Microstrip transformer apparatus
First Claim
Patent Images
1. A planar transmission line structure comprising:
- a substrate;
a first serpentine transmission line located on a top surface of said substrate;
a second serpentine transmission line intertwined with and crossing said first line at given points with said second line electrically isolated from said first line at said points of crossing;
at least a third transmission line intertwined with said first and second lines and physically crossing said lines and isolated therefrom at said crossings;
isolation means located at said points of crossing between said lines to physically isolate said lines from one another at each of said points of crossing;
terminal means coupled to said first and second lines adapted to enable said lines to receive an RF signal; and
means coupled to said first, second and third lines to provide a trifilar transformer operation.
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Abstract
A transmission line structure operates as a transformer and includes at least two intertwined serpentine planar transmission lines positioned on a substrate with the lines repeatedly crossing each other with said areas of crossing including an airbridge or other structure which physically isolates one line from the other.
30 Citations
8 Claims
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1. A planar transmission line structure comprising:
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a substrate; a first serpentine transmission line located on a top surface of said substrate; a second serpentine transmission line intertwined with and crossing said first line at given points with said second line electrically isolated from said first line at said points of crossing; at least a third transmission line intertwined with said first and second lines and physically crossing said lines and isolated therefrom at said crossings; isolation means located at said points of crossing between said lines to physically isolate said lines from one another at each of said points of crossing; terminal means coupled to said first and second lines adapted to enable said lines to receive an RF signal; and means coupled to said first, second and third lines to provide a trifilar transformer operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification