In this paper, one simple dual-band (28 and 38 GHz) circularly polarized slotted patch antenna, suitable for future millimeter wave mobile communication, is presented. The proposed monolayer antenna considered without any 90° phase shifter excited by a single-feed microstrip line, which very desirable high gain array implementation in band order to compensate the link loss. From EM simulation, it has been found that dimensions of L-shaped slots significantly affect performance antenna....

A wideband circularly polarized L-shaped monopole slot antenna with a single C-shaped feed is designed and fabricated. The measured results demonstrate that the has an axial ratio (AR)<; 3dB, reflection coefficient <; -10dB, 23% circular polarization (CP) bandwidth. quarter-wavelength design occupies half of area on corner circuit board as compared to half-wavelength requires double at center board. This feature attractive for compact wireless devices operate low frequencies in which...

This paper introduces a quadrature fractional-N cascaded frequency synthesizer and its phase noise analysis, optimization, design for future 5G wireless transceivers. The performance improvement of the phase-locked loop (PLL) over single-stage PLL in terms jitter power consumption is theoretically presented verified with measured results. implemented using first-stage charge-pump followed by second-stage dividerless subsampling PLL. fractional division high-resolution mixer lower...

In this work, a mm-Wave vertically-polarized electric dipole array solution for 5G wireless devices is presented. The fabricated using vias in standard PCB process to fit at the phone or tablet edges featuring wideband operation with broad half-power beamwidth elevation plane (HPBWELEV), high gain and front-to-back radiation ratio (F/B). For enhanced gain, parasitic-vias are added front of as directors. To improve HPBW without sacrificing directors implemented V-shaped bisection...

This paper derives a novel continuum of Doherty power amplifier (PA) solutions with enhanced load modulation over an extended RF bandwidth. It is analytically shown that PAs efficiency peaks at maximum and arbitrary back-off level can be achieved numerous configurations output combiner. Generalized governing equations for carrier peaking transistor current ratios, voltage profiles, biasing conditions are derived in order to assess the performance any configuration. The generalization...

In this paper, a stair-planar phased array antenna system for mobile broadcast satellite reception in Ku-band will be introduced. The height of the is only 6 cm and has two-dimensional electronic scanning capability. design procedures low profile high gain microstrip sub-array antennas, noise amplifiers, hybrid analog phase shifters, along with novel fast beamforming algorithm discussed paper. receives LHCP RHCP signals simultaneously. For each polarization 496 elements have been used to...

In this work a novel combination of printed electronics using conductive nanoparticle ink together with 3D printing dielectric material is presented as one integrated process. This allows fabrication complicated electromagnetic (EM) structures such wide range different antennas and microwave devices to simultaneously include within configurations. Characterization polymer based substrate has been done ensure proper RF, electric, thermal mechanical performance both the ink. A meander line...

A novel double-layered vertically stacked substrate integrated waveguide leaky-wave antenna (SIW LWA) is presented. An array of vias on the narrow wall produces leakage through excitation TE10 fast-wave mode waveguide. Attenuation and phase constants leaky are controlled independently to obtain desired pattern in elevation. In azimuth, top bottom layers radiate independently, producing symmetrically located beams both sides broadside. new near-field analysis single LWA performed determine...

This paper describes a new approach for the theoretical design of unequal multisection Wilkinson power dividers, using single-layer microstrip lines. Similar to most structures, presented divider can provide broadband performance. To guideline, closed-form formulas are derived with odd or even number sections. In each case, various simulations have been conducted investigate performance dividers over frequency band. For experimental verifications, two 1:2 center 1 GHz fabricated, having...

This paper proposes a new design method to achieve adverse-resistant microwave sensors using balanced structure of two sensors. Any kinds can be used in the presented architecture. However, kind high-resolution material sensor, based on injection locking phenomenon, is and this paper. By injecting low-power level low-phase noise signal an oscillator, injection-locked oscillator with very small lock range achieved high sensitivity its resonator condition. In structure, for standard sample...

The purpose of this paper is to present a robust and fast beamforming algorithm for the low-cost mobile phased array antennas. proposed uses sequentially perturbation gradient estimation method update control voltages phase shifters, with objective maximizing received power by array. This does not require either knowledge shifter characteristics or signal direction-of-arrival. Moreover, in paper, parameters are derived stationary platform configurations. For array, it shown how proper...

A MEMS-tunable beam-shaping half phase-gradient (HPG) resonant cavity antenna (RCA) is presented. Traditionally, the full (FPG) partially reflective surface (PRS) used in center-fed RCA for generating asymmetric off-broadside beams. Here, novel configuration of HPG-PRS offered with advantages faster real-time tracking and an improved scan profile compared to FPG-PRS. designed 12 - 50° off broadside frequency also steer its beam 69° at fixed frequency. Finally, tunable PRS unit cell required...

In this letter, a new study on the theory and design of dual-band dual-polarized high-gain resonant cavity antenna (RCA) is presented. The RCA includes two layers orthogonal dipole arrays each located at designated height above ground plane microstrip patch antenna. A prototype fabricated, measured results confirm theory. has lower-band gain 19.6 dBi with vertical polarization (V-pol) 10 GHz upper band 18 horizontal (H-pol) 11.6 GHz. cross (Xpol) better than -27 dB band. It demonstrated that...

A four-way filtering power divider (PD) based on a substrate-integrated waveguide (SIW) is presented. This structure composed of two layers the dielectric substrate. The eighth-mode SIW (EMSIW) technique used to make four cavities in upper In addition, an cavity provided lower To achieve efficient transition between layers, rectangular slots are etched middle metal planes. circular slot top layer EMSIW suppress higher operating modes. prove validity, PD with second-order bandpass response...

The Quadruple Loop (QL) antenna was designed and investigated to deliver a robust body-worn for bio-medical applications. QL is very thin single-layer groundless structure which allows the installation of neighboring electronics sensors need be extremely close epidermis layer. performance proposed antennas three main standards: GSM-900, GSM-1800, Bluetooth low energy (BLE). Radiation pattern measurements were conducted compare their results with simulation counterparts. Moreover, data...

This paper presents a fully combined sensor-antenna transmitter system for sensing relative permittivity of material at microwave frequencies. The transmit (Tx) antenna senses the specimen and loads radio frequency (RF) oscillator which translates to operational carrier signal. At same time, independent data, can be Radio Frequency Identification (RFID) information, are ON-OFF keying modulated over carrier. receiver, demodulator extracts data stream as well recovers using zero-crossing...

In this letter, a compact substrate-integrated waveguide (SIW) notched-septum polarizer is designed, manufactured, and tested. Metalized slots are used instead of vias in proximity to the notches improve polarization purity. An impedance matching bandwidth 7.9% at 29 GHz transmission coefficient better than -1.6 dB demonstrated. The axial ratio less 3 over 4.5% (sufficient for 5G). implementation an array antenna was measured validate its reliability applications. Given performance small...

A novel zero-power wireless sensor architecture is proposed and demonstrated in this paper. The sensor, which a passive combines UHF RFID capacitive to enable reading of physical chemical parameters wirelessly, without compromising much on the read-range, complexity conventional tags. alters phase backscattered signal, detected at receiver using non-coherent IQ demodulator. Due universal nature architecture, any type such as temperature, humidity, water level can be realized. For sake...

In this article, a novel batteryless wireless sensor design is proposed and demonstrated. The passive node integrates ultrahigh-frequency (UHF) radio-frequency identification (RFID) chip, filter, reactive to enable the reading of environmental conditions wirelessly, without increasing complexity typical RFID chip substantial loss read range. changes phase reflected signal based on sensed parameter; whereas, filter helps in resolving any ambiguity that may arise due placement at different...

This letter describes the concept, design, and measurement of a low-profile integrated microstrip antenna for dual-band applications. The operates at both GPS L1 frequency 1.575 GHz with circular polarization 5.88 vertical linear dedicated short-range communication (DSRC) application. is low profile meets stringent requirements on pattern/polarization performance in bands. design procedure discussed, full measured data are presented.

This letter introduces a new class of miniaturized reflectarray unit cells with increased phase swing employing Minkowski fractal-shaped patch-slot elements. Square, 1st Minkowski, and 2nd fractal patches are designed as cell. A slot variable lengths 0 <; L <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">s</sub> 6 mm is used in the ground plane to perform variation function. The resonant frequency corresponding maximum reduced from 10.6 GHz for...

Ultrawideband (UWB) synthetic aperture radar (SAR) as a tool for oil well perforation monitoring is experimentally investigated in this paper. Experiments are conducted on lab prototype that emulates the small section of an well. Oil perforations scanned using designed UWB system different experimental conditions. High-resolution images both down-range and cross-range obtained by pulses signal processing. High-quality constructed SAR processing algorithm with proposed modifications. carried...

Efficiency enhancement techniques for high-power amplification systems are now mature technologies, with Doherty power amplifiers (PAs) being widely used in field-deployed wireless base stations. A typical PA consists of two parallel (a carrier amplifier, biased class-AB, and a peaking class-C), an input analog splitter, nonisolated output combiner. The operation the is based on active load modulation mechanism, which allows to operate into optimal load-impedance trajectories that vary...

This study addresses the modelling of a dual band (28 and 38 GHz), circularly polarised slotted-patch-antenna for highly demanded millimetre wave multi-input multi-output (MIMO)-systems in fifth generation (5G) networks. A computer-aided-design model is derived by means an artificial neural network (ANN) which allows obtaining physical dimensions single-fed antenna, satisfying both near- far-field goals, without resorting to time-consuming electromagnetic simulation. mathematical can be...