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This paper presents a circularly polarized antenna on thin and flexible Denim substrate for Industrial, Scientific and Medical (ISM) band and Wireless Body Area Network (WBAN) applications at 2.45 GHz. Copper tape is used as the conductive material on 1 mm thick Denim substrate. Circular polarization is achieved by introducing rectangular slot along diagonal axes at the center of the circular patch...
Establishing reliable and direct communications links from Earth to Mars rovers, also known as Direct-to-Earth (DTE) communications, is a complex and challenging antenna design problem. With the possibility of diminished UHF relay assets for the upcoming Mars 2020 mission, supporting such a technology requires a high performance antenna array system in order to enable substantial return of valuable...
Wearable RFID tags and wireless sensors can be used for on-body and human monitoring applications. Embroidery with conductive thread provides compelling means for the fabrication of seamlessly garment-integrable antennas for wearable tags and wireless sensors. In this paper, we present the fabrication of fully assembled tags based on embroidered dipole-type antennas. The prototype tags achieve 5.5-to-7...
Small millimeter-wave antenna designs present particular difficulties when measured. With most available antenna chambers and ranges originally designed for larger size and lower frequencies, physically smaller antennas are dwarfed by the large support structures and cannot be efficiently characterized. Modification of these existing ranges for small antennas and high frequencies may prove to be very...
Planar near-field measurement of small antennas operating at millimetre-wave frequencies are often wrought with difficulty. Over-sized ranges, cable loss, expensive equipment, long measurement times, and positional accuracy are just some of the issues that contribute to making measurements inefficient and cumbersome for most laboratories. As more compact millimetre-wave antenna designs are introduced,...
The emergence of the near-field phaseless measurements as viable solutions to the antenna measurements at higher frequencies has created a lot of enthusiasm among the researchers. There had been an ongoing desire to enhance these techniques to a level where they can perform as accurate as the current amplitude-phase near-field techniques. The implementation of these techniques on different types of...
As new antenna designs require higher frequencies and smaller sizes, traditional large-scale antenna measurement systems become ill-suited for such measurements. External mixing, room-sized chambers, and expensive test equipment add large costs and burdens to antenna measurement systems. A smaller and more cost-effective system is presented in this paper. Using the bipolar planar scanning technique...
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