Pin Feeding vs Coaxial (Cable) Feeding for Microstrip Patch Antenna
Jaehoon
Altair Employee
Altair EmployeeThis document shows the compared simulation results of the rectangular patch antenna by using two different feeding methods: Pin-fed and Coaxial-fed.
Overview of the Simulated Antenna
1) Original model: A.8 Microstrip Patch Antenna from Feko’s example guide
2) Antenna dimensions: Unit = mm, Radiator/Ground = PEC
3) Simulation frequency: 2.7 ~ 3.3 GHz
4) Simulation solver: MoM
Two Feeding Methods
1) Pin feeding
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- How to construct: Vertical line (length = substrate height, 2.87 mm)
- Port setting: Wire port
- Source setting: Voltage source (Reference impedance = 50 Ohm)
- How to construct: Vertical line (length = substrate height, 2.87 mm)
2) Coaxial (cable) feeding
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- How to construct: Two cylinders (length = 10 mm)
- Inner conductor: 0.65 mm in radius, 12.87 mm in length, PEC
- Outer conductor: 2.1 mm in radius, 10 mm in length, PEC
- Dielectric: Teflon (er= 2.1)
- Characteristic impedance: 48.5 Ohm from https://www.pasternack.com/t-calculator-coax-cutoff.aspx
- Port setting: Waveguide port
- Source setting: Waveguide source
- Watch the following video for the details.
- How to construct: Two cylinders (length = 10 mm)
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Comparison of two Reflection Coefficients
Conclusion: Simple Pin feeding can replace Realistic Coaxial feeding for microstrip patch antenna simulations.
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