Turnable passive phase shifter

A system for shifting phases of signals, the system comprising:

• a multi-band phase shifter including:
• a first port;
• a second port;
• an inductive path coupled between the first port and the second port;
• the inductive path including multiple nodes comprising a first pair of nodes and a second pair of nodes;
• the inductive path including multiple inductors coupled together in series and interleaved with the multiple nodes;
• each node of the second pair of nodes positioned between two inductors of the multiple inductors;
• and
• bypass means for switching a frequency band to which the multi-band phase shifter is tuned, the bypass means coupled to the second pair of nodes and configured to selectively enable a signal detour around a portion of the multiple inductors.

A method for operating a tunable passive phase shifter, the method comprising:

• responsive to a band indication signal corresponding to a first frequency band, propagating a signal through at least four inductors coupled together in series between a first port and a second port of the tunable passive phase shifter;
• and
• responsive to the band indication signal corresponding to a second frequency band,
• closing a bypass switch to bypass at least two inductors of the at least four inductors;
• and
• propagating a signal between the first port and the second port by:
• detouring the signal around the at least two inductors;
• and
• routing the signal through multiple remaining inductors of the at least four inductors.

An apparatus for phase shifting, the apparatus comprising:

• a phase shifter including:
• multiple ports including a first port and a second port;
• multiple nodes including a first node, a second node, a third node, a fourth node, and a tap node;
• the first node coupled to the first port, and the second node coupled to the second port;
• multiple inductors including a first inductor, a second inductor, a third inductor, and a fourth inductor,
• the first inductor coupled between the first node and the third node;
• the third inductor coupled between the third node and the tap node;
• the fourth inductor coupled between the tap node and the fourth node;
• and
• the second inductor coupled between the fourth node and the second node;
• and
• a bypass path coupled to the third node and the fourth node, the bypass path including a bypass switch.