# 1/4 wave monopole PCB antenna design

1. I followed the below procedure to design a 700MHz 1/4 wave monopole PCB antenna.

Is this correct?

  a. The trace length decided to match with Wavelength of the frequency

Wavelength (Lambda) = Wave Velocity (v) / Frequency (f)

=299792458 /700000000
=428.2/4
=107mm
So, the trace length =107mm.

b.Trace width decided by microstrip 50 ohm impedance matching calculation


So, the trace width =51.9mils

1. How to decide the gap between two trace line? Is there any calculation?