End-fed half wave. The following data are for the far field radiation patterns and 3D color views of an End Fed Half Wave Inverted-L antenna with a long, straight radiator at 40 feet and feed point straight down near ground. 40 Meter. Voltage and Current Distribution on a Half Wave Antenna •To get EM radiation, we need to accelerate some electrons •At end => Voltage max & current min •At center => Voltage min & current max •Feed impedance changes as the feed point moves •Min Z at center (typically 50-75 ohms) •Max Z at ends (typically 2-5K ohms) •Off Center Fed Dipole (OCFD) (typically ~200 ohms) Related Pages: End fed longwire or random wire antenna. 6. Groundplane Verticals (they are generally end-fed 1/4 wave radiators). More options for deployment under a picnic shelter r oof. A down-bend means higher takeoff angle, wider pattern, lower gain. The classic sloper antenna is a top-fed 1/4 wave vertical antenna sloping down and away from a tower. The square quad can be fed for either horizontal or vertical polarization merely by placing the feed point at the center of a horizontal arm or at the center of a vertical arm. Feeding a center fed 40 meter dipole, with parallel feeders and using it on 20 meters, again you will have a clover leaf pattern. 20 Meter. Since 1:1 match is achieved at the feed point in every installation, no tuner is needed so the antenna can be "remoted" without mismatch loss when using a longer piece of coax. This antenna is a half wavelength at the lowest frequency of operation, and then as the other bands on which t can be used are harmonically related, it provides a multiple number of half wavelengths. 6 Meter. The where the included angle between arms is 90 degrees pointing Up and 90 degrees pointing Down. The radiation pattern is very similar to a standard dipole on the first resonant frequency, and equally very similar to an Off-Center-Fed-Dipole on the resonant harmonic bands. 5. 4. Horizontal is 90°. The red line represents the horizontal radiation pattern and the blue line represents the vertical take off angle. The radiation pattern on each band follows the expected shapes for low antennas with increasing length. At On 20 meters, you'll have a clover leaf pattern. Power handling? J-pole . depending on how you address the counterpoise and this can effect the radiation pattern… Can be fed from the opposite end with virtually the same patterns and gain. Lets look at two far field radiation patterns of a V-dipole. The yagi plays the role of a ground plane, while the tower plays the double role of reflector and grounding "rod". The direction of radiation is the Blue trace on the polar graphs. The End Fed Antenna: Killer or Compromise? The coax on an end fed will radiate. Verticals and baluns . The second benefit is that the point of maximum radiation is half way along the antenna. Shown below are the radiation patterns for the Hy Power Antenna Company's 40 meter off center fed antenna mounted 60 feet above average ground. The sloper's feed point is anchored high above ground near the top of the tower on which sits a grounded HF yagi beam antenna. Generally: From an antenna modeling view an up-bend means more skyward radiation, narrower pattern, good gain. The variable SWR is the trade-off for having a very simple antenna. End fed half wave antenna: One method of providing a multi-band antenna for the amateur radio or ham bands is to use an end fed half wave antenna. 10 Meter. certain parts of the antenna, while radiation from other parts (the horizontally or vertically stacked short dipoles) is reinforced. Red color indicates the stronger radiation on 3D views. 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horizontal end fed antenna radiation pattern

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