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Ambient backscatter [1] uses existing radio frequency signals, such as radio, television and mobile telephony, to transmit data without a battery or power grid connection. Each such device uses an antenna to pick up an existing signal and convert it into tens to hundreds of microwatts of electricity. [ 2 ]
Antenna temperature (T ant) is a parameter that describes how much noise an antenna produces in a given environment. Antenna noise temperature is not the physical temperature of the antenna but rather an expression of the available noise power at the antenna flange. Moreover, an antenna does not have an intrinsic "antenna temperature ...
An antenna designer must take into account the application for the antenna when determining the gain. High-gain antennas have the advantage of longer range and better signal quality, but must be aimed carefully in a particular direction. Low-gain antennas have shorter range, but the orientation of the antenna is inconsequential.
The Portal TV installs on nearly any TV to deliver big-screen Messenger, WhatsApp and Zoom calls. (Photo: Facebook) If you've ever used your phone for a video call, you know that a small screen ...
The Fire TV Recast is a digital video recorder that works with an over-the-air antenna to record shows for later viewing on a Fire TV or an Amazon Echo Show device. [53] [54] It was announced in September 2018 and began shipping in the United States on November 14, 2018. [55] In August 2022, Amazon confirmed the discontinuation of the Fire TV ...
Fire TV (box) [1] [2] Fire TV Stick Fire TV (box) [3] [2] Fire TV Stick Fire TV (pendant) [4] [5] Fire TV Cube Fire TV Stick 4K [2] Fire TV Cube Fire TV Stick Fire TV Stick 4K Max Fire TV Cube Fire TV Stick 4K Fire TV Stick 4K Max Fire TV Stick HD Model generation 1st 1st 2nd 2nd 3rd 1st 1st 2nd 3rd 1st 3rd 2nd 2nd Code name Bueller Montoya ...
A short antenna pole next to a house Multiple Yagi TV aerials. Antennas are commonly placed on rooftops and sometimes in attics. Placing an antenna indoors significantly attenuates the level of the available signal. [19] [20] Directional antennas must be pointed at the transmitter they are receiving; in most cases great accuracy is not needed ...