A broadband dual-polarized planar antenna is proposed for 2G/3G/LTE base stations. The composed of two perpendicularly crossed bow-tie dipoles. Each dipole excited by a microstrip stub that directly fed coaxial line, making the full planar. Due to coupling between dipoles, broad bandwidth achieved. It shown has 45% (1.7-2.7 GHz) return loss >15 dB with an isolation higher than 30 polarization input ports. half-power beam width (HPBW) around 65 ° and average gain 8.5 dBi slant ±45°...

A broadband vertically/horizontally dual-polarized omnidirectional antenna is proposed for mobile communications. The a combination of modified low-profile monopole vertical polarization (VP) and circular planar loop horizontal (HP). folded patch shorted by four tubes while the consists half-wavelength arc dipoles. achieves bandwidth ~ 25% (1.7-2.2 GHz) with an isolation around 40 dB. gain variations in plane are less than 2.5 dB VP 1.5 HP. An eight-element array developed base station...

A novel dual-broadband planar antenna is proposed for 2G/3G/LTE (4G) mobile communications. The consists of one element the lower band and two elements upper band, making it possible to be arrayed without appearance grating lobes in band. lower-band comprises a pair printed dipoles with parasitic bandwidth enhancement. Two upper-band composed pairs folded are nested inside element, forming compact arrayable unit. achieves 20% (800-980 MHz) 60% (1540-2860 array that 4 8 developed base station...

A novel broadband planar antenna is developed for mobile communication base stations. The composed of a pair folded dipoles which are coupling fed by an L-shaped microstrip line. Both the and line etched on same substrate. achieves bandwidth 53% return loss} > 15 dBi covering frequency range 1.65-2.85 GHz 2G/3G/LTE applications. gain element about 9 dBi. 45° dual-polarized consisting two elements proposed, 50% isolation 30 dB. Two 8-element arrays respectively ${pm}45^{circ}$ antenna....

A novel dual-broadband multiple-input-multiple-output (MIMO) antenna system is developed. The MIMO consists of two elements, each which comprises opened loops: an outer loop and inner loop. acts as a half-wave dipole excited by electromagnetic coupling from the loop, leading to broadband performance for lower band. serves monopoles. combination monopoles higher modes results in upper bandwidths (return loss >;10 dB) achieved element are 1.5-2.8 GHz (~ 60%) band 4.7-8.5 58\%) Two U-shaped...

The bandwidth (BW) of a broadband dual-polarized antenna is enhanced for 2G/3G/4G systems and international mobile telecommunications services. element four-leaf clover antenna. By introducing U-shaped slot to each leaf the parasitic four disks above element, BW enhancement achieved. It shown by simulation experiment that achieves 67% (1.39-2.8 GHz) reflection coefficients <;-15 dB with an isolation (ISO) 30 dB. An eight-element array developed base station applications. has about 70%...

The generation of multimode orbital angular momentum (OAM) carrying beams has attracted more and attention. A broadband dual-polarized dual-OAM-mode uniform circular array is proposed in this letter. antenna array, which consists a bow-tie dipole phase-shifting feeding network, can be used to generate OAM mode -1 1 from 2.1 2.7 GHz (a bandwidth 25%) for each two polarizations. Four orthogonal channels provided by the array. 2.5-m link built. measured crosstalk between matched mismatched less...

In this letter, a dual-band multiple-input-multiple-output (MIMO) antenna array is proposed for portable wireless devices. The MIMO consists of two back-to-back monopoles elements with an edge-to-edge distance 0.096 λ -(λ the free-space wavelength at 2.4 GHz). A shorting strip and isolation stub are designed to reduce mutual coupling between elements. has volume 15 × 50 0.8 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> . It can...

Light-weight antenna arrays require utilizing the same aperture to provide multiple functions (e.g., communications and radar) in separate frequency bands. In this paper, we present a novel element design for dual-band array, comprising interleaved printed dipoles spaced avoid grating lobes each band. The folded are designed be resonant at octave-separated bands (1 2 GHz), inkjet-printed on photographic paper. Each dipole is gap-fed by voltage induced electromagnetically from microstrip line...

A new multiband planar antenna with a compact size is designed and developed for mobile devices. The proposed consists of two-strip monopole meandered strip which occupy area only 15 mm × 42 mm. This has bandwidth ~ 42% at the 900 MHz band 53% 1900-MHz band. wide low frequency attributed to mutual coupling an S-shaped inverted-F are separately printed on two sides thin substrate, forming configuration. high enhanced by inserting improves impedance matching high-frequency experimental results...

A broadband circularly polarized (CP) antenna is developed with an omnidirectional radiation pattern in the horizontal plane. Four CP rectangular loop elements are employed for radiation. The four first printed on a flexible thin dielectric substrate and then rolled into hollow cylinder. conducting cylinder introduced inside achieving desired performance. feeding network consisting of baluns impedance matching circuit designed to feed elements. has circular cross section diameter 0.38 λ <sub...

A broadband dual-polarized omnidirectional antenna is investigated. The proposed dually polarized consists of four vertical dipoles for polarization (VP) and horizontal (HP), which are uniformly printed around a dielectric cylindrical barrel radiation. Two feeding networks employed to excite the dipoles, respectively. achieves bandwidth ~ 30% (1.7-2.3 GHz) with an isolation about 25 dB. gain variations in plane less than 0.5 dB VP 1.5 HP. cross-polarization levels HP -20 has great potential...

It is demonstrated that the bandwidth of circular polarization (CP) can be significantly increased when one more parasitic loop added inside original loop. A single-loop antenna has only minimum axial ratio (AR) point while two-loop create two AR points. An appropriate combination points results in a significant enhancement for CP bandwidth. comprehensive study new type broad-band circularly polarized antennas presented. Several configurations, including loop, rhombic and dual with series...

The radiation performance of patch antennas on a large-size substrate can be significantly degraded by the diffraction surface waves at edge substrate. Most modern techniques for surface-wave suppression are related to periodic structures, such as photonic bandgap (PBG) or electromagnetic (EBG) geometries, which require complicated processes and considerable area. concept artificially soft surfaces has been proposed suppress propagation since 1990s. However, typical corrugated only applies...

A new type of compact dual-band directional antenna is proposed for 2.4/5-GHz wireless access point and RFID reader applications. The consists a longer dipole the lower band pair shorter dipoles upper band. simple coupling microstrip line employed to excite dipoles. Both feeding are printed on same substrate, leading fully planar structure. length shortened by capacitive loading at each end dipole, offering configuration. achieves desirable radiation pattern with an gain near 8 dBi 9-10 An...

A compact multi-broadband planar antenna is proposed for wireless handsets. The covers multiple broad frequency bands, including the 900-MHz band with a bandwidth of 29% (790-1061 MHz), 2-GHz 51% (1650-2775 and 3.5/5-GHz 68% (3132-6382 MHz). consists folded monopole coupling to an S-shaped strip band, C-shaped trapezoidal inverted-F band. All these monopoles coupled strips are printed on substrate size 15 mm×60 mm×0.5 mm, suitable emerging ultra-slim GSM/UMTS/LTE WLAN/WiMAX

A new optically controlled reconfigurable antenna for cognitive radio is presented. The can operate at an ultra-wideband and three narrow bands by controlling four photoconductive switches. bandwidth of the 2.65 to 10.3 GHz. bandwidths are 7.10 8.01 GHZ, 3.55 5.18 GHz, 5.12 6.59 respectively.

A novel broadband horizontally polarized (HP) omnidirectional planar antenna is developed for mobile communications.The proposed consists of four printed arc dipoles that form a circular loop HP radiation.A feeding network which includes baluns and an impedance matching circuit designed to excite the dipoles.An eight-element linear array 2G/3G base stations.A power divider used feed array.Experimental results show element has bandwidth 31% (1.66-2.27GHz) while its 34% (1.67-2.35GHz) gain ∼ 8...

A novel broadband differentially fed dual-polarized planar antenna is proposed in this communication. The composed of two dual-dipole elements, each which by coaxial cables through a short stub. Four pairs parasitic elements are introduced to enhance the bandwidth. Both and etched on same substrate, making feature configuration. achieves 15-dB differential impedance bandwidth 45% (|S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">dd11</sub> |...

A compact tri-band horizontally polarized (HP) omnidirectional antenna is proposed. The HP consists of a folded patch inside metal box with vertical slot. operates in the first-order resonant mode for lower band, while it works second-order upper featuring size 0.32λ0 × 0.16λ0 0.08λ0. For middle slot excited by patch. Two slits on are introduced to enhance bandwidths antenna. It shown experiment that covers three frequency bands 840.5-845, 1430-1444, and 2408-2440 MHz specified Ministry...

ABSTRACT An all‐metal slotted waveguide antenna is proposed for 79 GHz millimeter‐wave automotive radar applications. The consists of a jagged rectangular cavity with four slots which forms linear array. A TE mode excited in the by feed at bottom center cavity. Four radiating are introduced above to enhance radiation cavity, thus improving impedance matching and increasing gain. Simulation measurement results show that achieves peak gain 14 dBi fan‐beam pattern an bandwidth 7%, covering band...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> A compact broadband planar antenna is developed for global positioning system (GPS), DCS-1800, IMT-2000, and WLAN handsets. The consists of an S-strip a T-strip which are separately printed on the two sides thin substrate (no via process involved in fabrication). size only 18 mm$\,\times\,$7.2 mm $\,\times\,$0.254 more than previously published configurations. bandwidth enhanced by mutual...

A new low-profile broadband dual-frequency planar antenna is developed for wireless handsets. The consists of a two-strip monopole the 2-GHz band and 5-GHz band. features low profile due to introduction an S-strip T-strip which are separately printed on two sides thin substrate (no via process involved in fabrication), forming monopole. bandwidth enhanced by taking advantage configuration mutual coupling between achieves ~35% at (1.6-2.3 GHz) ~15% (5.0-5.9 with height 7-8 mm, may find...

A cavity-backed loop antenna is developed for producing broadband circularly polarized (CP) radiation. The configuration consists of a slot and strip loop. radiates CP wave at lower frequency while the produces radiation higher frequency. combination two frequencies leads to bandwidth enhancement. slot/strip fed by single straight microstrip line. It demonstrated that can achieve an axial ratio (les 3 dB) 19% with good impedance matching. described operating principles circular polarization...

Mesenchymal stem cells (MSCs) have exhibited therapeutic effects in multiple animal models so that are promising liver substitute for transplantation treatment of end-stage diseases. However, it has been shown over-manipulation these increased their tumorigenic potential, and reducing the vitro culture time could minimize risk. In this study, we used a D-galactosamine plus lipopolysaccharide (Gal/LPS)-induced acute failure mouse model, which caused death about 50% mice with necrosis more...