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Tuned circuits (variable reactances) have been used between the antenna and the transmitter or receiver since the early days of wireless communications. Indeed one of the pioneers, Oliver Lodge, patented several tuned circuits for maximizing the signal transfer between the antenna and the transmitter/receiver as early as 1898. Some examples are shown in Error! Reference source not found. [1, 2]. Lodge's...
Mobile phones are being required to operate with increasingly more communication protocols. Since simultaneous operation of several services is required, this leads to a greater number of antennas. Further, the introduction of Long Term Evolution (LTE) makes it mandatory to accommodate two antennas for Multiple Input Multiple Output (MIMO) operation. However, despite the increase in the number of...
Phone output power and radiation efficiency are degraded by large mismatches, due to compact narrow-band antennas and influence of the user's hand position. This paper presents a 5 mm × 5 mm multi-band multi-mode adaptive tuning module that counteracts antenna impedance mismatch. The measured average total radiated power (TRP), of a commercially available phone with adaptive tuner, improves by 2.2...
This paper presents details of a self-diplexing dual antenna system and associated antenna interface module. The manufactured demonstrator operates efficiently in 4 GSM bands and 3 UTRA bands with antennas that are just are 6mm high. It is shown that the VSWR can be maintained below approximately 4:1 in all modes no matter how the phone containing the antennas is held.
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