A recent trend in medical practice is the use of wearable wireless body sensors (WBS) to improve mobility of patients and medical personnel during surgery and other procedures, accelerate patients’ recovery, and facilitate remote monitoring of patients suffering from chronic diseases. Currently, Wireless Body Area Networks (WBANs) are being introduced in already crowded unlicensed frequency ban...

A mosaic of 7 ROSAT PSPC pointed observations in the direction of (l, b ∼ 10◦, 0◦) reveals deep X-ray shadows in the 0.5 − 2.0 keV band cast by dense molecular gas. The comparison between the observed on-cloud and off-cloud X-ray fluxes indicates that ∼ 43% of the diffuse X-ray background in this direction in both the 34 keV and 1.5 keV bands originates behind the molecular gas, which is locate...

This research proposes a development of embroidered dual band textile antenna that could integrate wearable telecommunication device with a garment. The proposed antenna could operate at 2.4 GHz and 5.8 GHz of WLAN applications. Two versions of the presented antennas are developed from the conventional rectangular patch. Two types of slot structures are loaded on each antenna and the antenna pe...

We present the design of a flash memory for passive RFID transponders, implemented in a standard – single poly 0.35 μm CMOS process. The memory has 128 bits, sufficient for example to contain the EPC code for Class 0 tags, and is able to perform a complete read operation of all 128 bits with an access time of about 10 ms and a power consumption of only 160 nW. In the erase/program mode Fowler-N...

We present wide-field near-infrared images of the DR21/W75 high-mass star forming region, obtained with the Wide Field Camera, WFCAM, on the United Kingdom Infrared Telescope. Broad-band JHK and narrow-band H 2 1-0S(1) images are compared to archival mid-IR images from the Spitzer Space Telescope, and 850µm dust-continuum maps obtained with the Submillimeter Common User Bolometer Array (SCUBA)....

Recently, there has been growing interest in opportunistically utilizing the 2.4 GHz ISM-band. Numerous spectrum occupancy measurements covering the ISM-band have been performed to analyze the spectrum usage. However, in these campaigns the verification of the correctness of the obtained occupancy values for the highly dynamic ISMband has not been presented. In this paper, we propose and verify...

Problem statemet: Wideband compact antenna is highly demandable due to the dynamic development in the wireless technology. Approach: A simple, compact EBG microstrip antenna is proposed in this study that covers a wideband of 250 GHz and the design is conformal with the 2.45 GHz ISM band (WLAN, IEEE 802.11b and g)/Bluetooth/RFID applications. Results: A 6×6 array of square unit cell formed the ...

Context. Infrared (IR) spectra provide a prime tool to study the characteristics of polycyclic aromatic hydrocarbon (PAH) molecules in regions of star formation. Herbig Ae/Be stars are a class of young pre-main sequence stellar objects of intermediate mass. They are known to have varying amounts of natal cloud material still present in their direct vicinity. Aims. We characterise the IR emissio...

This paper proposes a frequency/polarization reconfigurable antenna (RA) incorporating Frequency Selective Surface (FSS) to achieve dual-band and similar high-gain characteristics. The proposed RA-FSS design using 4 PIN Diodes can produce reconfigurability between circular polarization (CP) at 1.8 GHz linear (LP) 2.45 GHz. fabricated prototype shows good CP performance while the measured peak b...

Abstract In this study, we present a low-profile dual-spectrum split-ring monopole that operates at industrial, scientific and medical (ISM) (2.45 GHz) band ultrawideband (UWB) spectrum (3.1–10.6 GHz). We optimised the design for dual-band operations by using circular radiators. The coupling between both rings drives structure to achieve quasi-resonance frequencies in UWB spectrum. A s...