The Defense Innovation Unit is looking to find a prototype small high-frequency direction-finding antenna that it could mount on a fixed-wing aircraft. The U.S. Department of Defense wants a ...

By coupling an Adcock antenna and an oscilloscope, Watt was able to rapidly lock onto a lightning bolt or a radio transmitter. The military high-frequency direction finder or huff-duff proved ...

It seems another ham built the antenna and a control box for it which he’s sent to [DX Commander] although he hasn’t set it up yet to create an 80 meter directional antenna.

An antenna's directive gain, as implied in the math above, is defined by its region of maximum directivity of the main beam. If the half-wave dipole is perpendicular to the ground, it is ...

We have been able to conclude that using an isotropic antenna, an RFID reader might achieve a read range of a few meters with 1 watt of output power. This configuration might be fine ifRFID tags of ...

At frequencies below 500 MHz, the antennas are not as directive as those used at microwave frequencies. To get a high directivity at those frequencies, horns would have to be very large.

Technavio analysts forecast the global automotive antenna module market to grow at a CAGR of over 9% during the forecast period, 2018-2022.

Description An introduction to properties of individual antennas and arrays of antennas. Retarded potentials, dipoles of arbitrary length, radiation pattern, gain, directivity, radiation resistance.