Radio frequency transformer
AssigneeMotorola, Inc.
InventorRichard C. Li
Life of this patent
Estimating the term…
Abstract
A transformer (100)includes a substrate (101) on which two substantially adjacent runners (124 and 126) are disposed. The two runners (124 and 126) have substantially the same width and the same length and run from one segment of the substrate to another forming two spirals. The spirals run in opposite directions thereby capturing the flux and preventing it from escaping from the substrate hence adding to the efficiency of the electromagnetic coupling. The insertion loss of the transformer (100) is minimized by the high dielectric constant of the substrate, the close proximity of the two runners (124 and 126), and the opposite direction of the two loops.
Claims16
A transformer having an insertion loss, comprising:
- a substantially flat substrate of electrically insulating material having a major surface;
- first and second substantially adjacent runners disposed on the major surface, each runner forms a coil of the transformer and includes first and second terminals, the runners are looped to substantially form a first intertwined spiral on a first segment of the major surface and a second intertwined spiral on a second segment of the major surface, the first and second spirals are looped in opposite directions to minimize the insertion loss;
- an input port coupled to the first and second terminals of the first runner;
- and
- an output port coupled to the first and second terminals of the second runner.
A double-line radio frequency balun transformer, comprising:
- a substantially flat dielectric substrate having a top and a bottom surface;
- a plurality of adjacent runners disposed on the top surface of the dielectric substrate to form a plurality of intertwined spirals looped in .opposite directions each runner includes first and second ends;
- an input terminal coupled to the first end of the adjacent runners;
- and
- an output terminal coupled to the second end of the adjacent runners.
A radio communication device, comprising:
- an antenna;
- a transmitter for transmitting a radio frequency signal and including an amplifier, the amplifier including a transformer for coupling an amplified signal to the antenna, the transformer having an insertion loss and comprising:
- a substantially flat substrate of electrically insulating material having a major surface;
- and
- at least two substantially adjacent runners disposed on the first major surface, each runner having first and second terminals, the runners are looped to substantially form a first spiral on a first segment of the major surface and a second spiral on a second segment of the major surface, the first and second spirals are looped in opposite directions to minimize the insertion loss.
Dependencies are inferred from the claim text.