An efficient mutual coupling reduction method is introduced in this letter for extremely closely placed dual-element microstrip antennas positioned on a finite-sized ground plane WLAN MIMO application at 5.8 GHz. High isolation can be achieved through simple slot structure the between antennas. The position, length, and width of have been optimized maximizing isolation. It found that more than 40 dB two parallel sharing common plane. space distance these 17.5 mm ≈ 0.33λ <sub...

A novel single-fed low-cost wideband and high-gain slotted cavity antenna based on substrate integrated waveguide (SIW) technology using high-order modes is demonstrated in this paper. High-order resonant (TE130, TE310, TE330) inside the are simply excited by a coaxial probe which located at center of antenna. Energy coupled out 3 × slot array etched top surface cavity. Two antennas with different polarizations designed tested. Measured results show that linearly polarized prototype achieves...

This paper presents a scalable 1024-element transmit dual-circularly-polarized phased array for Ka-band satellite communication (SATCOM) terminal applications. The based on the CMOS beamformer and multilayer printed circuit board (PCB) can steer up to large scan angles (±60°) with loss less than 4.5 dB. With 8-channel beamformer, realize dual circular polarization axial ratio (AR) of is 3 dB in scanning range ±30° both left-hand (LHCP) right-hand (RHCP) mode. effective isotropic radiated...

The radio frequency identification (RFID) has emerged Internet of Things (IoT) into the things. This paper presents, a low-cost smart refrigerator system for future IoT applications. proposed is used automatic billing and restoring beverage metallic cans. cans can be restored by generating product shortage alert message to nearby retailer. To design low-profile tag antenna items very challenging, especially when mass production required item-level tagging. Therefore, novel ultrahigh (UHF)...

In this paper, we propose a new phased array calibration method that measures all antenna element excitations simultaneously. The has the minimum number of measurements among known similar methods. auxiliary used for measurement is placed in either near-field or far-field region to receive complex signals during change phase settings. According superposition principle electromagnetic field, set linear equations concerning are created with measured signals. With scattering parameters between...

A novel amplitude-only measurement method is proposed to measure the signals (complex fields) of individual antenna elements for phased array calibration. The has minimum measuring time among known methods. total number power measurements with this about twice array. Phase shifters are required implement only three phase shifts (0°, 90°, and 180°). Array signal measured when setting an element one shifts. According superposition principle electromagnetic field, a linear combination signals....

This paper presents a low-cost, inkjet printed radio frequency identification (RFID) tag antenna for remote healthcare applications. The electrically small consists of nested-slot configuration and parallel strips. is exploited as sensor by modifying its equivalent circuit to mitigate the effects water, blood sample phantom, human body. As result, proposed RFID with compact dimensions 40 × 14 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

A novel design of the passive license plate radio frequency identification tag antenna in UHF band based on characteristic mode theory (CMT) is proposed this paper. The operated as a since it conductor (made aluminum). desired up-tilted pattern beam achieved successfully by using direct CMT-based radiation synthesis procedure. can be expanded superposition some specific modes pattern, which identified according to analysis plate. Four coupling slots are exploited excite selected current...

This paper introduces a hybrid genetic algorithm and particle swarm optimization (GA-PSO) dedicated to pattern synthesis of conformal antenna arrays. Taking advantages both methods, the proposed GA-PSO has fast convergence speed high accuracy when applied array synthesis. To show performance algorithm, several typical test functions examples linear are illustrated. Finally, 4 × 2 cylindrical microstrip as practical example is studied demonstrate algorithm. The simulated measured results have...

A novel low‐profile single‐fed circularly polarised single‐layer metasurface antenna for wideband operation is proposed in this Letter. The consists of nine unit cells arranged a 3 × layout. Four slits are incorporated into four them, respectively, to form two orthogonal currents with 90° phase difference; hence, fields excited. Moreover, modified L‐type slot etched on the middle lattice improve impedance bandwidth and axial ratio performance. dielectric‐filled ( ɛ r = 3.5, tan δ 0.001) low...

Abstract This paper presents a block-chain enabled inkjet-printed ultrahigh frequency radiofrequency identification (UHF RFID) system for the supply chain management, traceability and authentication of hard to tag bottled consumer products containing fluids such as water, oil, juice, wine. In this context, we propose novel low-cost, compact UHF RFID antenna design liquid bottles, with 2.5 m read range improvement over existing designs along robust performance on different bottle products....

A six-port multiple-input-multiple-output (MIMO) antenna system with high port isolation for 5-GHz WLAN access points application is proposed in this letter. It consists of three vertically polarized and horizontally elements alternately mounted on a pyramidal metal structure. Several techniques are used to improve the performances system, including aperture-coupled feeding mechanism, quarter-wavelength chokes, parasitic grooves. Measured results show that more than 45 dB can be obtained...

The Internet of Thing (IoT) and fifth-generation mobile communication networks (5G) are leading towards a paradigm shift by proving seamless connectivity to large number devices.The applications IoT in smart cities have further attracted local authorities adopt technologies such as driverless cars, parking waste management.This paper presents compact base station antenna design with enhanced directivity/gain for ultra-wideband (UWB)/5G embraced real-time location systems (RTLS) based...

This letter presents a novel circularly polarized ultra-high frequency radio identification (902-928 MHz) tag antenna design for metallic poles using characteristic mode analysis (CMA). The traditional tags are usually mounted on the surface of pole, which is vulnerable position mounting since it can be easily broken or anyone remove from pole surface, whereas proposed placed chassis with cut through center tag. According to CMA, conical radiating will not so effective in our application...

This paper presents a novel dual polarised tag antenna design for ultra-high frequency radio identification (UHF RFID) featuring polarisation or band diversity using characteristic mode analysis. The proposed consists of two meandered line bowtie dipole-like structure (resembles with planar pyramid), shorting stubs, and ground plane. initial comprises an upper patch wrapped around FR 4 substrate shorted from all side to plane stubs. After running the analysis design, diagonal slots are...

A novel embedded element pattern decomposition method is proposed to synthesize conformal phased antenna arrays. This decomposes the patterns as a product of characteristic matrix and Vandermonde structured matrix. composed modes in modal space at sampling angles. Because fast Fourier transform (FFT) algorithm can be used structure, computational cost reduced tremendously. In addition its efficiency, also applicable synthesis with any mainlobe direction optimized polarization. modified...

A low-profile linearly polarized patch antenna using metasurface is proposed for wideband operation at 5-GHz Wi-Fi bands. The comprised of a rectangle sandwiched between lattice 3 × periodic and the ground plane. adopted coaxial probe feed easy to fabricate match. Characteristic mode analysis (CMA) utilized explain understand working mechanism antenna. It found that two dominant characteristic modes are well excited, leading broadband radiation. dielectric-filled with low profile 0.057λ0 (λ0...

Abstract This article presents an RFID system to detect the salinity and sugar contents of water. The proposed is based on low‐cost ink‐jet printed passive ultrahigh frequency (UHF) tag. tag designed using slot match technique, which poses a good imaginary impedance with chip both in free space after mounting water bottle. Moreover, antenna exploited as sensor salt by measuring backscatter power from term received signal strength indicator (RSSI). A Tagformance Pro setup form Voyantic used...

Radio frequency identification (RFID) is a pivotal technology to realize the Internet of Things (IoT) dreams and considered as last-mile solution. Therefore, this paper presents novel compact antenna design for UHF RFID handset with angle-adjustable linear polarization using characteristic mode analysis. The proposed consists multi-orientation dipole partially printed on three sides C shaped F4B substrate an internal ground behind screen. First all, different modes plane are analyzed...

Abstract The space mapping (SM) technique is applied to conformal antenna design for the first time. A planar microstrip printed on a finite ground-plane with coarse-mesh solved as coarse model and aligned placed platform's surface fine-mesh through mapping. When some antennas have same configuration, being able share common an important advantage of this in these optimizations. S-parameters are optimized. function responses example chosen "e S11". comparisons efficiency accuracy commercial...

A new phased array calibration method based on near-field measurement system such as NSI is proposed in this paper. By measuring a single element antenna and near-field, parameter extracted from measured data with twice Fourier Transformation once Inverse Transformation. Both amplitude phase realized by very short time. example of one-dimensional used to validate the method.

The multi-objective optimization NSGA-II approach has been proved that, in most of times, it much better spread solutions and convergence near the true Pareto-optimal than mostly method. But there are also disadvantages to restrict uniformity some problems. This paper overcomes these get three modifications such as cumulate dummy fitness strategy, disconnected filling throwing off strategy by selection limit. comparison with simple shows that great efficiency is achieved using improved...

This letter introduces a novel, inexpensive, and low-insertion-loss switch feeding network for beam steering of antenna array. The proposed uses only single-pole multithrow (SPMT) microwave p-i-n to steer the main different angles with high gains. In theory, arbitrary an number beams can be realized this structure. type is used successfully design 2×3 circular polarization microstrip array, experimental results are presented discussed. Good agreements between simulation testing achieved.

Abstract As a newly discovered evolutionary algorithm, the particle swarm optimization algorithm has been widely used in synthesis of array antennas, while it is seldom nonuniform antennas. Two different antennas are optimized by binary and real this article, which depicts application Lower peak side-lobe level with uniform excitation can be obtained using method. Meanwhile, method minimizing variable-searching space that improve efficiency optimization. Compared standard genetic modified...

This paper presents a novel inkjet-printed near-field ultra-high-frequency (UHF) radio frequency identification (RFID) tag/sensor design with uniform magnetic field characteristics. The proposed tag is designed using the theory of characteristics mode (TCM). Moreover, uniformity current and performance achieved by further optimizing particle swarm optimization (PSO). Compared to traditional electrically small tags, this uses logarithmic spiral as radiating structure. benefit structure lies...