Wave transmission lines and networks – Coupling networks – Delay lines including long line elements
Patent
1998-03-18
2000-06-13
Lee, Benny
Wave transmission lines and networks
Coupling networks
Delay lines including long line elements
333 34, H01P 118
Patent
active
060754249
ABSTRACT:
A phase shifter including a phase-shifting slab having a phase-shifting member is used in conjunction with a quasi-TEM transmission line having at least one active line and one ground. In some embodiments, the phase-shifting slab is inserted between the active line and the ground. The phase-shifting member is advantageously configured so that as it is advanced between the active line and the ground plane, a varying amount of dielectric material passes therebetween. Varying the amount of dielectric material between the active line and the ground changes the effective dielectric constant of the transmission line. Such a change in the effective dielectric constant causes a change in the propagation velocity of a signal traveling through the transmission line. In that manner, a phase shift is introduced in the signal relative to other signals. The phase-shifting slab advantageously comprises at least one impedance-matching member that decreases or eliminates an impedance mismatch that occurs between air-suspended and dielectrically-loaded regions of the transmission line. In some embodiments, the impedance mismatch is decreased or eliminated over the entire phase-shifting range. Decreasing the impedance mismatch may advantageously reduce the incidence and severity of signal reflections.
REFERENCES:
patent: 3440573 (1969-04-01), Butler
patent: 3656179 (1972-04-01), DeLoach
patent: 5949303 (1999-09-01), Arvidsson et al.
Hampel Karl Georg
Hojell Gary M.
Lee Benny
Lucent Technologies - Inc.
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