WiFi antenna

From MMAE

(Redirected from WiFi Yagi)
Jump to: navigation, search

This is my ongoing project for Wifi Yagi Antennas made with the milling machine. In other words this not complete

Frequency Range: 2400MHz - 2483MHz

Contents

[edit] Center Frequency and bandwidth estimate

Band Width: 83MHz

Frequency Range with error included: 2399.88MHz - 2483.13MHz

Bottom fequency deviation with error: c / (c / F + E) = BFD = 2399.88MHz, F = 2400MHz
Top fequency deviation with error: c / (c / F − E) = TFD = 2483.13MHz, F = 2484MHz
Milling machine resolution: E = 6.35 * 106m
Speed of light: c = 2.998 * 108m / s

Band Width: TFD − BFD = 83.25Hz

Average error over frequency range: 126KHz

Center Frequency: (TFD − BFD) / 2 + BFD = 2441.63MHz

Based on the above the yagi should be built around the frequency 2441.63MHz with a bandwidth of at least 83.25MHz

[edit] Possibilities

Yagi
simple, obvious, designs available; expect 6-9db gain for 3 elements
Log periodic
greater bandwidth; expect 10-30db gain for 5-7 elements
biquad 
needs a reflector spaced correctly in 3d [1]
conical
can a pcb spiral be stretched into a cone?
colinear
high gain omni; could do colinear slots on a pcb

Cisco article on wifi antennas

[edit] Designs

[edit] Yagi Model 1

Thanks to Hao Dong for running this simulation!

PCB
31mil 0.5oz. Copper
PCB size
2in by 2.4in
Yagi elements
6
|S11|dB < -5.66dB from 2.412 to 2.484GHz
VSWR < 3.18 from 2.412 to 2.484GHz
Gain
8.089dB@2.412GHz
7.863dB@2.432GHz
7.652dB@2.452GHz
7.535dB@2.472GHz
7.531dB@2.484GHz

[edit] See also

[edit] External Links

Retrieved from "http://www2.mmae.ucf.edu/wiki/WiFi_antenna"
Personal tools