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This paper presents a miniature implanted antenna operated at medical implant communication systems (MICS) band (402–405 MHz) with the dimension of 40×10×1.905 mm3 for biotelemetry. The antenna is fabricated on biocompatible Ceramic Alumina substrates. For simplicity three □ layer human tissues are adopted first. With the special arrangement of the antenna structure, a spiral □ like current distribution...
This paper presents a novel intelligent metamaterial (I-MTM) design for specific absorption rate (SAR) reduction. The I-MTM can distinguish whether the phantom is close to or far away from itself. In turn it will show different properties. In the SAR reduction mode, the peak SAR value can be reduced by around 56%. In the normal mode, the I-MTM will not affect the performance of an antenna.
A novel cross-S-shape metamaterial structure is proposed. This metamaterial radome is suitable for circularly-polarized antenna. The radiation patterns of the patch antenna with and without metamaterial are also measured. The results show that there are 3dB improvements of the antenna gain and HPBW is also reduced,after adding metamaterial radome. The impedance bandwidth and AR bandwidth are also...
We find that using metamaterial antenna radome made by 90 degree rotational symmetric unit cell structure can enhance the gain of dual-polarized antenna. The Jerusalem cross structure is proposed for dual-polarized antenna radome and its refraction index is designed to be near zero. This radome is designed for the WiMAX applications. Simulation results show that this antenna radome can improve the...
Single negative metamaterial designed in MIMO antenna is suitable for portable applications. Metamaterials reduce the coupling at a separation distance of 0.18-wavelength for the MIMO system. Multi-layer metamaterials with different spiral length can improve the isolation bandwidth. In our design, it can cover whole WiMAX bands. And Omega-shape arrangement is also proposed; the isolation has 6dB improvement...
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