High-performance dual-band Doherty power amplifier and non-uniform circularly polarized antenna array require impedancetransforming unequal dual-band 90◦ branch-line couplers for power dividing and phase shifting in the feed networks. In this paper, an analytical design methodology of generalized impedance-transforming dual-band branch-line couplers for arbitrary coupling levels is proposed. Th...

The bERLinPro project [1], under construction at HZB, is a 100 mA, 50 MeV superconducting RF (SRF) energy recovery linac (ERL) being built to study the accelerator technology and physics of operating a high current SRF ERL. For this high current operation, coaxial RF power couplers capable of handling 115 kW of power (per coupler, dual couplers per cavity), continuous wave (cw) at 1.3 GHz are r...

We propose an exactly solvable model of soliton-based pulse control that describes the physically important situation when the soliton period is much longer than the length of the coupling region in a nonlinear fiber coupler. This case can occur, e.g., in fused-fiber couplers. We demonstrate that the problem of soliton interaction and switching in such a coupler can be reduced to a linear relat...

In this paper, some hidden aspects of composite right-/left-handed (CRLH) transmission lines (TLs) and couplers are clarified. Complete detailed dispersion analysis an isolated CRLH TL is presented including lossless lossy cases based on a conventional unit cell, devised formerly. Dispersion TLs extended form the to accurate cell. Capability consisting such cells in supporting RLH waves demonst...