PHASE SHIFT SERIES
PHASE SHIFT FREE

MEMS phase shifters (proceed with caution.) Other Microwaves101 phase shifter pages include: An important characteristic of phase shifters (We recommend that you read this first!) Types of phase shifters

PHASE SHIFT FREE

This collection of material is easily the best free phase shifter resource on the planet, and it keeps getting better.Ĭheck out the Phase Shifter Search Tool (on everything RF) if you are looking to buy a phase shifter. Hey, that almost sounds like they are paying us for an advertisement!īelow is an outline of all of our material on phase shifters. Engineers generally live a lot longer than musicians, which allows the IEEE to offer lower life insurance premiums to members. Felsenheld was a graduate of Lafayette College, and went on to form a manufacturer's rep company he passed away in 2015. Alan Wilson (Canned Heat) died in 1970 at the age of 27 after overdosing on barbiturates. Thanks to William for asking how the capacitors might be connected. At the time there were no surface mount parts, so axial-leaded capacitors (perhaps 10 or 100 pF) would have one lead soldered to the trace, and the other going through a drilled hole in the board and soldered to the backside (with leads cut as short as possible!) It would also have been possible to make an RF ground with a quarter-wave open circuit stub to avoid having to drill a hole. These capacitors need to be grounded to form RF grounds that choke off the signal from escaping out the control lines. One funny thing about the image is that the draftsman did not understand that capacitors C6, C7, C8 and C9 must be in shunt with the diode DC bias lines, not in series.

It probably provides more of a true time delay than a constant phase shift over frequency, but you would have to analyze what the loading effects of path ACB are on the main path when diodes CR1 and CR8 are switched in.

PHASE SHIFT SERIES

The phase shifter is a four-bit digital unit, using switched series lines. What's left of ITT Nutley is now part of Harris, if you like to keep track of old nameplates. While others were at Woodstock skinny-dipping and watching Canned Heat's Alan Wilson croak out 'Going up the Country', Felsenheld was working at ITT in Nutley, New Jersey and writing up this patent.

The figure above shows a microstrip phase shifter, circa 1969, invented by Robert Felsenheld. Click here to learn the tradeoff between TDUs and phase shifters (new for May 2019!)

Phase shift