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Patent

Active antenna capable of wireless signal transmission and reception and mobile communication terminal having the same

TLDR
In this article, an active antenna capable of transmitting and receiving a wireless signal of a low frequency band and a mobile communication terminal having the active antenna, is provided, which includes an antenna element which transmits and receives wireless signal, a filter which filters the wireless signal being received at the antenna element, and an amplifier which amplifies the wireless signals being passed through the filter.
Abstract
An active antenna capable of transmitting and receiving a wireless signal of a low frequency band and a mobile communication terminal having the active antenna, are provided. The active antenna includes an antenna element which transmits and receives a wireless signal, a filter which filters the wireless signal being received at the antenna element such that a wireless signal belonging to a frequency band lower than the operating frequency of the antenna element is passed, and an amplifier which amplifies the wireless signal being passed through the filter. As a result, the size of the antenna can be greatly reduced, by the use of an active antenna which receives wireless signals of low frequency bands. Additionally, a more compact mobile communication terminal can be provided, because wireless signal of both high frequency bands and low frequency bands can be transmitted and received at one antenna.

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Citations
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TL;DR: In this paper, an antenna system consisting of an antenna body, an adjustable device, and a first filter and / or a second filter is described. But the antenna body is not connected with the adjustable device.
References
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