Designing a 50-ohm RO4350B microstrip
A 50-ohm trace width depends on dielectric height, design Dk, conductor thickness, solder mask and neighboring copper
DESIGN
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Move from a material choice to a defensible RF layout and stackup.
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20 topics
75-ohm transmission lines on RO4350B
For a fixed substrate and dielectric constant, a 75-ohm microstrip is narrower than a 50-ohm line
RO4350B microstrip layout fundamentals
A microstrip places a signal conductor above a reference plane with fields distributed between the dielectric and the region above the board
RO4350B stripline: when to use buried RF routing
Stripline routes a signal between reference planes
Grounded coplanar waveguide on RO4350B
Grounded coplanar waveguide depends on trace width, side gaps, substrate height, conductor thickness and grounding structure
A 2-layer RO4350B RF stackup
A common two-layer concept uses an RF signal layer, a RO4350B core and a ground plane
Planning a 4-layer RO4350B hybrid stackup
A four-layer hybrid can place the RF path over a RO4350B dielectric while using other materials for less sensitive functions
RO4350B 6-layer stackup planning
Six layers can separate RF routing, reference planes, power distribution and digital signals
RO4350B and FR-4 hybrid stackups
Hybrid construction can reserve RF material for critical fields while using another laminate elsewhere
Ground return paths in a RO4350B layout
A controlled-impedance line needs a controlled return path
Choosing RF via-fence spacing on RO4350B
Via fences can help control fields and ground continuity, but spacing is a design variable tied to guided wavelength, geometry and mode behavior
SMA and edge-launch transitions on RO4350B
The connector-to-PCB transition is a three-dimensional RF structure
Via stubs and layer transitions
Unused via barrels can create resonant structures
Copper roughness in a RO4350B loss budget
Copper surface profile can increase conductor loss and influence electrical behavior at high frequency
Solder mask over RO4350B RF traces
Solder mask changes the dielectric environment above a microstrip and can affect impedance and loss
Phase matching RO4350B transmission lines
Equal physical length does not always mean equal electrical length
Building a RO4350B insertion-loss budget
Total insertion loss includes conductor and dielectric attenuation, mismatch, launches, vias and components
Starting a RO4350B patch-antenna design
A rectangular patch estimate is only the beginning of an antenna design
RO4350B distributed-filter layout
Distributed filters use geometry and coupling as circuit elements
RO4350B design-release checklist
A design is ready for fabrication when its electrical intent can be translated into a clear, manufacturable construction
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