Two-Antenna Method for Gain Calculation

In summary, the two-antenna method is used to measure the gain of an antenna. Pozar provides a formula for this in his Antenna chapter, but it can be problematic and may require additional information about the radiation pattern and environmental conditions. It is most reliable when used with two highly directive and well-matched antennae.
  • #1
kahn
1
0
Can someone please help me understand how two-antenna method is used to measure gain of an antenna ?
I could't even find literature on it, please if anyone could even suggest any document that would also be great.

Thanks.
 
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  • #2
Pozar derives it in his Antenna chapter.
[tex]\frac{P_r}{P_t}=(\frac{\lambda}{4r\pi})^2G_rG_t[/tex]
 
  • #3
This is a highly problematical business and you can seldom be really sure of your answers until you actually start to use the antenna in a working system.
sandy.bridge said:
Pozar derives it in his Antenna chapter.
[tex]\frac{P_r}{P_t}=(\frac{\lambda}{4r\pi})^2G_rG_t[/tex]
That looks OK as a bit of theory and assumes the antennae are in free space and the test antenna has a known gain. For a practical way, you really need some indication of the radiation pattern of the antenna under test or at least to ascertain that local conditions are not affecting use of that formula.
If you are dealing with two very directive antennae (e.g.dishes) and well elevated about the ground) and if they are well matched to your test equipment then that formula would be more reliable.
 

1. What is the Two-Antenna Method for Gain Calculation?

The Two-Antenna Method is a technique used to calculate the gain of an antenna by comparing the received signal strength from a reference antenna to that of the antenna being tested.

2. How does the Two-Antenna Method work?

The Two-Antenna Method works by placing two identical antennas in a specific configuration, one acting as the reference and the other as the test antenna. A signal is then transmitted to both antennas and the received signal strengths are measured. The gain of the test antenna can then be calculated using the ratio of the two signal strengths.

3. What are the advantages of using the Two-Antenna Method for Gain Calculation?

The Two-Antenna Method offers several advantages over other methods of gain calculation. It is relatively simple and inexpensive to set up, requires minimal equipment, and can be used for a wide range of antenna types and frequencies. It also provides a more accurate measurement of the gain compared to other methods.

4. What are the limitations of the Two-Antenna Method?

While the Two-Antenna Method is a useful technique for gain calculation, it does have some limitations. The accuracy of the measurement can be affected by environmental factors such as reflections, interference, and multipath propagation. Additionally, the method may not be suitable for measuring the gain of highly directional or complex antennas.

5. Are there any alternative methods for gain calculation?

Yes, there are other methods for gain calculation such as the Three-Antenna Method, the Wheeler Cap Method, and the Spherical Near-Field Method. Each method has its own advantages and limitations, and the choice of which method to use will depend on the specific needs and requirements of the measurement. It is important to carefully consider the method and its limitations before conducting a gain calculation.

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