What is the difference between a ½-wave and a ¼-wave antenna?
| Antenna Type |
½-wave |
¼-wave |
| Alternate name |
Dipole |
Monopole |
| # of elements |
2 |
1 |
| Requires ground plane? |
No |
Yes |
| Gain (dBi) |
2.1 |
1.9 |
| |
¼ wavelength |
| Frequency |
Inches |
Centimeters |
| 915 MHz |
3.1 |
8 |
| 2.4 GHz |
1.17 |
3 |
For RF applications, a 1/2 wave antenna will be more suitable compared to a 1/4 wave antenna due to following reasons:
- No Ground plane is required for 1/2 wave antenna while its required for 1/4 wave antenna.
- More energy will be transmitted horizontally in 1/2 wave antenna compared to 1/4 wave antenna.
- Half wave antenna will be taller is size and would therefore be able to avoid more obstacles than quarter wave antenna.
Poor Earth Considerations:
Poor earth generally leads to higher take-off angles and signal loss. While a 1/2 wave antenna might be slightly less affected than a 1/4 wave antenna, both can benefit from measures to improve ground conductivity, such as adding ground radials.
Last updated:
Feb 06, 2025