In microwave communication systems, antenna gain is a key indicator for measuring radiation performance. As a professional microwave antenna supplier, we are well aware of the importance of accurately calculating and measuring antenna gain for system optimization. This article will take the 40GHz antenna and Cassegrain antenna as examples to introduce in detail the calculation method and practical points of antenna gain.
1. Theoretical calculation basis
Antenna gain (dBi) is determined by directivity and efficiency:
Gain (dBi) = directivity × efficiency
1. Directivity calculation:
Obtained by integrating the radiation pattern, high-directivity antennas (such as Cassegrain antennas) can concentrate energy in a narrow beam.
2. Efficiency considerations:
The following loss factors need to be considered:
- Feeder loss (such as waveguide load mismatch)
- Material loss
- Surface processing accuracy
2. Professional measurement methods
1. Comparative test method:
Compare the antenna under test (such as the 40GHz antenna) with the standard gain horn antenna.
2. Far-field test:
Measure the radiation pattern in a microwave darkroom, which is a professional test method commonly used by **antenna suppliers**.
3. Network analyzer test:
Evaluate the return loss and radiation efficiency through S parameter analysis.
Broadband Horn Antenna(18-40GHz)
Waveguide to Coaxial Adapter (26.5-40GHz)
Waveguide Probe Antenna(26.5-40GHz)
RFmiso 40Ghz Antenna Products
3.Simulation verification technology
Use professional electromagnetic simulation software such as HFSS and CST:
- Accurately calculate the aperture efficiency (especially critical for **Cassegrain antenna** and other reflector antennas)
- Analyze the feed alignment
- Evaluate the impact of **waveguide load**
4. Key points of engineering practice
1. Frequency characteristics:
Antenna gain has significant frequency correlation (such as the gain of a 40GHz antenna will decrease at 30GHz).
2. Environmental factors:
Installation location, surrounding interference, etc. will affect the actual gain performance.
3. Process requirements:
Precision machining ensures that the theoretical design can be realized.
Cassegrain Antenna (26.5-40GHz)
Professional advice:
For special requirements such as **40GHz antenna** in the millimeter wave band or **Cassegrain antenna** with high gain, it is recommended to cooperate with a professional **microwave antenna supplier** with complete testing capabilities to ensure product performance.
We have:
- Complete test chamber
- Professional measurement team
- Rich engineering experience
For more antenna gain optimization solutions, please feel free to contact our technical team.
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Post time: Apr-10-2025
