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Built-in antennas in mobile equipments are often subject to changes in input impedance due to the proximity of objects, e.g. a user's hand/head, a desk, etc. The resulting mismatch can lower the efficiency of the RF power amplifiers (PAs), will reduce battery life, cause low communications quality, etc. To mitigate these problems, a novel automatic tunable antenna system using a probe is proposed...
<?Pub Dtl?>High-speed short-range wireless communication systems are expected to utilize the 60-GHz band. This paper presents a bonding wire loop antenna in a standard ball grid array (BGA) package for 60-GHz short-range wireless communication. The proposed antenna has a loop shape and consists of two bonding wires connecting to a complementary metal–oxide–semiconductor (CMOS) chip and a metal...
In wireless electric power transmission employing magnetic resonant coils, objects or debris in the vicinity of the coil cause impedance mismatching. The mismatching will decrease the transmission efficiency at the frequency for performing electric power transmission. We have investigated the efficiency improvement by impedance matching adjustment using variable lumped capacitors. In the present work,...
It is required to work in various surrounding environments in order that the small antennas used for mobile terminal and RFID tag are located in the vicinity of various objects including the human body and the metal. H-shaped antenna has been proposed to obtain the characteristics not to be changed by circumference environment. The H-shaped antenna has been designed by adjusting offset position and...
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