A two-layer higher-order-mode circularly polarized (CP) rectangular dielectric resonator antenna (DRA) is proposed at a frequency range of 10-13 GHz using single feed. The configuration incorporates the DRA and coat layer with respective constants 10 3.5. Utilizing outer offers number advantages such as wider impedance CP bandwidths ~21% 9.5%, respectively, well high gain ~11 dBic. close agreement has been achieved between experimental simulated results.

A compact multiple-input-multiple-output (MIMO) dielectric resonator antenna (DRA) that is suitable for internet of things (IoT) sensor networks proposed with reduced coupling between elements. Two rectangular-shaped DRAs have been placed on the opposite sides a Rogers substrate and each fed using coplanar waveguide (CPW) feed slots etched in dedicated metal ground plane located under DRA. Moreover, locating elements at has improved isolation by 27 dB without need to incorporate additional...

A rectangular dielectric resonator antenna (DRA) with a broadband circular polarization (CP) radiation is presented using single feed excitation. simple method proposed an open half-loop that consists of three metallic strips. Utilizing such excitation has provided over bandwidth 7% been increased further to 13% by adding concentric parasitic in the structure. This achieved conjunction 20% impedance matching same frequency range. The configuration rigorously modeled moments (MoM) model....

A novel quasi-twisted miniaturized wideband branch line coupler (BLC) is proposed. The design based on bisecting the conventional microstrip BLC transversely and folding bisected sections double-layered substrates with a common ground plane in between. input output terminals, each length of λg/4, pair quarter-wavelength horizontal parallel arms are converted into Z-shaped meandered designed structure. Conversely, vertical halved two lines transformed periodically loaded slow-wave parts...

A recently discovered rare-earth copper-oxide material, which is superconducting above the temperature of liquid nitrogen, used to fabricate a high-efficiency electrically short dipole antenna. Thus necessity cool lead antenna structure helium temperatures avoided. Results are presented show gain enhancement achieved using this new material when compared with conventional copper at room temperature.

In the paper, an extremely compact multiple-input-multiple-output (MIMO) antenna is proposed for portable wireless ultrawideband (UWB) applications. The prototype consists of four monopole elements, which are placed perpendicularly to achieve polarization diversity. addition, mutual coupling between elements suppressed by designing gap radiation element and ground plane. Moreover, a matching stub has been connected feedline ensure impedance in high frequency. Both simulated measured results...

A rectangular dielectric resonator antenna (DRA) that is excited using an outer-fed square spiral strip has been studied theoretically and experimentally. Utilizing such excitation provided a circular polarization over broad bandwidth of ~14% in conjunction with impedance-matching ~11%. The structure rigorously modeled method moments (MoM) model. good agreement attained between computed measured results.

A GaAs-based epitaxially regrown photonic crystal surface-emitting laser is proposed and demonstrated at room temperature. The band-structure mapped through the angular dependence of subthreshold electroluminescence, allowing coupling coefficients to be determined.

A flexible and totally wearable textile antenna is proposed by embroidering the conductive threads into garments. purely polyester substrate has been utilized, which provides a tag that can be easily integrated with clothes. The small dimensions of 72 × 20 2.75 mm3 offers an enhanced performance in terms gain stability when worn on different body locations. Experimental results demonstrate improved impedance matching owing to elasticity E-shaped inductive feeder. Close agreement achieved...

This article delves into the capabilities of 3D-printed millimeter-wave (mmWave) layered cylindrical dielectric resonator antennas (CDRAs). The proposed design yielded promising results, boasting a remarkable 53% impedance bandwidth spanning frequency spectrum from 18 to 34 GHz. Furthermore, axial ratio (AR) achieved an impressive 17%, coupled with maximum gain 13.3 dBic. These notable results underscore efficacy design, positioning it as viable solution for applications in Beyond 5G (B5G)....

The realization of all-semiconductor epitaxially regrown photonic crystal (PC) surface-emitting lasers is reported. PC coupling strengths, band structure, optimization epitaxial regrowth, and operating characteristics are discussed. Room temperature operation allows agreement between theoretical experimental structure to be confirmed.

The realization of a 1 × 2 coherently coupled photonic crystal surface emitting laser array is reported. New routes to power scaling are discussed and the electronic control coherence demonstrated.

A unified method of moments model is developed for the analysis arbitrarily shaped antennas that are radiating next to a multilayered dielectric sphere. The curvilinear Rao-Wilton-Glisson triangular basis functions and dyadic Green's have been used in model. Antennas various geometries including spherical, circular rectangular microstrip as well hemispherical resonators modeled. Input impedance radiation pattern results presented shown be good agreement with published data.

A conformal spiral wire has been used to feed a dielectric resonator antenna obtain circular polarization. The parameters of the have optimized numerically so that minimum axial ratio (AR) and return losses are achieved. method moments (MoM) in analysis results validated against those from commercial software package with good agreement.

Asymptotic expressions are derived for the dyadic Green's functions of antennas radiating in presence a multilayered cylinder, where analytic representation asymptotic expansion coefficients eliminates computational cost numerical evaluation. As result, extraction technique has been applied only once large summation order. In addition, Hankel function singularity encountered source and evaluation points at same radius eliminated using analytical integration.

An efficient algorithm is introduced to enhance the convergence of dyadic Green's functions (DGF) in a layered spherical media where asymptotic expressions have been developed. The formulated involve an infinite series eigenmodes that can be reduced simple homogenous function using addition theorem Hankel functions. Substantial improvements speed attained by subtracting representation from original DGF. subtracted components are then added solution format.

In this paper we describe elements of photonic crystal surface-emitting laser (PCSEL) design and operation, highlighting that epitaxial regrowth may provide advantages over current designs incorporating voids. High coupling coefficients are shown to be possible for all-semiconductor structures. We introduce type I II crystals (PCs), discuss the using each. discussed band structure as a function atom volume circular on square lattice. Additionally explore effect PC size has in-plane...

This paper presents a novel 28 GHz circularly polarized rectangular dielectric-resonator antenna (DRA) array for millimeter-wave (mmWave) off-body applications. A feed network incorporating cross slots was utilized in the DRA design to realize circular polarization (CP). In terms of free-space wavelength, λo, dimensions were (0.48λo × 0.48λo 0.27λo) at GHz. The simulated by dielectric layers with parameters that are equivalent those human body desired frequency communications. Moreover,...

A method of moments model is presented to analyze Archimedean spirals that are printed on a layered dielectric sphere. The derived assuming an arbitrary location the spiral. Input impedance, current distribution and far-field results shown be in good agreements with other methods.

A slot fed terahertz dielectric resonator antenna driven by an optimized photomixer is proposed, and the interaction of laser studied. It demonstrated that in a continuous wave photomixing scheme, generated THz power proportional to 4th surface electric field photocondutive layer. Consequently, optical conversion efficiency proposed has enhancement factor 487. This due fact with 2D-Photonic Crystal (PhC) superstrate been improved from 2.1 9.9 V/m, which represents substantial improvement....

A wideband hemispherical dielectric resonator antenna (DRA) with enhanced gain is proposed for a frequency band of 20 to 28 GHz. The precise alignment and assembly the DRA represent key challenges at such frequencies that were addressed using three approaches: first was based on outlining position ground plane, second involved creating groove in compound plane which placed, third 3D-printing perforated substrate. In all cases, same utilized excited higher-order mode an annular ring slot....

This research is an attempt to highlight that the presented antenna design proposed for modern wireless communication systems, including 5G networks. The structured realize a reconfigurable terminal suit smart systems. Therefore, from twelve-unit cells of metamaterial (MTM) inclusions. For this, effectively, profile reduced 0.21λ0, where λo free space wavelength at 2.45GHz, which occupies 40 × 30 mm2 equivalently. accomplished by using T-resonator inductors conduct 3rd iteration...

This paper introduces an innovative and cost-effective approach for developing a millimeter-wave (mmWave) frequency-reconfigurable dielectric resonator antenna (DRA), which has not been reported before. The integrates two rectangular DRA elements, where each is centrally fed via slot. A strategically positioned PIN diode employed to exert control over performance by modulating the ON–OFF states of diode, thereby simplifying design process reducing losses. In OFF state, first DRA, RDRA-I,...

A Rectangular Dielectric Resonator Antenna (RDRA) design for mmWave-frequency-band MIMO metrics is proposed, with a compact, low-complexity, high-gain structure that easy to fabricate and offers reduced inter–port isolation. The RDRA operates in the mmWave spectrum, featuring compact size of 1.307λ0 × 1.307λ0, an impedance bandwidth 6%, resonant frequency 28 GHz, peak gain 7 dBi. four element system iteration was developed while maintaining performance single antenna. Additionally, simple,...