Беверідж антеннасы: қашықтан қабылдау үшін бағытталған сым антеннасы

Type of radio antenna

The Beverage antenna or "wave antenna" is a long wire receiving antenna mainly used in the low frequency and medium frequency radio bands, invented by Harold H. Beverage in 1921. It is used by amateur radio operators, shortwave listeners, longwave radio DXers and for military applications. A Beverage antenna consists of a horizontal wire from one half to several wavelengths long (tens to hundreds of meters; yards at HF to several kilometres; miles for longwave) suspended above the ground, with the feedline to the receiver attached to one end, and the other end of the wire terminated through a resistor to ground. The antenna has a unidirectional radiation pattern with the main lobe of the pattern at a shallow angle into the sky off the resistor terminated end, making it ideal for reception of long distance skywave (skip) transmissions from stations over the horizon which reflect off the ionosphere. However the antenna must be built so the wire points in the direction of the transmitter(s) to be received. The advantages of the Beverage are excellent directivity, a wider bandwidth than resonant antennas, and a strong ability to receive distant and overseas transmitters. Its disadvantages are its physical size, requiring considerable land area, and inability to rotate to change the direction of reception. Installations often use multiple Beverage antennas to provide wide azimuth coverage.

Harold Beverage experimented with receiving antennas similar to the Beverage antenna in 1919 at the Otter Cliffs Radio Station. He discovered in 1920 that an otherwise nearly bidirectional long wire antenna becomes unidirectional by placing it close to the lossy earth and by terminating one end of the wire with a resistor. In 1921, Beverage was granted a patent for his antenna. That year, Beverage long wave receiving antennas up to 9 mile (14 km) long had been installed at RCA's Riverhead, New York, Belfast, Maine, Belmar, New Jersey, and Chatham, Massachusetts receiver stations for transatlantic radiotelegraphy traffic. Perhaps the largest Beverage antenna—an array of four phased Beverages 3 mile (5 km) long and 2 mile (3 km) wide—was built by AT&T in Houlton, Maine, for the first transatlantic telephone system opened in 1927.

While Beverage antennas have excellent directivity, because they are close to lossy Earth, they do not produce absolute gain; their gain is typically from −20 to −10 dBi. This is rarely a problem, because the antenna is used at frequencies where there are high levels of atmospheric radio noise. At these frequencies the atmospheric noise, and not receiver noise, determines the signal to noise ratio, so an inefficient antenna can be used. The weak signal from the antenna can be amplified in the receiver without introducing significant noise. The antenna is not used as a transmitting antenna since, to do so, would mean a large portion of the drive power is wasted in the terminating resistor

Directivity increases with the length of the antenna. While directivity begins to develop at a length of only 0.25 wavelength, directivity becomes more significant at one wavelength and improves steadily until the antenna reaches a length of about two wavelengths. In Beverages longer than two wavelengths, directivity does not increase because the currents in the antenna cannot remain in phase with the radio wave.

A single wire Beverage antenna is typically a single straight copper wire, between one half and two wavelengths long, run parallel to the Earth's surface in the direction of the desired signal. The wire is suspended by insulated supports above the ground. A non inductive resistor approximately equal to the characteristic impedance of the wire, about 400 to 600 ohms, is connected from the far end of the wire to a ground rod. The other end of the wire is connected to the feedline to the receiver. A dual wire variant is sometimes utilized for rearward null steering or for bidirectional switching. The antenna can also be implemented as an array of 2 to 128 or more elements in broadside, endfire, and staggered configurations, offering significantly improved directivity otherwise very difficult to attain at these frequencies. A four element broadside/staggered Beverage array was used by AT&T at their longwave telephone receiver site in Houlton, Maine. Very large phased Beverage arrays of 64 elements or more have been implemented for receiving antennas for over the horizon radar systems. The driving impedance of the antenna is equal to the characteristic impedance of the wire with respect to ground, somewhere between 400 and 800 ohms, depending on the height of the wire. Typically a length of 50 ohm or 75 ohm coaxial cable would be used for connecting the receiver to the antenna endpoint. A matching transformer should be inserted between any such low impedance transmission line and the higher 470 ohm impedance of the antenna.

U. S. Patent 1,381,089 Jun 7, 1921 Radio Receiving System the Beverage antenna
U. S. Patent 1,434,984 Nov 7, 1922 Radio Receiving System the bidirectional Beverage antenna
U. S. Patent 1,434,985 Nov 7, 1922 Radio Receiving System using a Beverage antenna with multiple receivers
U. S. Patent 1,434,986 Nov 7, 1922 Radio Receiving System a Beverage antenna with selective circuits to eliminate interference from adjacent wavelengths
U. S. Patent 1,487,308 Mar 18, 1924 Radio Receiving System improvements to the directivity of the Beverage Antenna
U. S. Patent 1,556,122 Oct 6, 1925 Radio Receiving System improvements to the directivity of the Beverage Antenna
U. S. Patent 1,658,740 Feb 7, 1928 Radio Receiving System broadside phasing of two of more Beverage antennas for improved directivity
U. S. Patent 1,768,239 Reducing interference received through a sidelobe of a Beverage antenna
U. S. Patent 1,816,614 Wave Antenna improvements to the directivity of the Beverage Antenna
U. S. Patent 1,821,402 Staggered Beverage antennas and phased staggered Beverage antennas