A new colocated dual-polarized printed slot antenna with high port isolation is presented. This has an H-shaped consisting of a wide main coplanar waveguide feedline and two side slots microstrip feedline. Electric field analysis indicates that the antinodes for 1 are located at terminals, whereas those 2 in middle themselves. In addition, additional conductor strip size across nonfed introduced to improve symmetry structure then enhance isolation. An prototype designed WLAN 2.4-GHz band...

Harmonic suppression antennas are widely used in the microwave power transmission and active antenna systems. In this letter, a square ring slot loaded with two side slots is constructed as radiating element. Meanwhile, bottom transverse orthogonal to microstrip feedline introduced harmonic unit. fact, part of that extends into also has an inhibitory effect on harmonics. way, compact constructed. For proposed antenna, fundamental frequency rejection can be adjusted independently, so...

A compact dual-port multiple-input multiple-output (MIMO) antenna is proposed for 2.4 GHz wireless local area network systems. The radiation element consists of a monopole and patch ring with two cuts, through which coplanar waveguide port slotline are constructed. current distributions the both ports excited simulated analysed, respectively. According to measurement results manufactured prototype, isolation between these over operating frequencies better than –35 dB cross-polarisation...

A dual-band reflectarray antenna with a double layer, employing concentric square rings as reflecting elements, is proposed. With procedure of the steepest decent method (SDM), impressed phases elements are synthesized for proposed to radiate an optimum field pattern in near zone array aperture. The designed two frequency bands, covering 915 MHz and 2.4 GHz, which both can be used RFID applications.

A hybrid approach is presented to synthesize unequally spaced array antennas with low sidelobes. The exact locations of all the elements for can be quickly determined composite Taylor-Exponent configuration arrangement. Furthermore, an amplitude taper tremendously simple was designed reduce sidelobes antennas. Numerical results show that proposed effective modified synthesis antennas, reduced lower than -30 dB.

In this paper, we present a metasurface composed of complementary units that can realize orthogonal linear and linear-to-circular polarization conversion in multi-band. Linear has seven high-conversion frequency bands: 9.1–9.7 GHz, 15.6–17.6 19.4–19.7 21.2–23.1 23.5–23.8 26.2 27.9 GHz. Linear-to-circular also bands with axial ratios (ARs) less than 3 dB: 8.9–9.0 9.9–14.7 19.1–19.3 23.2–23.35 23.4 24.1–25.4 27.2–27.8 the generation multiple extended by combination units. Then, utilize...

A dual-polarized printed slot antenna is constructed by inserting the open-end into coplanar waveguide center conductor of T-shaped slot. In order to verify performance, an prototype was fabricated. The experimental results show that its working bandwidth about 10.5%. operating frequency band, isolation between two ports higher than 27 dB. proposed two-port has bidirectional radiation characteristics, but gain element element. maximum direction, copolarization level 39 dB cross polarization...

The analysis of electromagnetic (EM) scattering from a target located in the near zone an electrically large near-field-focused (NFF) array antennas is presented. first examined EM metal sphere, attempting to create reference for comparison with other targets fashion analogous conventional far-field radar cross section (RCS). Realistic were afterward and analyzed exhibit their RCS characteristics. A numerical simulation-based maximization fields effective detection antenna was developed,...

A unidirectional dual-polarised antenna is presented, by applying a cavity-backed annular slot and two mutually perpendicular microstrip feed lines. To improve the isolation between ports of designed antenna, pair conductor strips introduced at opposite side lines metal cylinder into cavity centre. Aimed 2.4 GHz wireless local area network systems, prototype has been fabricated based on FR4 substrate. The measured results show that an value over 33 dB can be attained co-polarised level 30...

For wideband RFID systems, we designed a dual- frequency ceramic spiral antenna with rectangle PBG structure array, working well respect to the main frequencies of 915 MHz and 2.4 GHz. The size is minimized obviously, only 30 mm X 1 mm. simulated results show that center in lower higher sections are 0.95 GHz 2.55 separately, at which return loss values S11 -23.22 dB -15.98 respectively. And for VSWR less than 2, absolute bandwidths apartly up 0.254 (0.837 - 1.091 GHz) 1.02 (2.157 3.177 GHz)....

Abstract A novel tri‐band antenna end‐loaded with Koch fractal loops and was designed for radio frequency identification (RFID) applications, based on FR4 substrate. Before after introducing a mirror array meander‐line structure, the proposed simulated investigated. The results show that great improvements have been reached, including return loss decreased to about 56 dB bandwidth increased 420 MHz at 2490 MHz, miniaturized size. With prototype fabrication, we also verified good performance...

Abstract This paper presents the design of reflectarray antennas to radiate an optimum near‐field distribution by using procedure steepest decent method synthesize impressed phases elements. In particular, closed‐form formulations used in electromagnetic modeling were developed for efficient design. The was further implemented realize a microstrip patch elements, which is illuminated radiation feed antenna at 2.4 GHz band radio frequency identification applications. Numerical investigations...

Abstract A 3/2 curve fractal dipole antenna was proposed for radio‐frequency identification application, with mirror and photonic bandgap structure. Some properties of the antenna, such as return loss bandwidth have been simulated investigated. The results show that absolute bandwidths are up to 0.28 GHz 0.41 at 2.4 5.8 GHz, respectively accordingly relative 9.76% 6.87%. With a prototype fabricated, we also verified good performance through comparison measured results. © 2010 Wiley...

For the minimization of RFID tag antenna, we designed a printed folded dipole antenna working at 2.4 GHz. And mirror compensation technology was introduced to improve radiation feature with better return loss characteristic and directivity. The simulated results show that when VSWR (Vertical Standing Wave Ratio) is less than 2, bandwidth up 0.39 GHz absolutely 15.48% relatively. Considering engineering processes, influences dielectric constant ◻r, board thickness, folding degree other...

For wideband RFID systems, a dual-frequency printed folded dipole antenna is designed with photonic bandgap (PBG) structure carved in the antenna's arms. Simulated results show that this has good return loss characteristic and hemisphere direction radiation characteristic, at two working centre frequencies of 0.90 2.24 GHz. Compared to other improved structures, new PBG special advantages simplifying structure. Considering engineering processes, influences arm width, dielectric loss,...

Aiming at the request of antenna used for 3G system, we first analyze characteristics microstrip and design methods size structure, then with PBG by using MWO. The detailed analysis inquiries into influence on reflection coefficient S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> key parameters, such as length sides, structural periodicity PBG, feeding point antenna, dielectric constant thickness circuit board have been studied....

A magnetic-controlled detection system, with a rectangular solenoid coil in waveguide test fixture, is proposed for radar absorbing coatings. By applying Ku-band waveguide, the field patterns at different positions, reflection coefficient S 11 and its variation of several coating samples are simulated measured under current loaded from 0 to 1.0 A. The results show that this system repeatable stable, also reliable error less than 10%.

τMicrowave dielectric properties of 0.95MgTiO 3 -0.05CaTiO ceramics and their performances as H-shaped microstrip patch antenna were investigated. Best values constant (ε r ) quality factor (Q×f) 19.00 66800GHz, respectively, obtained for the microwave sintered at 1300°C 3h. A near-zero temperature coefficient resonant frequency (τ f -4.7ppm/°C was with sintering 1280°C new kind two frequencies fabricated by using this substrate. The return loss bandwidth extended increasing substrate...

This paper develops a procedure of steepest decent method (SDM) to synthesize the impressed phases reflectarray array antennas, which will radiate an optimum field pattern in near-zone aperture. For purpose validation, microstrip patch elements is investigated with feed antenna operated at 2.4 GHz band and can be used for RFID applications.

The design of a band-notched antenna for UWB applications is based on 2nd- order T -shaped fractal configuration and distribution loading. proposed consists tree-shaped patch with two extra strips added each top the branches rectangular slot etched ground. With all optimized parameters by simulation, there are resonant frequencies from 2.75 to 6.14GHz block band 3.7 4.2GHz. polygon strip introduced between tree-arms, simulated measured results present that notch function covering 5.2/5.8G...

In this paper, the design of a petal-shaped left-handed (LH) metamaterial (MTM) is presented. The proposed structure consists an outer circular ring and four inner semicircular resonators, with former split into arms latter diameters close to ring. These resonators are cross loaded constitute whole four-fold symmetry. simulation results show that single-sided MTM has LH working frequency range 17.3 19.1 GHz. And then surface current, electric magnetic field distributions demonstrated...

A novel endless polarization control algorithm based on simulated annealing (SA) is proposed. The application of the SA in a fast feedback controller (PC) constructed by four electro-optic ceramic variable waveplates for continuous conversion state (SOP) presented. experiment results show that fluctuation light intensity desired output SOP less than 2% random input SOP. It demonstrated that, this SA-based PC can run reset-freely and response time 400μs.

Abstract The work presented in this article is focused on the design of an omni‐directional and dual‐frequency antenna for multiple input output (MIMO) applications. proposed consists a monopole with pair L‐shaped strips butterfly‐like coupling slot, excited by coplanar waveguide proximity coupling, respectively. Using two completely different elements exciting multimode orthogonal characteristics current, high isolation ports achieved. To improve stability impedance, gradient arc structure...