antenna itself can be considered an impedance transformer. The antenna transitions power received from the RF circuitry through the Tx line (matched to an impedance of 50 Ω in most cases) to free space (impedance of 377 Ω). Matching the input impedance of the antenna to 50 Ω is a requisite to ensure that the maximum

The words antenna and aerial are used interchangeably. Occasionally the equivalent term “aerial” is used to specifically mean an elevated horizontal wire antenna. The origin of the word antenna relative to wireless apparatus is attributed to Italian radio pioneer Guglielmo Marconi.In the summer of 1895, Marconi began testing his wireless system outdoors on his father's estate …

A half-wave dipole antenna consists of two quarter-wavelength conductors placed end to end for a total length of approximately L = λ/2.The current distribution is that of a standing wave, approximately sinusoidal along the length of the dipole, with a node at each end and an antinode (peak current) at the center (feedpoint): = ⁡ ⁡,where k = 2π/λ and z runs from −L/2 to L/2.

Mar 12, 2019 · The CM-3203 Antenna Balun Deluxe is a professional grade 300 to 75 Ohm impedance matching transformer used to connect standard coaxial cable to outdoor TV antennas with 300 Ohm connection terminals. It is compatible with all 300 Ohm outdoor TV antennas and enhances performance over in-expensive standard baluns.

The high impedance, half wave wire is matched to your 50 ohm feed point by an integral impedance matching toroid transformer, and rated is at 20 watts. The SWR is further broadened and lowered across 80m-10m with a high voltage capacitor on the primary of the transformer using band specific radiator lengths.

Radio-frequency identification (RFID) uses electromagnetic fields to automatically identify and track tags attached to objects. An RFID system consists of a tiny radio transponder, a radio receiver and transmitter.When triggered by an electromagnetic interrogation pulse from a nearby RFID reader device, the tag transmits digital data, usually an identifying inventory number, back …

A matching network, also called an impedance transformer, is used to create matched impedance between a source and a load (for example, between a power amplifier and an antenna). Lossless matching networks consist of reactive components only; resistive components are avoided because they would dissipate power, whereas the matching network is ...

The coupler is a tuned impedance transformer, not an antenna ‘tuning’ unit. Stick to the above, and it should be a sure thing! Feeding a 21MHz half wave. ... This specific type of matching is known as a “Fuchskreis” and was invented by an Austrian fellow called Joseph Fuchs OE1JF in 1927. In those days it was even simpler to match as ...

Power dividers (also power splitters and, when used in reverse, power combiners) and directional couplers are passive devices used mostly in the field of radio technology. They couple a defined amount of the electromagnetic power in a transmission line to a port enabling the signal to be used in another circuit. An essential feature of directional couplers is that they only couple …

A balun / ˈ b æ l ʌ n / (from "balanced to unbalanced", originally, but now dated from "balancing unit") is an electrical device that allows balanced and unbalanced lines to be interfaced without disturbing the impedance arrangement of either line. A balun can take many forms and may include devices that also transform impedances but need not do so. Sometimes, in the case of …