When the length of an antenna is much greater than its wavelength, it is known as a "long wire" or "long-wire antenna." These types of antennas are commonly used in radio communication and have various practical applications. Here are a few examples:
Beverage Antenna: The Beverage antenna is a type of wire antenna that is several wavelengths long. It is used for receiving low-frequency radio signals, typically in the range of 160 to 30 meters. The Beverage antenna is known for its directional properties and excellent performance in the reception of weak signals.
Rhombic Antenna: The rhombic antenna is a diamond-shaped wire antenna that is significantly longer than its operating wavelength. It is used for long-range HF (high-frequency) communication, particularly in point-to-point links over very long distances. Rhombic antennas are known for their high gain and narrow beamwidth.
V-Antenna: The V-antenna is a long-wire antenna in the shape of an inverted "V." It consists of two angled wires connected to a center feed point. This type of antenna is often used in portable or emergency communications due to its simplicity and ease of setup. V-antennas can be constructed with lengths much greater than the operating wavelength.
T2FD (Tilted Terminated Folded Dipole) Antenna: The T2FD antenna is a wideband antenna that is typically several wavelengths long. It is designed for frequency ranges from the medium-wave broadcast band up to HF frequencies. The T2FD antenna is known for its broad frequency response, low noise characteristics, and ability to operate over a wide frequency range.
Long-Wire Antenna: The generic term "long-wire antenna" refers to a simple wire antenna that is much longer than the wavelength. It is one of the simplest and oldest forms of wire antennas. Long-wire antennas can be used for receiving and transmitting signals across a wide range of frequencies, including HF and lower VHF bands.
These are just a few examples of antennas that have lengths much greater than their wavelengths. Each type of antenna has its own characteristics and applications, and they are often used in specific radio communication scenarios where their unique properties provide advantages.