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Some general formulae for the properties of single tuned electrically small antennas are reviewed. For many types of such antennas, their impedance around resonance behaves like either a series tuned or parallel tuned LCR resonator. The effect of deliberately increasing Ohmic losses in order to improve bandwidth is investigated. While the impedance bandwidth can improve, the ratio of radiated power...
This paper presents a novel reconfigurable handset antenna for use in current and future wireless communication systems. The construction of the antenna is simple, allowing independent and versatile dual frequency and bandwidth reconfiguration, using simple external matching circuits. The antenna incorporates two metal elements which are capacitively coupled to excite resonant modes within the handset...
A new method of meandered variable pitch angle printed Quadrifilar Helix Antenna (MVPQHA) is described. This type of antenna helps in reducing the size of the printed quadrifilar helix antenna (PQHA) and makes the bandwidth of the antenna broader. The new type of antenna is compared with other existing types of printed quadrifilar helix antenna in terms of size, return loss and bandwidth.
A plaster antenna for 2.45 GHz applications is presented. Measurement results for different use cases are given, and bending effects are examined. The proposed structure exhibits a 6 dBi on-body gain, and covers the 2.4-2.5 GHz ISM band in all use cases. The effect of bending the antenna on the SAR has been investigated by simulations. The antenna is suitable for medical applications.
The paper continues investigations of antennas for the miner cardiac rhythm sensor. The sensor and the beacon are placed in the battery's box of a miner's lantern. Measurements of cardiac rhythm are based on measurements of reflected microwave energy. The mutual positioning of the battery's box with the sensor and human body is changed continually. Previous investigations have shown that a simple...
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