This effect can cause radiated signals out of the desired band, even if the signal into a passive antenna is carefully band-limited.
2.
The advantages of an active antenna compared to a passive antenna and a separate amplifier is that the ( low ) signal can be amplified before it is subject to loss and / or interference in the cables and connectors between antenna and amplifier.
3.
The cases use a passive antenna coupling technology works via a micro-thin gold-plated antenna embedded inside the Pong Case that redistributes the RF signal emitted from a mobile device away from the user s head and body without compromising the device s ability to communicate.
4.
Among the technology Parsec designs and manufactures are antennas ( surface mount, embedded and cabled versions of ) GPS, GNSS, LNA for GPS / GNSS systems, allowing for improved immunity against out of band jammers ( LTE, GSM, UMTS, WLAN ) as well as a highly efficient micro-miniature active or passive antenna technology for consumer, automotive and military applications.
मोबाइल