Loaded lange coupler
AssigneePacific Monolithics
InventorsAllen F. Podell, Ravi Ramachandran
Life of this patent
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Abstract
A loaded Lange coupler embodied as an integrated circuit includes interdigitated strip conductors and lumped-element capacitors. The two interdigitated strip conductors couple the input and direct ports together, and the isolated and coupled ports together. A capacitor extends between each of the input and coupled ports and the isolated and direct ports. Further, a capacitor extends between each of the midpoints of the strip conductors and ground. This coupler is formed as an integrated circuit in which the current-to-ground capacitors are substantially in line between opposite port pairs and the strip conductors extend around these capacitors.
Claims8
A quadrature coupler comprising:
- input, direct, coupled and isolated ports;
- a first strip conductor coupling the input and direct ports;
- a second strip conductor coupling the isolated and coupled ports;
- first capacitor means coupled between the input and coupled ports;
- second capacitor means coupled between the direct and isolated ports;
- third capacitor means coupled between an intermediate point of the first strip conductor and a reference voltage;
- and
- fourth capacitor means coupled between an intermediate point of the second strip conductor and the reference voltage.
A quadrature coupler comprising:
- input, direct, coupled and isolated ports;
- a first strip conductor coupling the input and direct ports;
- a second strip conductor coupling the isolated and coupled ports;
- first capacitor means coupled between an intermediate point of the first strip conductor and a reference voltage;
- and
- second capacitor means coupled between an intermediate point of the second strip conductor and the reference voltage.
Dependencies are inferred from the claim text.