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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...
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