Simulation of a Yagi antenna that consists of three linear wires. A directional radiation pattern is obtained as can be expected.
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Simulation of a Yagi antenna that consists of five linear wires. The driven element is a folded dipole which does not change the radiation pattern shape, but it changes the input impedance for an easier impedance matching.
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Simulation of a Yagi antenna that consists of seven linear wires. A directional radiation pattern is obtained as can be expected.
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Directional helix antenna backed by a perfect ground plane. A directional radiation pattern is obtained pointing towards the helix axis.
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Frequency sweep simulation of a directional helix antenna backed by a ground plane of finite size. The ground plane is modeled using a circular grid of thin wires.
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This Quadrifilar Helix (QFH) antenna, also known as QHA, can be used for signal reception from NOAA satellites. These are omnidirectional antennas made up of 4 wires with a helical shape.
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The horizontal arms of the V-antenna are 3 wavelengths long, so six semi-cycles of a sine function can be seen as a current distribution along the arms.
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Inverted V antenna over real ground. The operating frequency is 7.2 MHz which corresponds to a wavelength of almost 40 meters.
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