Laminated balun transformer
First Claim
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1. A laminated balun transformer comprising:
- a stack in which, at least a pair of balanced transmission lines, an unbalanced transmission line that is electromagnetically coupled with the pair of balanced transmission lines, a shield electrode that opposes at least one of the balanced transmission lines and the unbalanced transmission line, and a plurality of dielectric layers are stacked;
a ground terminal that is provided on a surface of the stack and that is electrically connected to the balanced transmission lines; and
a shield terminal that is provided on a surface of the stack and that is electrically connected to the shield electrode;
wherein the ground terminal and the shield terminal are electrically independent of each other.
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Abstract
A laminated balun transformer includes first line elements which are connected in series through a relay terminal, to constitute an unbalanced transmission line. Other line elements each constitute a balanced transmission lines. Strip lines are electromagnetically coupled to constitute a coupler. Similarly, other line elements are electromagnetically coupled to constitute a coupler. A ground terminal is connected to the balanced transmission lines, which are constituted by a pair of the line elements. Meanwhile, a shield terminal is connected to leading portions of shield electrodes. These two terminals are electrically independent of each other.
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Citations
21 Claims
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1. A laminated balun transformer comprising:
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a stack in which, at least a pair of balanced transmission lines, an unbalanced transmission line that is electromagnetically coupled with the pair of balanced transmission lines, a shield electrode that opposes at least one of the balanced transmission lines and the unbalanced transmission line, and a plurality of dielectric layers are stacked;
a ground terminal that is provided on a surface of the stack and that is electrically connected to the balanced transmission lines; and
a shield terminal that is provided on a surface of the stack and that is electrically connected to the shield electrode;
wherein the ground terminal and the shield terminal are electrically independent of each other. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A laminated balun transformer comprising:
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a pair of balanced transmission lines;
an unbalanced transmission line that is electromagnetically coupled with the pair of balanced transmission lines;
an unbalanced signal terminal that is electrically connected to one end of the unbalanced transmission line;
two balanced signal terminals, each of the two balanced signal terminals being electrically connected to one end of a corresponding one of the pair of balanced transmission lines;
a common bias terminal that is electrically connected to the other ends of the pair of balanced transmission lines; and
a bias capacitor that is electrically connected between the common bias terminal and ground. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A laminated balun transformer comprising:
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a stack in which, at least a pair of balanced transmission lines, an unbalanced transmission line that is electromagnetically coupled with the pair of balanced transmission lines, a shield electrode that opposes at least one of the pair of balanced transmission lines and the unbalanced transmission line, a pair of bias-capacitor patterns, and a plurality of dielectric layers are stacked;
a common bias terminal that is provided on a surface of the stack and that is electrically connected to the balanced transmission lines and one of the pair of bias-capacitor patterns; and
a shield terminal that is provided on a surface of the stack and that is electrically connected to the shield electrode and the other of the pair of bias-capacitor patterns;
wherein the common bias terminal and the shield terminal are electrically independent of each other. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification