New and accurate laboratory results are reported for amorphous methane (CH ) 4 ice near 10 K for the study of the interstellar medium (ISM) and the outer Solar System. Nearand mid-infrared (IR) data, including spectra, band strengths, absorption coefficients, and optical constants, are presented for the first time for this seldom-studied amorphous solid. The apparent IR band strength near 1300 ...

The development of the Gateforest technology with new ultra-thin silicon substrates triggered research into its possible applications. RFID implementation, specifically the transmitter implementation, on this technology is investigated in this document. To start with, the measurement and simulation of circuit elements (passive and active) at high frequencies is done in order to verify that the ...

There is increasing interest in wireless ad-hoc networks built from portable devices equipped with short-range wireless network interfaces. IEEE 802.11b WLAN (Wi-Fi) and IEEE 802.15.1 WPAN (Bluetooth) are popular wireless emerging technologies. These technologies migrates wired system applications into the wireless domain. Applications includes, computing, sensing, and communication. Growth in ...

The design of an unequal-length 3-dB hybrid branchline coupler with center-tapped open stubs on series arms is described. The design has been implemented for GSM (900 MHz) and ISM (2.45 GHz) dual-band operation. Simulation results have been verified against experimental results. The agreement between the two sets of results is found to be quite satisfactory. The size reduction, compared to the ...

This demonstration shows how VESNA wireless sensor nodes can be used for cognitive radio experiments involving wireless sensor networks. SNE-ISMTV is a radio frontend that has been developed for this purpose. Spectrum sensing capability in the TV white-spaces and 2.4 GHz ISM band is demonstrated by running receivers in a swept-tuned spectrum analyzer configuration and displaying measured spectr...

Bluetooth is a radio technology for Wireless Personal Area Networks operating in the 2.4 GHz ISM band. Since both Bluetooth and IEEE 802.11 devices use the same frequency band and may likely come together in a laptop or may be close together at a desktop, interference may lead to significant performance degradation. The main goal of this paper is to propose solutions to the interference problem...

A novel compact multiband microstrip EMI filter based on metamaterials is presented. The filter is implemented by means of splitrings resonators and complementary spiral sub-wavelength resonators, conveniently coupled to the victim transmission line. The suitable combination of these resonators allows us to design several stop-band frequency responses located at 900MHz (RFID UHF), 1.8GHz (GSM) ...

In this paper a long-range wireless mesh network system is presented. It consists of three main parts: Remote Terminal Units (RTUs), Base Terminal Units (BTUs) and a Central Server (CS). The RTUs share a wireless network transmitting in the industrial, scientific and medical applications ISM band, which reaches up to 64 Km in a single point-to-point communication. A BTU controls the traffic wit...

In this paper, a closed square ring resonator loaded 2-port Multi Input Output (MIMO) is proposed for dual-band applications in the S and C band. The presented antenna model designed by loading it FR-4 substrate with feedline of 50Ω SRR enhancement isolation radiation pattern. Ansoft HFSS used to obtain simulated parameters frequency ranges 2.2-2.5 6-6.3GHz. Measurements confirm characteristics...

In this study, two different types of 90-degree hybrid mixers were designed and analyzed in an ISM (industrial, scientific, and medical) 2.4 GHz band. The first is a general type; the other, a low-distortion type. For the low-distortion type, the 1-dB compression point and the third interception point are increased about 3-dB. The proposed mixers have a major shortcoming with a significant pena...