A dipole antenna uses two conductors of the same length to detect radio waves and transmit the corresponding variable electrical current to a receiver. Each conductor represents one-quarter of a wavelength, and when combined, the dipole can detect a half-wavelength signal. The length of the two conductors determines the operational frequency.Know More
Dipole antenna conductors can be wires or metal rods, depending on the design. One conductor provides the feeder while the other provides a second signal path, balancing each of the one-quarter wavelengths. Some receivers use the feeder signal and ground the other signal, but many designs use a coaxial connection to feed both signals. With coaxial connections, an additional device called a balun helps balance both signals and reduce potential radio frequency noise. Dipole antenna designs range from simple two-wire units to complex folded dipoles mounted on a mast. Folded designs allow for longer conductor lengths without additional space and are typically used by professionals.
Before cable television, most households had some kind of dipole antenna. Early televisions used “rabbit ears,” a dipole antenna with telescoping conductors at an angle. Adjusting the length of the conductors and the corresponding angle usually produced a strong signal for some channels. Later televisions and radio receivers used the coaxial design, and most came with a balun as part of the packaging.Learn more about Audio Equipment
The requirements for antennas designed to operate with a ham radio depend on what bands the operator wishes to access. Height, size and configuration are primary considerations for any antenna designed to work with a ham radio.Full Answer >
A binomial array antenna is an array of non-uniform amplitudes in which the amplitude of the radiating sources is arranged according to the coefficient of successive terms of a binomial series. The binomial array acts as a multistate phase diversity antenna.Full Answer >
An FM radio antenna can be made at home by cutting lengths of 16-gauge insulated wire and connecting it to the FM radio or an audio amplifier. Some radio signals are very strong and will not require much of an antenna, but a larger antenna may be required to pick up weak radio signals.Full Answer >
Make an FM dipole antenna at home using two 5-foot sections of antenna wire. Connect one section to one of the wires in the middle of the other section, strip a small section of insulation from each end, and tie the two wires in the top section together. The process takes just a few minutes.Full Answer >