14 dBi panel antenna
This antenna consists of array of 4 dipoles over the aluminium reflector. Most
commercial panel antennas are microstrip patch antennas. See this photo for example. NEC2 is not suitable for simulating of such
software's IE3D full-wave electromagnetic simulator is ideal for the design
and simulation of patch antennas.
Figure 1 - Panel antenna
Beda Hammerschmied sent me the photo of the panel antenna he constructed (see
figure 1) using my design. He reports 14 dBm improvement over DI-524 2 dBi
- Frequency range: 2412 - 2472 MHz
- Physical dimensions: 185mm x 185mm x 30mm
- Gain: 14 dBi
- Front to back ratio: 18 dB
- Half power beamwidth: 40 degrees H-plane, 30 degrees E-plane
- SWR < 1.3 (in practice adjust array height over reflector)
- 4NEC2 input file: panel_2x2.nec.txt
Schematics of the antenna - drawing by Dave Carpenter.
N-Type connector is in the middle of reflector. 4 equal length coax cables are
soldered to connector - coax core to connector core, shield to connector outer.
The cheap RG-58/U coax can be used. Solder a dipole on each coax's other end -
coax core to dipole's upper arm, shield to lower arm. Dipoles then can be fixed
in place with some posts and glue.
Two side reflectors can be added for additional 1.5 dB gain -
panel_2x2a.nec.txt. Azimuth half power beamwidth then becomes 30
Figure 2 - Elevation pattern
Figure 3 - Azimuth pattern
Figure 4 - SWR graph
Other NEC2 antenna models
- 14 dBi short-backfire -
sbfa.nec.txt. 4:1 slot-fed balun should be used to feed the dipole.
To simulate antenna with feed network
Zeland software's IE3D can be used. Search the web for construction
details of this antenna.
- 11 dBi biquad -
biquad.nec.txt. 34 dB front to back ratio, 60 degrees H-plane, 50
degrees E-plane half power beamwidth.
- 11 dBi log periodic -
lpda.nec.txt. 27 dB front to back ratio, 70 degrees H-plane, 50
degrees E-plane half power beamwidth. Feed like this is used in
California Amplifier 24 dBi parabolic grid antennas. I used this photo to model the
original California Amplifier quasi log periodic feed - lpda_calamp.nec.txt.
- 11.5 dBi helical -