Calcified Algae for Tissue Engineering.

This book presents the latest advances in marine structures and related biomaterials for applications in both soft- and hard-tissue engineering, as well as controlled drug delivery

Increased operational range for implantable UHF RFID antennas

This paper discusses the main design challenges of implantable UHF RFID antennas in lossy environments. A novel cylindrical implantable antenna concept is presented. The proposed antenna shows good performance inside lossy environments, like a human body. The RFID tag is able to work in a range up to 3 m for implantation depths in the range of 1 - 2.5 cm. A basic demonstrator with RFID integrated circuit (IC) was manufactured and tested in order to prove the proposed design strategy

Focal-Plane Arrays with Improved Scan Capabilities

This article investigates the limits of focal-plane array (FPA) technology by studying a double-reflector antenna system with wide-Angle scan capabilities. The proposed reflector configurations are analyzed in terms of effective isotropic radiated power (EIRP) maximization, minimization of the required total number of array elements for a wide-scan range, and the highest number of simultaneously active array elements of the phased-Array feed. Presented configurations have capabilities to operate in the scan range up to ± 30° in azimuth (±35 beamwidths scan) and ± 3° in elevation. It has been demonstrated how different optimizations could allow to build systems with varying performance in terms of the key operation parameters, such as array size, EIRP, and the number of active array elements. A detailed analysis is provided that demonstrates the potential applicability of this concept in future millimeter-wave (mm-wave) applications

Miniaturization of robust UHF RFID antennas for use on perishable goods and human bodies

Design guidelines for electrically small and robust UHF RFID antennas are derived for operation in complex environments, such as perishable goods (e.g. meat and milk) or human bodies. A prototype UHF RFID antenna tag with an embedded Integrated Circuit (IC) is developed and tested in a RFID system. Water and meat tissue are used as environments. The obtained range of operation appears to be very robust. Measurements show a range of 3 m for the meat case and 2.5 m for a water environment at 868 MHz

Fundamental challenges for wideband antenna elements in focal-plane arrays

This paper discusses the main design challenges of wideband antenna elements which can be used in focal-plane arrays. A novel electrically-small wideband antenna is presented. It is based on a bow-tie antenna. The proposed antenna shows excellent input matching properties over a frequency band of more than one octave and nearly reaches the theoretical Chu-Harrington limit. It is shown that the centre element of a five-element feed array, operating at a centre frequency of 30 GHz, realizes an input matching bandwidth of 24.4 GHz

Increased operational range for implantable UHF RFID antennas

This paper discusses the main design challenges of implantable UHF RFID antennas in lossy environments. A novel cylindrical implantable antenna concept is presented. The proposed antenna shows good performance inside lossy environments, like a human body. The RFID tag is able to work in a range up to 3 m for implantation depths in the range of 1 - 2.5 cm. A basic demonstrator with RFID integrated circuit (IC) was manufactured and tested in order to prove the proposed design strategy