A low-profile single-feed circularly polarized (CP) patch antenna using metasurface is proposed for broadband operation. The comprised of a truncated corner square sandwiched between lattice 4 × periodic metal plates and the ground plane. Surface waves propagating on are excited in structure. This phenomenon generates additional resonances minimum axial ratio (AR) points radiating structure, consequently broadening impedance-matching AR bandwidths antenna. final prototype, with an overall...

In this letter, we propose a broadband printed-dipole antenna and its arrays for fifth-generation (5G) wireless cellular networks. To realize wide frequency range of operation, the proposed is fed by an integrated balun, which consists folded microstrip line rectangular slot. For compactness, printed dipole angled at 45°. The single-element yields |S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> | <;-10-dB bandwidth 36.2% (26.5-38.2...

A crossed dipole that is loaded with a magneto-electric to produce the wideband and wide-beam circularly polarized radiation characteristics proposed. The incorporated double-printed vacant-quarter rings feed antenna. antenna backed by metallic cavity provide unidirectional pattern wide axial-ratio (AR) beamwidth high front-to-back ratio. Experimental results showed prototype an overall size of 120×120×30.5 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

This communication presents a multi-band, circularly polarized (CP), wide beamwidth, highly efficient antenna for use in global positioning systems (GPS). The primary radiating elements are two crossed printed dipoles, which incorporate 90° phase delay line realized with vacant-quarter ring to produce the CP radiation and broadband impedance matching. To achieve multiple resonances, each dipole arm is divided into four branches different lengths, inductor barbed end inserted branch reduce...

This letter proposes a compact wideband circularly polarized (CP) antenna array, which is set of 2 × metasurfacebased CP patch antennas fed by sequential-phase (SP) network. The single element composed truncated corner square sandwiched between the ground plane and metasurface lattice 4 periodic metal plates. These metasurface-based are incorporated with SP network sequentially rotated series-parallel feed to achieve operation. radiation pattern operational bandwidth in high-frequency region...

A dual-band, low-profile, circularly polarized antenna on an artificial magnetic conductor (AMC) is introduced in this letter. The employs a single feed and two crossed asymmetric dipoles as the primary radiating elements. In order to achieve low profile broadband characteristics terms of impedance matching 3-dB axial-ratio (AR) bandwidths at both bands, dual-band AMC utilized reflector antenna. structure utilizes four T-shaped slits unit-cell patch significantly reduce its first second...

A triband circularly polarized (CP) crossed-dipole antenna is introduced for 2.4/5.2/5.8-GHz wireless local area network (WLAN) applications. It employs a single feed and only two crossed trident-shaped dipoles as the primary radiating elements. To achieve compact radiator size, techniques are utilized, namely, insertion of meander-line segment in middle branch tridents termination all trident arms with arrowhead-shaped tips. The backed by high impedance surface (HIS) to broadband...

A dual-band, wide-beam, circularly-polarised crossed asymmetric dipole antenna is presented for global positioning system (GPS) applications. Each arm has an asymmetrically barbed arrowhead and contains two different-sized printed-inductors to reduce the length of primary radiating element achieve dual-band operation. At 1.575 GHz, a gain 7.5 dBic, radiation efficiency 97.4%, 3dB axial ratio (AR) beamwidth 143° 152° in x-z y-z planes, respectively. 1.227 6.3 90%, AR 132° 140°

A compact circularly polarized (CP) crossed-dipole antenna for radio frequency identification in the ultra-high is proposed. The consists of two orthogonal dipoles with an arm composed a meander line and triangular-shaped ending achieving size. modified T-match used impedance matching between tag chip. In this design, CP excitation achieved by incorporating semi-circular curves inserted orthogonally arranged dipole arms. final dimensions 35.6 ×35.6 ×0.508 mm <sup...

This paper presents a planar circularly polarized (CP) antenna array with high-gain and wideband operation. The is based on sequentially rotated feeding network for set of 2 × CP metasurface-based antennas. single element microstrip-line-fed slot antenna, which coupled to metasurface having 4 truncated corner square patches, produce the radiation. characteristic design obtained by proper combination between proposed array, an overall size 50 2.032 mm3 (~1.60 1.60 0.065 λ0 at 9.6 GHz), has...

In this letter, a broadband dual-polarized metasurface-based antenna is proposed for in-band full-duplex applications. The design concept exploits the wideband and low-profile features of metasurface, as well its structural symmetry to implement differential-fed scheme high isolation. An operating at 3.5 GHz optimized, fabricated, tested. prototype with dimensions 0.97λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">min</sub> × 0.078λ (λ...

In this paper, we present a circularly polarized (CP) composite cavity-backed crossed dipole antenna for global positioning system (GPS) applications. We produce the CP radiation by crossing two dipoles through <TEX>$90^{\circ}$</TEX> phase delay line of vacant-quarter printed ring, which also has broadband impedance matching characteristic. Two techniques, insertion meander lines in arm and arrowhead-shaped trace at its end, are employed to reduce sizes primary element. The compact radiator...

A wideband circularly polarized (CP) antenna with a single feed is proposed for use in global navigation satellite systems. Its primary radiation elements are composed of two orthogonal bowtie dipoles, which equipped double-printed vacant-quarter rings to allow direct matching the <TEX>$50-{\Omega}$</TEX> coaxial line and produce CP radiation. The crossed dipole appropriately incorporated planar metallic reflector desired unidirectional pattern as well achieve characteristic terms impedance...

A circularly polarized (CP) patch antenna loaded with a metasurface, which is realized lattice of 4 × square solar cells, presented. The composed slotted circular sandwiched between the metasurface and ground plane. This arrangement not only allows for total exposure cells to sunlight (100% insolation) but also improves performance greatly. final design, an overall size 40 mm 3.5 (0.87λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">o</sub>...

A dual-polarized omnidirectional antenna with simple feed and ultrawide operational bandwidth is presented. The a combination of four vertical monopoles horizontal dipoles. are printed on two thin FR4 substrates arranged orthogonally to each other. This arrangement not only makes the design easy fabricate, but also significantly simplifies To avoid feeding intersection, feedline dipoles placed at an off-center position. allows placing three additional metallic posts, which system...

This paper presents a dual-circularly polarized (dual-CP) antenna with simple configuration, low-profile, and wide bandwidth. Its primary radiating element is an aperture-coupled patch loaded stacked for operational A single-section hybrid coupler utilized as feeding structure of the to generate dual-CP radiation. Different from priors normally requiring both wideband radiator structure, this work demonstrates that radiation can be obtained by combining conventional coupler. design operating...

This letter presents a dual-band dual-polarized slotted-patch antenna with high isolation and gain for in-band full-duplex applications. The consists of double differential-feed <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$45^\circ$</tex-math></inline-formula> -rotated square patch four capacitively coupled notation="LaTeX">$\Gamma$</tex-math></inline-formula> -probes. proposed design utilizes the TM10...

Abstract This letter presents a wideband quasi‐Yagi antenna fed by microstrip‐to‐slotline transition. The transition consists of microstrip radial stub and slot stub, both at 90° but with different radii, to achieve impedance matching. has measured fractional bandwidth approximately 46% (4.64–7.42 GHz) for −10 dB reflection coefficient flat gain 6.0–6.75 dBi front‐to‐back ratio cross‐polarization level better than 17 −15 dB, respectively, across the bandwidth. © 2011 Wiley Periodicals, Inc....

This paper proposes a new way of designing dual-band circularly polarized (CP) antenna by using single-band CP radiator on finite artificial magnetic conductor (AMC) surface. The AMC surface consists lattice square metal plates grounded dielectric substrate while the is compact crossed dipole, which employs 90° phase-delay line consisting vacant-quarter printed ring to generate broadband radiation. operation obtained utilizing original band generated and first additional caused waves...

A single-feed circularly polarised (CP) patch antenna loaded with a single dielectric superstrate for wideband high-gain CP radiation is presented. Along the gain enhancement, emphasis on extra of caused by superstrate, which broadens axial-ratio (AR) bandwidth significantly. prototype was fabricated and measured at frequency 11 GHz. The overall size 40 × 17.45 mm has voltage standing wave ratio <2 24.35% (10.1–12.9 GHz), 3 dB AR 13.6% (10.3–11.8 peak 13.17 dBic, >26% (10.0–13.0 efficiency...

This letter presents a compact wideband sequential-phase (SP) feed for use in sequentially rotated antenna arrays. The SP network is designed to match 50-Ω coaxial line. phase difference (out-of-phase) between the outer and inner conductors of line utilized as 180° shifter; consequently, desired phases at outputs operation are achieved. For size, on two-layer substrates employs two vacant-quarter printed rings that act 90° delay lines. design yielded reflection coefficient (|S <sub...

In multiscattering environment, the channel capacity can be enhanced by employing dual-polarized antennas, and more significantly, using tripolarized antennas. Aiming at providing a wide coverage of both existing wireless communication systems new 5G sub-6 GHz band, this article presents compact ultrawideband antenna. The proposed design consists monopole-equivalent structure for vertically linearly polarized (LP) omnidirectional radiation two orthogonal stepped dipoles ±45° LP broadside...

This communication investigates design requirements for a class of dual-polarized in-band full-duplex (IBFD) antennas utilizing symmetry structures and differential-feeding scheme. The analysis reveals that, to achieve zero coupling between two ports, the out-of-phase power divider (PD) does not need have perfect isolation matching at output ports. A more relaxed set PD is derived first time. Based on this, an ultra-wideband cross-shaped Vivaldi antenna designed IBFD applications with very...