In this letter, a novel method of reducing mutual coupling is proposed, and it used on modified compact broadband antipodal Vivaldi antenna (AVA) array for future 5G millimeter-wave (mmWave) communication application. The proposed structure consists eight elements that are fed by 1-to-8 power divider. order to reduce the between AVA elements, multiple notch structures added ground plane. Thus, isolation can achieve maximal additional 37.3 dB enhancement, impedance bandwidth extended slightly...

A single-fed dual-band dielectric resonator antenna (DRA) with orthogonal circular polarizations (CPs) in <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">K</i> - and xmlns:xlink="http://www.w3.org/1999/xlink">Ka</i> -bands is proposed for satellite communications on unmanned aerial vehicle (UAV). The overcomes the challenges of dual-CP operation, narrow axial-ratio bandwidth (ARBW) antennas, limited payload space UAVs. shared-aperture...

In this paper, a compact substrate-integrated waveguide (SIW) cavity-backed slot antenna array with high gain, broadband, and dual-polarization performances is proposed for 60-GHz applications. An enhanced 17.1% impedance bandwidth was achieved by cutting semi-circle edges on the conventional radiator. A simplified SIW feed network aperture-coupled vertically constructed double-layered structure to implement operation. By adopting innovative techniques both radiating element networks,...

Properties of one-dimensional graphene photonic crystals with dual-layer defects are studied. Results show that two defect modes appear within the gaps, and shift to lower frequencies chemical potential increasing, physical mechanism also given based on relative dielectric constant graphene. It is found frequency, magnitude, numbers can vary symmetrical changes dual-defect layers. For oblique incidence, TE polarization follow a similar trend TM polarization, all higher disappear while new at...

In this communication, a rectangular dielectric resonator antenna (DRA) is integrated with backed cavity to enlarge the DRA side length by 1.8 times. The also reduces sensitivity of resonance size, resulting in relaxed fabrication tolerance. Based on enlarged design, stacked (sDRA) proposed improve bandwidth from 8.7% 15% and enhance realized gain an average 1.5 dB. mechanisms are verified fabricating <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...

The function of passive wide-angle beam scanning is desired by the base station antenna to provide "green" cellular services. In this communication, such realized designing a compact phase-controlled pattern-reconfigurable dielectric resonator (DRA). proposed DRA has structure with side length 0.38 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> and excites fundamental TE TM modes diverse ports. By assigning phase between ports,...

3D printing of antennas on removable fingernail for on-body communications at microwave and millimetre waves is proposed. Aerosol Jet technology, a fine-feature material deposition solution, has been used to directly print microstrip patch an acrylonitrile butadiene styrene (ABS) finger nail substrate. Two have printed assessed, one operating 15 GHz the other 28 GHz. Nanoparticle conductive silver ink employed create corresponding transmission line using Optomec machine. The inks are then...

A compact printed planar antipodal Vivaldi antenna (AVA) array with high gain is presented. First, a novel method based on adding line-type defected ground structures (DGSs) between adjacent elements utilized to reduce the mutual coupling in AVA array. It accompanied by reduced cutoff frequency and improved simultaneously. Second, inconsistent performance edge center can be decreased pair of semiring-shaped DGSs edges Thus, directivity improved. Third, impact back-end systems, multiple...

In this paper, a novel substrate integrated waveguide (SIW) filtenna with two controllable radiation nulls is proposed, which has the advantage of good characteristics. Radiation are generated by electric and magnetic mixed coupling structure fundamental mode, respectively. And quasi-elliptic characteristic can be obtained at boresight gain direction. By changing length perturbation slot strength coupling, position controlled independetly. Compared to conventional filtenna, proposed SIW no...

We present a portable pattern-reconfigurable dual-polarized dielectric resonator antenna (DRA). Low-cost gallium arsenide (GaAs) single-pole, double-throw (SPDT) switches are utilized to select one of the feedline paths DRA, giving boresight or cardioid pattern electronically. The measured results verify proposed its radiation patterns between and shape, without significantly affecting matching in operating frequency range 5-6 GHz. Results also confirm that configuration port with...

An investigation of the use Aerosol jet 3D Printing frequency selective surface for millimetre and low-THz applications is presented in this article. This printing technique allows fabrication intricate details designs with high resolution. Band-stop band-pass FSS are designed tested. The band stop consisted a Square loop array that operated 26-28 GHz sub-millimetre band. design printed on glass substrate can be used deployment windows. bandpass arrays simple slot elements arranged square...

Running-out detection of the liquids in an infusion bag is important for medical treatment. This paper proposed a simple low-cost sensing scheme with artificial magnetic conductor (AMC) antenna liquid-running-out bags. The consists dipole supported by AMC layer. It operates 2.4 GHz ISM band without-liquid state, 2.0 with-liquid and can be used liquid sensing. layer isolates interference from surrounding environment such as standing pole. also enhances performance improves monitoring...

This communication proposes a wideband circular-polarized (CP) beam steering dielectric resonator antenna (DRA) using gravitational ball lens. It offers passive means for wall or ceiling mounted base station antennas to adjust their patterns by the gravity of lenses. novel concept overcomes difficulties achieving axial ratio versus pattern reconfigurability existing antennas. The operation lens has been intensively studied. is found that provides 1.2 dB gain enhancement, whereas enabling...

In this paper, a high-gain low-sidelobe circular-shaped monopulse antenna array operating in W-band is proposed. The distributed on circular aperture, which maximizes the usage efficiency of area and suitable for mounting rotating platform with limited space. By loading dielectric waveguide, more radiating slots can be arranged same physical length as compared to hollow beneficial suppress sidelobe level. feed network sum-difference are placed different layers reduce overall size antenna....

A millimeter-wave wideband circularly polarized (CP) horn antenna with no requirement of an orthogonal mode transducer feeding is reported. The has a simple structure, which consists antipodal curvedly tapered slot and circular waveguide. CP principle the explained. series parametric studies was carried out to estimate effect key parameters, design procedure also presented. measured results are in reasonable agreement simulation results. experimental indicate that proposed can achieve...

A differentially fed duplex filtering dielectric resonator antenna (DFDRA) is proposed. This DFDRA combines the functions of duplexer, filter and into one highly integrated multifunctional module. dual-mode substrate waveguide (SIW) cavity working as common feeding structure operates at two orthogonal modes lower higher channel by pairs differential input ports. The DRA radiation element channels respectively excited cross slots etched on top SIW cavity. High-isolation between realized due...

In this communication, a low-profile circularly polarized (CP) staircase curl antenna array with 2:1 impedance bandwidth and 50&#x0025; axial ratio (AR) is proposed for fifth-generation (5G) millimeter-wave (mmW) communications. It overcomes vital drawback of complex multilayer structure the wideband CP array. By fully taking advantage 3-D layout, element achieves bandwidth, 57.9&#x0025; AR maximum gain 7.4 dBic. Accordingly, benefiting from tapered matching transformer, single-layer...

Abstract Scheelite structure phase inorganic oxides show their irreplaceable role in numerous application areas due to clear and superior properties, especially dielectrics. BiVO 4 has been permanently studied but substitutions, modifications, explorations of novel phases persist hitherto inspire more interest. In this work, we report a Bi(Ge 0.5 Mo )O detailed study both structural analysis dielectric properties investigation. adopts the monoclinic structure, identical , with permittivity ∼...

Abstract Phthalonitrile monomer containing oxazine ring (BPS‐Ph) was synthesized using bisphenol‐S, aniline, paraformaldehyde, and 4‐nitrophthalonitrile via a two‐step method. The differential scanning calorimetry (DSC) data of the curing process BPS‐Ph indicates that peak polymerization temperature cyan group is about 250°C confirms promoting effect on reaction phthalonitrile. rheological E51/DDS also has process. activation energy studied iso‐conversional method principle. corresponding to...

In this paper, a novel pattern-diverse technique to enhance the coverage of broadband high-gain millimeter-wave (mmW) antenna is proposed for Unmanned Aerial Vehicle (UAV) communications. It overcomes limited mmW array, and low radiation efficiency multi-beam array. This enables radiate two isolated beams with different tilted angles, which can effectively increase UAV without enlarging size or degrading efficiency. For demonstration, an 8 × array designed 11° 23° from 6° 28°. Measured...

A circular aperture box-horn array antenna operating in W-band, with sum and difference radiation beams, is presented this paper. The provides maximum usage efficiency of the area, which well suited for a rotational platform. Nonuniform power distribution applied radiating elements, contributing to pattern suppressed sidelobe. In order fit into aperture, feed networks are optimally arranged on compact two-planar layer four quadrants fed by sum-difference network. array, along its...

A longitudinally miniaturized H-plane horn antenna with suppressed sidelobes by redistributing the field on radiating aperture is proposed loading a few rectangular blocks. The substantial longitudinal length reduction (around 50% of an optimal horn) will cause nonuniform phase and nontapering magnitude distributions electric fields aperture, resulting in high decreased gain. Four pairs blocks perturbing are loaded near realizing redistribution for tapered distribution relatively uniform...

A method to reduce one direction width of the circularly polarized antipodal curvedly tapered slot antenna, while maintaining wide axial ratio (AR) and impedance bandwidth endfire radiation, is proposed in this letter. In method, ridge structure broad wall slotted waveguide used increase current path, which makes antenna achieving appropriate phase difference orthogonal electric fields within narrow width. To validate a prototype was fabricated measured. Experimental results show that can...