This communication proposes a low-profile dual-band circularly polarized (CP) antenna for satellite at K- and Ka-bands. The consists of folded transmitarray (TA) operating 20 GHz multi-feed reflectarray (RA) 30 GHz. dual split rings are used as the TA RA elements. is placed above RA. acts phase-controlling surface does not affect transmission plane waves generated by simultaneously serves ground Owing to combination with small focal length-to-diameter ratio, profile reduced,...

A reflect-transmit-array antenna (RTA) with dual-operating modes is proposed in this letter. The RTA, which has a three-layer structure without air layers, can achieve reflectarray-mode (RAM) at 11-14 GHz and transmitarray-mode (TAM) 15-19 GHz. When the incident electromagnetic (EM) wave y-polarization, RTA operates RAM, reflected EM y-polarization. In comparison, TAM transmitted circular polarization (CP) when x-polarization. dual-mode wideband been fabricated measured to validate design....

A multifunctional tri-band antenna combining transmitarray (TA) and reflectarray (RA) is presented in this communication. Five-layer patches etched on three dielectric substrates with two air gaps are used as the unit cell. Cross dipoles inserted cross slots control transmission characteristics at Ku-band (14 GHz). Double square rings top bottom layers reflection K (21 GHz)- Ka (30 GHz)-bands, respectively. The has dual-polarized each band. phase shift range that can be obtained 360° for 3...

A method for designing linearly-polarized-feed dual-circularly polarized dual-beam transmitarray (TA) is presented in this letter. According to a theory, linearly (LP) wave can be decomposed into left-handed and right-handed circularly (LHCP RHCP) waves. The LHCP RHCP phase compensated independently simultaneously by adjusting the initial rotation phases of element so that beams TA appear space controlled independently. designed receiver-transmitter used achieve above functions, fabricated...

This paper presents a double-layer, dual-band, orthogonally polarized, highly efficient transmitarray antenna (TA) operated in the Ku/K band (14 GHz/20 GHz) for millimeter wave (MMW) wireless communication systems (WCS). The proposed TA consists of two types multi-resonant dipoles with metal vias, operating Ku and K bands. elements are interlaced each other independently to ensure dual-band polarized operation. double-layer obtained 360° phase shift range transmission amplitude greater than...

This letter presents a double-layer 45 • linearly polarized (LP) wideband and highly efficient transmitarray antenna (TA).The proposed element is composed of two multi-resonant dipoles four metal vias.The are placed on the diagonal unit cell printed both sides dielectric substrate.The vias which penetrate substrate connect upper lower used to improve transmission efficiency obtain large phase shift range element.The realizes full 360 with smooth slope in band, magnitude loss less than 1.5 dB...

Multilayer dielectric barrier discharge (DBD) can efficiently enlarge the volume of homogeneous plasma and its interactional surface area with materials in vertical space, which seems attractive to industry application. In this paper, a new generator DBD structure has multilayers boards excited by repetitive submicrosecond pulsed power (0 -100 kV, 130 Hz-1 kHz, pulsewidth 230 ns, rise time 120 ns) is introduced, been obtained atmospheric pressure air. Experiments on high-speed photography an...

This paper distinguishes ship target from chaff by their difference in depolarization characteristics using fully polarized dual-channel radar which transmits vertical and horizontal polarization wave alternately receives co-polarization cross-polarization components simultaneously with two channels. It recognize the taking advantage of characteristic parameters echoes, after enlarging between component echoes involving both chaff. furthermore, non-linear transformation is adopted to...

This article presents a dual-band dual-polarized transmitarray (TA) with independent control of polarization at each band. Five-layer cross dipoles and rectangular patches are utilized to the transmission characteristics Ku (13.5 GHz) K (22 bands, respectively. Cross loops used improve independence between two bands response. The phases can be controlled independently both because band element. vertical horizontal also A TA specific beam direction for is designed verify antenna fabricated...

In this paper, a new application scenario for the conformal reflectarray is proposed. A element composed of split ring and two arcs acting as phase shift lines adopted. The between 0° 360° achieved by adjusting length arc lines. distribution calculation method proposed to achieve 10-dB enhancement monostatic radar cross section (RCS) at 15° 30° tail missile. Projectiles (missile body) with without are fabricated measured. Measurement results showed that projectile achieves RCS in angular...

Lateral resolution, as one of the most important parameters a confocal system, has direct effect on measurement accuracy system. The lateral resolution system can be improved by introducing radial birefringent pupil filter into differential function this obtained using Jones algorithm and, angle between polarization direction polarizing film and optical axis element, size a, got analyzing first zero point G. Meanwhile, we analyzed influence such factors defocusing amount response It was...

With the help of digital media technology, presentation methods Chinese painting will be more and modernized.On basis maintaining traditional flat static methods, openness, freedom humanization it can greatly enrich appreciation effect painting.It is conducive to spread painting.Also, innovation painting.

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In this paper, we introduce middleware architecture to support hybrid thread level parallelism on heterogeneous multicore architectures, called Heterothread. Heterothread constructs a hierarchical model for user programming and parallel task execution dataflow. can provide unified interfaces which allow applications remain the same when physical hardware (CPU, GPU, DSP FPGA) is reconfigured or migrated. Consequently it meet real-time demands more efficiently than most state-of-the-art...