Abstract
Concepts for ceramic integrated transmission line transformers (TLT) to conduct powers up to some kW and currents up to 10 A with an impedance ratio of 4:1 are presented. In this power range, a TLT usually consists of coaxial cables. To optimize size, improve integrability and enhance electric performance, our work pursues the integration into a planar multilayer board with electroplated conductors using Low Temperature Cofired Ceramics Technology (LTCC). The methodical design approach is presented, using complementary simulation tools for circuit, multilayer and FEM analysis to reach the aforementioned application-specific performance. Size is reduced further using specific ferrites and optimizing their position. The correlation between measured characteristics of various transmission line transformers produced and underlying design considerations are given in detail. Minimum sizes of 10 to 15 mm squared have been realized using single sided metallisation, which is also well suited for electroplating.
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