Flexible microwave transmission line
A power amplifier (power amplifier) having multiple solid state sub-amplifiers connected in parallel between the power amplifier input and the power amplifier output are described. The signal input to the power amplifier is provided to an RF splitter connected between the power amplifier input connector and the input of each of the sub-amplifiers. The RF splitter splits the input power from the signal input and provides the power to the sub-amplifier inputs through input electrical paths. The input electrical paths from the power amplifier input to the sub-amplifiers are substantially physically identical. Each of the sub-amplifiers drive an input of an RF combiner connected between the outputs of the sub-amplifiers and the output of the power amplifier. The RF combiner combines the output power from each of the sub-amplifiers through output electrical paths, and provides the combined power to the power amplifier output. The output electrical paths from the sub-amplifiers to the power amplifier output are substantially physically identical.
1. A transmission line component for an RF power amplifier, comprising:
a flexible first substrate; and
a first conductor on the first substrate, the first conductor configured to provide an insertion loss of less than about 0.2 dB when the flexible substrate has a bend of about 90 degrees with a radius of curvature less than about ⅛ inch.
2. The component of claim 1 , wherein the first flexible substrate is substantially planar when the first flexible substrate is substantially straight.
3. The component of claim 1 , wherein the flexible substrate comprises a flexible laminate.
4. The component of claim 1 , wherein the first conductor comprises copper.
5. The component of claim 1 , wherein the first conductor is coated with teflon.
6. The component of claim 1 , further comprising:
a second substrate mechanically connected to the first substrate with a first connector; and
a second conductor on the second substrate, the second conductor electrically and mechanically connected to the first conductor with a second connector,
wherein the first and second connectors provide an electrical matching network between the first and second conductors.
7. The component of claim 6 , wherein the first connector comprises a screw.
8. The component of claim 6 , wherein the second connector comprises a third conductor attached to the first and second conductors.
9. The component of claim 6 , wherein the electrical matching network comprises a series inductor and a parallel capacitor.
10. The component of claim 9 , wherein the series inductor has an inductance less than 0.05 nH.
11. The component of claim 9 , wherein the series inductor comprises at least a portion of the second connector.
12. The component of claim 9 , wherein the capacitor comprises at least a portion of the first connector.
13. The component of claim 1 , further comprising:
a second substrate mechanically connected to the first substrate with a first connector; and
a second conductor on the second substrate, the second conductor electrically and mechanically connected to the first conductor with a second connector,
wherein the first and second connectors provide a substantially coplanar interface between the first and second conductors.
14. The component of claim 13 , wherein the first connector comprises a screw.
15. The component of claim 13 , wherein the second connector comprises a third conductor attached to the first and second conductors.
16. The component of claim 13 , wherein the first and second connectors provide an electrical matching network between the first and second conductors.
17. The component of claim 13 , wherein the electrical matching network comprises a series inductor and a parallel capacitor.
18. The component of claim 17 , wherein the inductance is less than 0.05 nH.
19. The component of claim 17 , wherein inductor comprises at least a portion of the second connector.
20. The component of claim 17 , wherein the capacitor comprises at least a portion of the first connector.