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 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....

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...

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 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...

A wideband omnidirectional circularly polarized (CP) antenna is developed. The CP includes four tilted dipoles that are wrapped around a cylinder for pattern. Each dipole coupled with parasitic element bandwidth enhancement. It shown the achieves an axial ratio (AR) of 44% (1.69-2.64 GHz) AR <; 3 dB and impedance 61% (1.35-2.54 return loss >10 dB. gain 1 dBi omnidirectionality less than 1.5

A triple-band multibeam multiple-input multiple-output (MIMO) antenna is investigated for access points (APs). The covers 2.4-2.5, 3.4-3.7, and 5.1-5.9 GHz frequency bands with high gains directional radiation patterns WLAN/WiMAX applications. MIMO consists of four elements rotated around a circle space polarization diversities. composed units the coverage conical area. designed performance evaluated. It shown that low capacity loss diversity gain can be obtained correlation branch power...

Two bandwidth-enhanced broadband dual-polarized antennas (BEBDPAs) are proposed for 2G/3G/4G wireless communication systems and international mobile telecommunication services. The first BEBDPA is composed of two perpendicularly crossed dipoles. Its bandwidth enhanced by introducing a parasitic loop below the dipoles disk with four strips above. achieves an impedance 64% reflection coefficients <;-15 dB (1.4-2.75 GHz) isolation 30 dB. second based on pair dual-dipole elements above...

For purpose of utilizing orbital angular momentum (OAM) mode diversity, multiple OAM beams should be generated preferably by a single antenna. In this paper, an reconfigurable antenna is proposed. Different from the existed antennas with ports for modes transmitting, proposed only port, but it can used to transmit 1 or -1 arbitrary controlling PIN diodes on feeding network through programmable microcontroller which control remote controller. Simulation and measurement results such as return...

A tri-band differentially fed dual-polarized slot (DFDPS) antenna is developed for indoor WiFi/5G wireless communications. The triband made up of two crossed slots with four pairs L-shaped slots. lower and higher bands are generated by the slots, middle band attributed to Eight shorting pins introduced improving impedance matching all three bands. substrate-integrated waveguide (SIW) cavity employed back unidirectional radiation. Two orthogonal feedlines applied feed dual polarization. has a...

A new approach is proposed to develop aperture-shared dual-band antennas using partially reflecting surfaces (PRSs). fully antenna consisting of a low-band (LBA) and high-band (HBA) right below the LBA first investigated. The aperture sharing has little influence on but causes severe shielding effect HBA. To alleviate effect, low-pass PRS inserted between HBA, forming an air-filled quasi-Fabry&#x2013;Perot cavity, which can make compensation for radiation from HBA with LBA. second introduced...

In this article, we propose a compact ±45° dual-polarized dual-dipole (DPDD) antenna for second-, third-, and fourth-generation (2G/3G/4G) long-term evolution (LTE) base stations. The DPDD consists of two perpendicularly crossed elements. Each element is directly fed by coaxial cable. Two elements are printed on the same substrate, making planar compact. Due to coupling between elements, can achieve broad bandwidth 51% return loss greater than 15 dB (1.61-2.71 GHz) with high isolation 30 dB....

A multiband planar antenna is proposed for mobile handsets. The covers four frequency bands: 696–970 MHz Long Term Evolution (LTE) 700, Global System Mobile Communications (GSM) 850/900; 1683–2700 GSM 1800/1900, Universal Telecommunications (UMTS) 2100, LTE 2300/2600, WLAN 2.4 GHz, WiMAX 2.5 GHz; 3070–3755 3.5 and 4590–7604 WLAN/WiMAX 5.2/5.8 GHz 5.5 GHz. consists of a U‐shaped monopole coupling with an S‐shaped strip, clip‐shaped meander line inverted‐C X‐shaped monopole, F‐shaped monopole....

A low-profile broadband quad-polarization reconfigurable omnidirectional antenna is presented. The consists of a circular loop for horizontal polarization (HP) and toploaded monopole vertical (VP). composed four arc dipoles excited by feeding network. left-handed (LHCP) obtained simultaneously the top-loaded with different phases. Two λ g/2 phase shifters are introduced right-handed (RHCP). 12 p-i-n diodes employed in network to realize reconfiguration. It shown that bandwidth overlapped HP,...

A novel broadband circularly polarized (CP) antenna is proposed. The operating principle of this CP different from those conventional antennas. An off-center-fed dipole introduced to achieve the 90° phase difference required for circular polarization. new consists two dipoles. Combining such antennas leads a bandwidth enhancement T-shaped microstrip probe used excite antenna, featuring simple planar configuration. It shown that achieves an axial ratio (AR) 55% (1.69-3.0 GHz) AR <; 3 dB,...

A front-to-back pattern-reconfigurable antenna based on two dipoles is investigated. The theory for a pattern reconfiguration analyzed. ratio (F/B) improved by using folded dipoles. realized switching PIN diodes with broadband baluns. Two parasitic elements are introduced the improvement of impedance bandwidth and bandwidth. shorter dipole added to each further enhancing Experimental results show that achieves 31.4% return loss >10 dB pattern-bandwidth 20.8% F/B > 10 11.5% 15 dB.

An embeddable decoupling structure is proposed for massive multiple-input-multiple-output (M-MIMO) antennas in this paper. The made up of an end-folded metal strip and a pair C-shaped strips. By introducing the near two closely spaced dipole antennas, additional coupling can be generated to counterbalance original mutual between antennas. firstly designed 1×2 MIMO antenna, which provide reduction about 5 dB coupling. Then, evolutional designed, composed inverted U-shaped strips parallel...

A directional triple-band planar antenna is proposed for WLAN/WiMax access point applications. The consists of a top-loaded dipole the 2.4 GHz band, two longer dipoles 3.5 band and shorter 5 band. All are printed on same substrate. achieves radiation pattern at all three frequency bands with an gain 7.5 dBi lowest 8.5 middle 9–10 highest

A new broadband flush-mountable dual-polarized antenna with very high isolation is proposed. The made up of a pair crossed slots that are fed by two orthogonal microstrip feedlines. metallic cavity introduced to back the slot for unidirectional radiation pattern. By setting feedlines on substrate layers separated metal ground which etched, achieves 40 dB. has broad bandwidth (BW) about 47%, due wide and impedance matching It shown can be easily flush mounted surface without affecting BW...

A new broadband quad‐polarisation reconfigurable antenna is proposed. The consists of a +45° polarised dipole and −45° dipole. Each excited by balun. feeding network employed to feed the ±45° dipoles. When dipoles are separately fed, linear polarisations obtained. As simultaneously fed with +90° or −90° phase difference, left‐handed circular polarisation (CP) right‐handed CP asserted. It shown simulation experiment that achieves an overlapped impedance bandwidth 37% (0.69–1.0 GHz) for return...

An eight-element broadband wide-beam circularly polarized (CP) antenna array is developed for mobile wireless communications. The CP element consists of two rectangular loops with gaps circular polarization and parasitic elements bandwidth enhancement. A wide beamwidth achieved in the horizontal plane because have a narrow cross section plane. also has higher isolation between than linear (LP) same space, which due to mismatch caused by currents elements. achieves 40% (1.7-2.55 GHz) return...