Loop Antennas vs. B-Probes: Similarities and Differences

In summary, the difference between a loop antenna and a magnetic probe (B-Probe) lies in the external circuit and the flow of energy. While a loop antenna maximizes power extraction from the magnetic field, a B-probe minimizes its influence on the field by sensing induced voltage and minimizing current. It's worth noting that there are two types of B-field probes - a simple coil for sensing AC fields and a Hall Effect sensor for both DC and AC fields.
  • #1
Massi
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Hi
the difference between a loop antenna and a magnetic probe (B-Probe) is only that the loop antenna works in far field and B-Probe works in near field? The standard features of magnetic antenna (antenna factor, impedance matching, radiation patterns, efficiency, ecc) have the same definition in the case of the B-Probe?
Thanks !
Regards
Massi
 
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  • #2
Welcome to PF.
A loop antenna and a B-probe differ in the external circuit and so in the flow of energy.
The loop antenna extracts the maximum power from the magnetic field and so significantly distorts the local field.
The B-probe senses the voltage induced on the loop, while minimising the current. That reduces the influence of the probe on the field.
 
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  • #3
Thank you!
 
  • #4
Massi said:
Hi
the difference between a loop antenna and a magnetic probe (B-Probe) is only that the loop antenna works in far field and B-Probe works in near field? The standard features of magnetic antenna (antenna factor, impedance matching, radiation patterns, efficiency, ecc) have the same definition in the case of the B-Probe?
Thanks !
Regards
Massi
Welcome to the PF.

In addition to Baluncore's comments, keep in mind that there are two different kinds of B-Field probes. The simplest is a small coil that is used to sense AC magnetic fields. It may be a single turn, shielded loop probe, or it can also consist of a number of turns for higher sensitivity (at the expense of lower bandwidth). But to sense DC and AC magnetic fields, a Hall Effect sensor is generally used. Does that make sense?
 
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ok I see, thank you!
massi
 

1. What is a B-Probe and loop antenna?

A B-Probe and loop antenna is a type of antenna commonly used in radio frequency (RF) and electromagnetic field (EMF) measurements. It consists of a loop-shaped antenna and a small probe that is inserted into the center of the loop. This design allows for efficient measurement of magnetic fields in a specific direction.

2. How does a B-Probe and loop antenna work?

The loop antenna picks up magnetic fields and induces an electric current in the probe. This current is then measured and used to determine the strength and direction of the magnetic field. The probe acts as a directional antenna, allowing for more accurate measurements in a specific direction.

3. What are the advantages of using a B-Probe and loop antenna?

One major advantage of this type of antenna is its ability to measure magnetic fields in a specific direction, making it useful for pinpointing the source of the field. It is also relatively compact and can be easily moved and adjusted for different measurement scenarios. Additionally, it has a broad frequency range and can be used for both low and high frequency measurements.

4. What are the limitations of a B-Probe and loop antenna?

One limitation is that it can only measure magnetic fields and is not suitable for measuring electric fields. Additionally, its accuracy may be affected by the distance between the probe and the source of the field. It also has a limited range of measurement, typically up to a few meters.

5. How is a B-Probe and loop antenna used in scientific research?

B-Probes and loop antennas are commonly used in scientific research to measure and study magnetic fields. They can be used in various fields such as physics, engineering, and environmental studies. They are particularly useful in studying electromagnetic fields and their effects on living organisms. They are also used in the development and testing of electronic devices and equipment.

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