circuit; and
wherein the output of the low-pass matching section is coupled to the input of the quarter-wavelength transformer; and
wherein the output of the quarter-wavelength transformer is coupled to the input of the high-pass matching section.
11. The broadband matching circuit of claim 10 , wherein the low-pass matching section comprises at least one microwave transmission line.
12. The broadband matching circuit of claim 11 , comprising:
a microwave transmission line;
a microwave transmission line T junction in signal communication with the microwave transmission line; and
an open ended stub in signal communication with the microwave transmission line T junction.
13. The broadband matching circuit of claim 10 , wherein the high-pass matching section comprises:
a capacitor; and
at least one microwave transmission line in signal communication with the capacitor.
14. The broadband matching circuit of claim 13 , wherein the at least one microwave transmission line comprises a shorted stub.
15. The broadband matching circuit of claim 10 , wherein the quarter-wavelength transformer comprises a microwave transmission line.
16. A radiofrequency (RF) communication system comprising:
a RF receiver;
a broadband matching circuit in signal communication with the receiver, the broadband matching circuit comprising:
a low-pass matching section having an output, the low-pass matching section in signal communication with the quarter-wavelength transformer;
a quarter-wavelength transformer having an input and an output, the quarter-wavelength transformer in signal communication with the a high-pass matching section; and
a high-pass matching section having an input; and
a signal output in signal communication with the broadband matching circuit; and
wherein the output of the low-pass matching section is coupled to the input of the quarter-wavelength transformer; and
wherein the output of the quarter-wavelength transformer is coupled to the input of the high-pass matching section.
17. The broadband matching circuit of claim 16 , wherein the low-pass matching section comprises at least one microwave transmission line.
18. The broadband matching circuit of claim 17 , comprising:
a microwave transmission line;
a microwave transmission line T junction in signal communication with the microwave transmission line; and
an open ended stub in signal communication with the microwave transmission line T junction.
19. The broadband matching circuit of claim 16 , wherein the high-pass matching section comprises:
a capacitor; and
at least one microwave transmission line in signal communication with the capacitor.
20. The broadband matching circuit of claim 16 , wherein the quarter-wavelength transformer comprises a microwave transmission line.