A compact multiple-input–multiple-output (MIMO) antenna is presented for ultrawideband (UWB) applications with band-notched function. The proposed composed of two offset microstrip-fed elements UWB performance. To achieve high isolation and polarization diversity, the are placed perpendicular to each other. parasitic T-shaped strip between radiating employed as a decoupling structure further suppress mutual coupling. In addition, notched band at 5.5 GHz realized by etching pair L-shaped...

Different from the conventional phased array, frequency diverse array (FDA) can provide electronic beam scanning without phase shifters and its steering is range-angle-dependent. Nevertheless, reported studies on FDA are most in continuous waveforms corresponding beampattern time-variant, which increases difficulty controlling mainbeam direction complexity of signal processing. To alleviate this problem, a pulsed-FDA proposed with an aim to generate quasi-static communication. The constraint...

A miniaturized two-element microstrip antenna array is proposed for the millimeter-wave band of fifth generation (5G) wireless communication systems. surface electromagnetic bandgap structures (EBG) applied as ground two closely packed patch antennas operating in 5G New Radio (26 500-29 500 MHz) frequency band. With help EBG ground, E-shaped elements can be placed close proximity to each other by 0.3 wavelength center distance free space at frequency, yet mutual coupling between them still...

In this paper, a miniaturized fully inkjet-printed flexible multiple-input-multiple-output (MIMO) antenna for ultrawideband (UWB) application is proposed, occupying compact size of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$22\times 31\times 0.125$ </tex-math></inline-formula> mm <sup xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> . the proposed antenna, two half-planar radiators are introduced to...

An extremely broadband circularly polarized (CP) antenna is presented. The proposed consists of a crossed bowtie dipole loaded with four unequal parasitic cross slots, patches, and rectangular strips. slots can generate CP mode due to the sequential phases dipole. patches are gap-coupled two arms dipole, they sequentially rotated along diagonals an additional mode. strips also one configuration parallel By properly combining modes operation achieved. experimental simulated results in...

A compact low-profile reconfigurable metasurface (MTS) antenna is presented in this letter, occupying an overall size of 0.65λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> × 0.067λ . The proposed mainly composed a 3 square MTS, ring-shaped pixel structure, microstrip patch, metal ground plane, and simple feeding network. Through the characteristic mode analysis, two orthogonal degenerate modes are excited to realize linear...

In this paper, a novel hybrid algorithm based on artificial bee colony (ABC) and differential evolution (DE) called ABC-DE is proposed to inherit their advantages overcome drawbacks. algorithm, employed bees employ the mutation crossover strategies of DE enforce exploration ability while onlooker keep original updating strategy retain exploitation ability. Classical test functions have been provided testify algorithm. Furthermore, applied different types time-modulated arrays (TMAs) pattern...

A broadband artificial material composed of non-resonant parallel-line unit cells is proposed to enhance the gain an antipodal tapered slot antenna (ATSA). The material, whose effective refractive index lower than that substrate on which printed, will act as a regular lens in beam focusing. In order investigate enhancement effect combination with ATSA made by locating front antenna. Simulation results indicate has been enhanced significantly and increasing dimension radiation direction leads...

This letter presents a broadband cavity-backed circularly polarized (CP) crossed-dipole antenna encircled by novel asymmetrical cross-loop. By using the single parasitic cross-loop, has simple structure and compact configuration. More importantly, it produces additional two CP modes. The suitable combination of crossed dipole crossloop provides operation. measured results show that proposed with an overall dimension 1.1λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

A broadband surface-wave antenna with a monopole-like radiation pattern is presented. The provides wide bandwidth by two techniques, including the utilization of novel nonuniform tapered metasurface that has smaller inner rectangular patches for exciting resonant modes TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> and xmlns:xlink="http://www.w3.org/1999/xlink">02</sub> simultaneously, reduction ground-plane size constructively...

In this paper, we propose an equivalent transmit beamforming method in joint range and angle domains at the receiver of colocated transmit-receive system where frequency diverse array (FDA) acts as antenna. FDA employs a small offset across elements introduces additional degrees-of-freedom domain, which can significantly enhance flexibility. However, beampattern conventional is range-angle-time dependent. work, time-varying problem first solved by using series filters mixers receiver....

In this letter, transmitting metasurface using single dielectric substrate for orbital angular momentum (OAM) generation is presented in Ku-band. A dimension extension method introduced designing the unit cell of proposed to achieve required phase shift and transmission magnitude generating OAM. prototype fabricated measured. Measured results suggest that can generate OAM vortex wave at 18 GHz. The be applied wireless communication systems requiring low-profile transmitted generator.

This paper presents a bandwidth-enhanced, low-cost, compact, inkjet-printed multilayer microstrip fractal patch antenna for integration into flexible and conformal devices. The consists of two layers patches, with the first layer directly on 0.125-mm (only 0.005 operating wavelength) Kapton polyimide substrate. On top it, 0.12-mm-thick SU-8 polymer is covered. To achieve desired miniaturization good impedance match, Minkowski geometry employed as second polymer. proposed has compact...

A novel dual-band reflectarray comprising crossed-dipole elements and frequency selective surface (FSS) printed on both sides of a dielectric substrate is presented. The FSS function used as reflective ground plane. Compared to the backed by solid ground, FSS-backed could minimize coupling between cell two bands. prototype prime-focus has been fabricated measured. All simulation measurement results demonstrate that structure decreased mutual good performance.

A novel wideband circularly polarized antenna for S-band satellite communications with wide beamwidth is presented. The impedance bandwidth achieved by using the modified inverted-L feeds and stacked patches. obtained semi-open metal cavity. prototype of implemented, measured 30.1% reflection coefficient <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$\leq \hbox{-}10~\hbox{dB}$</tex> </formula> ,...

A novel and compact tri‐band microstrip‐fed monopole antenna with dual‐polarisation characteristics for wireless local area network (WLAN) worldwide interoperability microwave access (WiMAX) applications is proposed. The composed of a partial ground Y‐shaped radiating patch that consists two unequal arms modified circle monopole. able to generate three separate impedance bandwidths cover the frequency bands WLAN (2.4–2.484 5.8 GHz) WiMAX (3.4–3.7 GHz). In addition, circularly polarised in...

A compact and low-profile omnidirectional circularly polarized (CP) antenna with four coupling arcs is presented. In this structure, outer are utilized to generate horizontal polarization, an inner disk-loaded feeding pin can produce vertical polarization. Thus, CP radiation achieved by combining the from pin. Four shorting pins employed at end of arcs, which play a great role on miniaturization antenna. Furthermore, antenna's dimensions be reduced more loading inside arcs. An L-band...

In this paper, a balanced-to-balanced in-phase filtering power divider (FPD) is proposed, which can realize two-way equal division with high selectivity and isolation. The design of the proposed FPD primarily based on microstrip/slotline transition structures slotline T-junction. A U-type microstrip feed line integrated stepped-impedance resonator adopted at input output ports, makes differential-mode (DM) responses independent common-mode (CM) ones. Meanwhile, superior DM transmission CM...

A novel broadband high gain vertical planar printed antenna is presented. The proposed composed of a bowtie-shaped electric dipole, loop that works as magnetic microstrip-to-coplanar stripline transition balun, and the H-shaped resonator (HSR) structures are used for enhancement, all which in same plane perpendicular to ground. Prototypes HSR-loaded unloaded one were fabricated measured. Analyses comparisons made. has wide impedance bandwidth 51.9%, ranging from 2.31 GHz 3.93 stable about...

The design of multi‐band bandpass filters (BPFs) employing stub loaded stepped‐impedance resonator with defected microstrip structure (SL‐SIR‐DMS) is presented in this study for the first time. proposed SL‐SIR‐DMS created by embedding DMS on low‐impedance line SL‐SIR. It found that different structures can lead to frequency responses. In addition, using DMS, tri‐band and even quad‐band responses be easily achieved without increasing size. As verification, one are designed analysed...

This paper presents a novel broadband phase-shifting surface (PSS) element with frequency-selective (FSS) backing, which could independently control the phase of transmitted/reflected waves at high/low frequencies. Using appealing features basic building block, high gain planar array antenna is designed and implemented by employing set these spatially varied elements. Fed Vivaldi antenna, fabricated composed 9 × elements, each carefully to exhibit desired transmission/reflection Numerical...

A novel flat lens antenna using double-ring slot element is presented. Compared to those conventional high-gain antennas, the proposed can realize greater flexibility in installation with less manufacturing complexity. prime-focus 49-element prototype elements has been fabricated and measured. The highest measured gain 16.7 dBi at center frequency of 6 GHz, a relative bandwidth 15% achieved within 3-dB variations. All experimental results demonstrate that be used as an optimum airborne future.

Summary Chewing‐side preference ( CSP ) may be associated with temporomandibular disorders. However, little information exists regarding whether will lead to osseous changes of joint TMJ in asymptomatic participants. The aim this study was investigate the relationship between morphology participants and without . Of 121 healthy dentate participants, 35 left , 38 right other 48 were scanned by cone‐beam computed tomography. dimensions reconstructed images opposing s compared. Statistical...