Question
What type of transmission line is often used for connections to MMICS?
Answer Options
- A) Miniature coax
- B) Circular waveguide
- C) Parallel wire
- D) Microstrip
Correct Answer: D
Explanation
MMICs (Monolithic Microwave Integrated Circuits) operate at frequencies where standard PCB traces and even miniature coaxial cable exhibit excessive loss and parasitic effects. For optimal high-frequency performance, the connections must maintain a precise characteristic impedance and minimize reflections.
Microstrip is the type of transmission line most often used for connections to MMICs. A microstrip line is essentially a precision copper trace on the surface of a printed circuit board, separated from a ground plane layer below by the board’s dielectric material. The width and thickness of the trace are precisely controlled to create a 50 \Omega characteristic impedance, allowing MMIC inputs and outputs to be matched directly to the interconnecting trace.
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