In open space, infinitely far from material objects, the radiation pattern of a half-wave
dipole is a torus (donut), with the radiator (wire) passing straight through the center
of the hole. The field strength is maximum in all directions perpendicular to the wire,
and zero in the directions off the ends of the wire. The peak field strength is +2.2 dB
relative to isotropic.
The half-wave dipole antenna has several disadvantages, including its limited bandwidth, which can restrict its effectiveness across a range of frequencies. Additionally, it has a relatively low gain compared to other types of antennas, making it less effective for long-distance communication. The dipole's radiation pattern can also lead to blind spots, limiting its directional capabilities. Lastly, it requires a specific length to function optimally, which may not be practical in all installation scenarios.
The radiation resistance of a folded dipole antenna is typically higher than that of a simple dipole antenna, approximately 300 ohms compared to 73 ohms. This increase in radiation resistance helps improve the efficiency and performance of the antenna. The folded design allows for a more compact structure while maintaining good radiation characteristics.
A molecule is considered microwave active if it has a net dipole moment resulting from the uneven distribution of charges within the molecule. This uneven distribution causes the molecule to rotate and absorb microwave radiation. In contrast, molecules that are symmetric and have a zero net dipole moment are considered microwave inactive because they do not interact with microwave radiation.
You can view incident IR radiation as an oscillating electric field ( the 'wave-like' view of EM radiation.) As such, it effects the vibration of a molecule by inducing a dipole oscillation of the same frequency. The connection is most clearly seen if you consider that the induced dipole oscillation produces an identical oscillating electric field to the field that induced it. A molecule can only produce an oscillating electric field by vibration if its vibration produces a change in dipole moment (a non-polar molecule would produce a constant electric field regardless of the vibration.) I hope that helps
Long wave radiation in the form of infrared waves. These can be seen with an infrared camera.
The radiation resistance of a half-wave folded dipole is typically around 300 ohms. This value is higher compared to a regular half-wave dipole due to the increased current distribution along the folded elements.
It's a torus.
effective height of half wave dipole antenna
The half-wave dipole antenna has several disadvantages, including its limited bandwidth, which can restrict its effectiveness across a range of frequencies. Additionally, it has a relatively low gain compared to other types of antennas, making it less effective for long-distance communication. The dipole's radiation pattern can also lead to blind spots, limiting its directional capabilities. Lastly, it requires a specific length to function optimally, which may not be practical in all installation scenarios.
EM radiation is short for electromagnetic radiation. It is a wave in the electric and magnetic fields.EM radiation is short for electromagnetic radiation. It is a wave in the electric and magnetic fields.EM radiation is short for electromagnetic radiation. It is a wave in the electric and magnetic fields.EM radiation is short for electromagnetic radiation. It is a wave in the electric and magnetic fields.
-- Long-wave radiation -- Medium-wave radiation -- Short-wave radiation
Radio wave + radio wave will make radiation.
OK
EM radiation is short for electromagnetic radiation. It is a wave in the electric and magnetic fields.EM radiation is short for electromagnetic radiation. It is a wave in the electric and magnetic fields.EM radiation is short for electromagnetic radiation. It is a wave in the electric and magnetic fields.EM radiation is short for electromagnetic radiation. It is a wave in the electric and magnetic fields.
Yes, electromagnetic radiation does travel as a transverse wave
Yes, electromagnetic radiation does travel as a transverse wave
The radiation resistance of a folded dipole antenna is typically higher than that of a simple dipole antenna, approximately 300 ohms compared to 73 ohms. This increase in radiation resistance helps improve the efficiency and performance of the antenna. The folded design allows for a more compact structure while maintaining good radiation characteristics.