In this paper, we first demonstrate a metasurface that offers spectral filter performances not yet reported for single-layer because of the limited number geometric parameters. The configuration is determined by conformational space annealing algorithm, which key toward being able to design desired frequency, bandwidth, and response type various wireless communication devices, including fifth-generation (5G) millimeter-wave devices. As proof-of-concept, fabricate very thin (50 μm) combined...

We numerically and experimentally investigate the field invasiveness of microwave signals using an electro-optic technique. The distortion standing wave voltage pulse waveform probed by technique is explored through both minimally invasive external non-invasive internal sensing configurations. First, we analyzed continuous imaging on a millimeter- scale coaxial transmission line highly accurate stable electro- optic scanning system. electric images from device are attained virtually...

A highly stabilized technique for the amplitude and phase measurements of electric fields in reactive near field a sophisticated high-frequency antenna array set is presented. Amplitude instability problems, which often occur electromagnetic metrology methods based on all-dielectric electrooptic sensing, have been overcome by real-time calibration system drift. The performance our reactive-near-field imaging system, as well its merits analyses metrology, introduced exploring 4 × patch array.

This paper proposes an air-gap applied adiabatic line for a coaxial transmission line. The characteristics with excellent microwave were simulated in terms of the S-parameter and heat transfer lines finite-element-method-based tool design. detailed design scheme is presented its performance evaluated. efficiency associated feature was analyzed by resistive equivalent circuit model We made stainless steel that had about 11 times greater thermal resistance than gapless line, beryllium copper...

Visualizing the electromagnetic field transformation inside a microwave mode conversion region has been considered to be only realizable by simulation studies.For first time, we present comprehensive experimental observation of electric occurring metallic waveguide TE 01 -to-TE 02 converter.An efficient electro-optic (EO) probe and its associated probing system were used for measuring pattern in external near-field as well internal penetrated converter.Utilizing optically measured patterns...

We present a field-calibrated electro-optic sensing system for measurement of the electric field radiating from high-power vacuum oscillator at ~95 GHz. The intense is measured in absolute scale via two probe-calibration steps, associated with photonic heterodyne scheme. First, micro-electro-optic probe, fabricated to less than one-tenth oscillation wavelength minimize field-perturbation due placed on aperture field-calculable WR-10 waveguide calibrate probe V/m scale. Then, using this...

Impairments of analog-to-digital converters (ADCs) used in digital real-time oscilloscopes (DRTO) have caused inevitable signal distortions measurements. To calibrate these errors with traceability, we propose a novel method that consists two steps. First, each transfer function the ADCs is measured using pulse trains from photodiode calibrated up to 110 GHz. Each data set superimposed convert repetitive single solve under-sampling problem separated depending on ADC. Then, signals device...

We present the design and analysis of a small planar loop antenna for applications in mobile RFID readers within cell phone band. Compactness antenna, crucial to size reduction antennas designed handsets, is realized by bending folded-dipole circular fashion. Furthermore, capacitive loading, through parasitic patch, created inside has an effect increasing electrical length structure. This enhanced provides tunability resonance frequencies secondary dominant radiation port center antenna. A...

The direct comparison technique using a transfer power standard with an adapter and its uncertainty are considered. A waveguide thermistor mount appropriate waveguide-to-coaxial serves new combined coaxial standard. In order to obtain the effective efficiency of standard, phase as well magnitude scattering parameters have be known. Consequently, give rise additional technique. this paper, K-band WR42-2.4-mm is used calibrate 2.4-mm sensor. Measurement results presented evaluated 2.5 % (k=2)...

The spatial and temporal evolution of the propagating fields in transition region between reactive radiating near-field distances a standard gain horn antenna operating within Ka-band are presented. Electric-field distributions with amplitude phase information measured minimal invasiveness by vector-stabilized, electrooptic field-imaging system. Acquiring complete vector-imaging data set, comprehensive propagation chart-which shows detailed field development at each wavelength plane full...

A microwave vector-measurement technique based on electrooptic probing with a micro-resonator sensor and electrical down-mixing of demodulated optical sideband is experimentally demonstrated. Detailed near-field distributions the amplitude phase radio-frequency-identification antenna are extracted compared field patterns obtained from an measurement system that instead employs photonic down-conversion to create baseband read-out signal. High-fidelity scans > 35 dB signal-to-noise ratio (SNR)...

A very concise field-calibrated electro-optic probe using interference of modulated beams is presented. model for interferometric sensing with a sensor proposed, utilizing the fringing slopes and field-induced phase retardations. The dynamic range experimentally explored by investigating modulation retardations respect to beam's polarizations. shows ≥45 dB over microstrip lines. This sensitivity acceptable realizing electric field imaging radiative electronic devices. absolute also...

본 연구는 국내 최초로 개발된 직접 비교법을 이용한 W-band 밀리미터파 전력 표준 전달 시스템에 대한 것이다. 이 시스템은 75~110 GHz 대역에서 도파관형 전력감지기의 실효 효율과 교정 인자를 측정하기 위하여 개발되었다. 시스템 구성의 핵심 요소인 방향성 결합기의 반사 특성 평가 기법을 소개하고 실험 결과를 보인다. 구현된 시스템을 이용하여 측정하고자 하는 인자 측정 보이고, 불확도 요인에 대하여 고찰한다. 기준값과 비교하여 의한 측정의 유효성을 검증한다. This paper introduces a millimeter-wave power standard transfer system using the direct comparison method. The was developed to evaluate effective efficiency and calibration factor of waveguide sensor. evaluation method measured...

We present a magneto-optic sensing system based on the "off-axis" optical probing technique to control measurement sensitivity of magnets with various field strengths. The magnetic is experimentally investigated in absolute scale through photonic calibration method standard electromagnet. Our all-dielectric probe has wide dynamic range (20 mT–3 T) good responsivity and low invasiveness against being measured. Utilizing this magnetic-field-calibrated system, we obtain distribution permanent...

KRISS-V, a V-band millimeter-wave source module for primary RF power standard and calibration system developed by the Korea Research Institute of Standards Science is here presented. The output KRISS-V several times higher than that commercial amplifier/multiplier chains highly stable (the deviations are less 0.01% in worst case). spectral purity high enough to consider it single-tone signal generator. We also added programmable attenuation capability remote control. Moreover, in-house...

A new calibration method of a power sensor for measuring the peak digitally modulated signals is introduced. This uses an amplitude-modulated sine-wave source and relatively simple to currently available that signal oscilloscope. Basic theory procedures correction factor are described. Using commercial calibrated with proposed method, Global System Mobile Communications at 900 MHz measured compared by Various examples choosing parameters also discussed. The best uncertainty in estimated be...

A free-space measurement system of the complex permittivity liquid samples is presented at millimeter-wave region. The scattering parameters two quartz plates were measured using method and was obtained. container then constructed with air gap spacing. filled forms a plate-liquid-quartz plate assembly. assembly are de-embedded to obtain reflection transmission coefficients material under test. Results for sample presented.

The Cylindrical near-field (CNF) scanning result of a base station antenna at 2 GHz frequency range is presented. Scanning performed in two perpendicular directions, and slanted polarization effect the base-station considered by synthesizing measurement. comparison results between CNF extrapolation technique based on three method far-field gains will be

An electro-optic (EO) field-mapping system that features a continuous-wave laser-diode optical source, an entirely fiber-coupled beam path, resonance-assisted EO-microcavity probe, and RF-downconversion mixing circuit is shown to be effective for extracting near-field vector RF information. The the first of its kind allow amplitude phase analysis signals interrogated with continuous no polarization components in EO-modulation section. A complete tangential-electric-field characterization...

The precise field pattern measurement and analysis of a typical whispering gallery mode excited in gyrotron are important to understand the interaction physics gyrotron. We precisely analyzed characteristic mode, rotating TE6,2 by photonic-assisted W-band (75–110 GHz) electro-optic imaging system. region diverges fast free space as it propagates from radiation port. Therefore, scanning patterns device-under-test should be performed close possible identify device's characteristics....

We report the fabrication and characterization of a sensitivity-stabilized fiber-optic probe for electric field sensing, which exhibits signal fluctuations less than ±0.2 dB with any polarization state incident beam. The instability issue in fiber-coupled sensors, often occurs due to birefringence drift lengthy optical fibers, can be well addressed proposed birefringence-free interferometric modulation scheme. fiber sensor could an excellent solution ultra-long remote sensing applications...

Fabrication method of a fiber optic electric field sensing probe using polarization maintaining (PMF) is described including birefringent axes aligning system. The basically fiber-coupled Fabry-Perot resonator where thin wafer LiTaO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> with an external cavity mounted onto the end PMF. An optical wave from superluminescent laser diode after linear polarizer parallel to slow axis PMF made enter...

This paper introduces a recently constructed V-band and an under development W-band waveguide microcalorimeters that will serve as primary power standards in KRISS. The design scheme of the V- is briefly presented, their basic performance was checked. We propose thermoelectric reference standard cover W- bands. also in-house source signal module for high RF low impurity output.

We demonstrate an endoscopic probing system to measure field distribution through a W-band waveguide. The electric fields propagating inside WR-10 waveguide are measured utilizing harmonics of femtosecond laser with minute photonic probe.