Directional coupler
AssigneeMurata Manufacturing Co., Ltd.
InventorsNaoki Iida, Masahiko Kawaguchi
Life of this patent
Estimating the term…
Abstract
A directional coupling device includes a main line and a sub line, and line coupling (distributed constant coupling) is effected between the main line and the sub line, each of which has a portion that is arranged substantially parallel to each other and alongside each other. The sub line is longer than the main line. The main line is a substantially straight line or a substantially straight line bending at a predetermined position, i.e., a non-spiraling line, and the sub line is arranged to circle in a spiral manner by bending a substantially straight line at predetermined positions. Thus, a small high-capability directional coupler has excellent isolation properties and directivity, and little insertion loss or deterioration in reflection properties.
Claims11
A directional coupling device comprising:
- a main line;
- and
- a sub line;
- wherein at least a portion of the main line and the sub line are substantially parallel with each other such that line coupling is effected between the main line and sub line, and the line length of said sub line is longer than the line length of said main line.
Dependencies are inferred from the claim text.