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For a 50 Ω transmitter and 75 Ω 1/4 wave line, then the antenna impedance of 112.5 Ω would satisfy this requirement. This is a simple method, without resorting to a balun or using a 1:1 balun to better match a multi-wave wire. With the 4:1 balun, the best matched antenna impedance will be 112.5 × 4 = 450 Ω.
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A multibandantenna is an antenna designed to operate in multiple bands of frequencies. Multibandantennas use a design in which one part of the antenna is active for one band, while another part is active for a different band. Advertisement Techopedia Explains MultibandAntenna.
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A multiband antenna includes at least two polygons. The at least two polygons are spaced by means of a non-straight gap shaped as a space-filling curve, in such a way that the whole gap
Chelton V/UHF multiband antennas cover multiple discrete operating frequency bands and are designed for aircraft applications. Designed for a variety of applications including military and
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Often, we mislabel multi-band doublets as dipoles because the antenna is about 1/2-wavelength at the lowest frequency of operation. But to be strictly correct, that antenna is a dipole only at the lowest frequency of use. Fig.1 shows the two essential dimensions of a real dipole.
ZipTenna is a retractable multiband passive counterpoise antenna accessory to boost the effective power output for any VHF/UHF handheld radio that is using a 1/4 wave antenna. It can also be used on handheld scanner radios and handheld weather band radios to improve the incoming received signals strength.