Planar Transmission Media: Match Each Line Type to Its Name List I (Structures) A. Slotline B. Coplanar line C. Microstrip List II (Labels) Slot line Coplanar line Microstrip

Introduction / Context:
Modern RF and microwave printed-circuit technologies commonly use microstrip, coplanar, and slotline structures. Distinguishing these by geometry is essential for correct design of filters, couplers, transitions, and antenna feeds on planar substrates.

Given Data / Assumptions:

• Microstrip: signal trace on one side of a dielectric with a continuous ground plane on the opposite side.
• Coplanar line (often CPW with ground): center conductor flanked by ground planes on the same side of the dielectric, with or without a backside ground.
• Slotline: narrow slot etched in an otherwise continuous ground plane; fields concentrate across the slot.

Concept / Approach:

Match each canonical geometry to its standard name. The distinctions hinge on where the conductors and ground planes are located and where the dominant fields are confined.

Step-by-Step Solution:

Verification / Alternative check:

Field simulations and textbook cross-sections show microstrip's primarily quasi-TEM mode with fields largely between top trace and bottom ground; CPW fields split across coplanar gaps; slotline confines fields in the slot itself.

Why Other Options Are Wrong:

Swapping names confuses grounding topology and field distributions, leading to wrong impedance and radiation expectations.

Common Pitfalls:

Assuming coplanar lines always require no backside ground; in practice, CPW with ground often includes a backside ground tied by vias for shielding.

Final Answer:

A-1, B-2, C-3