For measuring complex relative permittivity of more than 300 GHz in the THz region, time-domain spectroscopy (TDS) is usually used. On other hand, a free-space method using vector network analyzer (VNA) used below GHz. However, these methods have not been compared and continuity measurement around has evaluated. We developed system for that can be operated at 220-330 This based on method. VNA by TDS to evaluate our frequency domain. first dielectric loss between both methods. then evaluated...

We present 20-Gbps wireless ASK data transmission at 300 GHz with an all-electronic transmitter and receiver for KIOSK instant downloading applications. The MMICs are based on 70-nm indium-phosphide-based high electron mobility transistor technologies of which the cut-off frequency (fmax) is approximately 700 GHz. For experiment, were packaged in a split-block waveguide dedicated metallic housing, respectively. With 30-dBi 25-dBi horn antennas receiver, error free (bit rate < 1 × 10−9) was...

Fifth generation (5G) mobile communication systems have been deployed in the millimeter wave (mmWave) band. Since electromagnetic (EM) waves this band exhibit high propagation loss and antennas are highly directive, performance of wireless communications is largely degraded a non-line-of-sight (NLOS) area, resulting limited coverage area. To improve increase metamaterial-based scattering sheet (EMSS) with broad characteristics proposed paper. We also introduce fast design optimization...

To realize the terahertz fixed wireless communication links, a high gain antenna is required to compensate large path loss of frequency band. In this paper, antennas horn, cassegrain and off-set parabolic types are developed, these radiation patterns measured at 300 GHz. The compared with mathematical models lower band, it found that they have good agreements. This study can contribute link budget design interference evaluation systems.

Measurement of the dielectric properties ocular tissues up to 110 GHz was performed by coaxial probe method. A sensor fabricated allow measurement small amounts biological tissues. Four-standard calibration applied in property obtain more accurate data than that obtained with conventional three-standard calibration, especially at high frequencies. Novel several are presented and compared from de facto database.

Theoretical and experimental investigations are carried out on the degradation in performance of DS-SS wireless LAN systems (WLANs) (IEEE802.11b) caused by electromagnetic noise radiating from microwave ovens 2.4-GHz frequency band. Based time-domain oven-noise model, theoretical expressions for short-duration bit-error rates (BERs) packet-error rate (PERs) derived. Measurements were done using commercially available a simulator that consisted function generator an RF synthesizer. The PERs...

For the wireless communication systems in Beyond 5G era, utilization of frequency range above 100 GHz is considered for high-speed transmission. Therefore, transmission loss models will be required to design such sub-terahertz and terahertz systems. In this paper, coefficients office corridor environments are studied based on indoor propagation measurements at multiple frequencies from 232 330 GHz. Also, parameters model extracted with reference site general ITU-R Recommendation P.1238-11.

A new method for determining the optimal modulating waveform spread spectrum clock generation (SSCG) is proposed to minimize peak amplitude of harmonic spectra measured in electromagnetic interference (EMI) tests. The can be easily obtained as a solution first-order differential equation that includes impulse response receiver filter used measurement. To verify validity method, waveforms and resultant are calculated various frequencies resolution bandwidths. Results show becomes similar...

A time-domain noise model is developed for analyzing the performance degradation of wireless communication systems in 2.4 GHz band caused by microwave ovens, taking into account generation mechanism and its characteristics. The proposed consists a series frequency-modulated tone bursts, which can be realized with set FM/AM modulators. It yields simple general expression waveform terms six parameters that determined from measurements. Band-limited waveforms also derived via approximations....

Dynamic service composition provides the potential for future applications to adapt various user preferences and contexts. Despite its difficulties, dynamic several benefits, namely, flexibility, adaptability, availability. However, existing systems lack extensibility understandability. Also some cannot support operation dependency soft-state information. To overcome problems of systems, this paper proposes a new component model called with semantics, or CoSMoS. CoSMoS resolves by applying...

Conducted disturbance measurements on the mains cable are seriously affected by equipment under test port impedance of artificial network (AMN). This is called AMN impedance. In order to measure impedance, an ac-coaxial adapter has be used connect measuring equipment. Accordingly, accurately calibrated. paper describes theoretical and experimental investigations characteristics conventional calibration methods, i.e., open/short termination method, electrical length correction Kriz's method....

Simple formulae were theoretically derived for estimating the reduction in amplitude of clock harmonics, as measured electromagnetic interference (EMI) tests, due to frequency modulation (FM). They show how is related FM parameters and resolution bandwidth (RBW) spectrum measurement. Numerical simulations experiments clearly demonstrated validity this analysis. Because does not reduce actual power apparent decrease harmonic must be carefully treated when evaluating potential radiated...

Theoretical and numerical analyses are conducted on the bit error rate (BER) of orthogonal frequency division multiplexing (OFDM)-based wireless LAN (WLAN) systems that subjected to electromagnetic interference (EMI) caused by radiated noises from personal computers (PCs). The aim analysis is investigate impact frequency- modulated harmonic generated spread-spectrum clock (SSC) in PCs. SSC techniques commonly employed order reduce spectral amplitude harmonics measured EMI compliance tests....

We present a 20-Gbit/s ASK wireless system in the 300-GHz band for kiosk data downloading. The front-ends (transmitter and receiver) are manufactured by using InP-based monolithic microwave integrated circuits with high electron mobility transistors. successfully demonstrate transmission these at link distances from 50 cm to 1 m. measured bit error rate is less than 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-6</sup> up distance of

Almost all digital equipment has electromagnetic interference (EMI) suppression ferrite cores to encircle cables, such as mains and peripheral cables. However, their EMI capability is hardly evaluated from the impedance characteristics provided by manufacturers. Hence, this paper proposes characterize in terms of insertion loss reflection coefficient. Theoretical experimental investigations are carried out develop a measurement jig for these parameters frequency range 30 1000 MHz. It...

The phase center location is used to determine the gain for horn antennas using three-antenna method. of a pyramidal-horn antenna in 18 26.5 GHz frequency range was calculated finite integration method, and then measured by distance between locations obtained from this calculation. results on basis were good agreement with theoretical values. uncertainty (k = 2) measurement 0.13 0.16 dB given range.

A broadband rectangular waveguide calorimeter is fabricated to establish a reliable mm-wave power standard in the frequency range from 110 GHz 170 GHz. Two types of meter are calibrated using this and their calibration factors reported with uncertainties. Uncertainty calculations based on Monte Carlo method.

A calorimeter based on single-mode WR-03 waveguides is developed with the aim of establishing a measurement standard for terahertz (THz)-wave power over frequency range 220-330 GHz. Correction factors such as thermal leakage are estimated by actual measurements. This measures absolute THz waves substituting dc power, isothermal temperature control technique. commercial meter waveguide calibrated direct comparison at level 0.1 mW. The calibration evaluated in range, associated uncertainties...

Frequency identification for the mobile communication system in 275–450 GHz was started World Radiocommunication Conference 2015. Therefore, propagation model is required to enable sharing and compatibility studies between land-mobile, fixed passive services. In this study, indoor characteristics at 300 measured analyzed develop path loss models. Measurements have been carried out office corridor environments line-of-sight situation, coefficients are extracted. The coefficient of environment...

In recent communication networks, 100 Gb/s passive optical Ethernet networks have been established and started becoming widely used. consumer broadcasting, the use of high-definition television in studio live-relay broadcasts has planned by Japanese government. These high-speed wireless technologies require millimeter-wave frequency band from 30 to 300 GHz provide sufficient bandwidth. a link system, spurious signals must be identified managed accordance with Radio Law relating...

This study aimed to calibrate power meters in the frequency range of 140-220 GHz (WR-05 band). To this end, a WR-05-waveguide calorimeter is designed as reference standard. The based on dc-substitution method which absorbed substituted for dc heat. A detailed thermal analysis performed coefficient and heat leakage adiabatic waveguide, are dominant contributors uncertainty, measures decrease uncertainty determined. Experiments clarify contributions these factors uncertainty. $W$ -band meter,...

The measurements of the characteristics an artificial mains network (AMN) are always affected by AC-coaxial adapter connecting impedance measuring equipment to AMN. present paper theoretically investigates influences on measured AMN S-parameters in terms mode S-parameters. As a result, it proposes correction method for eliminating order reveal true characteristics. experimental using two adapters considerably different prove that proposed can yield almost same estimates impedance.