We present the classical electromagnetic theory framework of reflection a light beam carrying orbital angular momentum (OAM) by magnetic structure with generic symmetry. Depending on magnetization symmetry, we find change in OAM content reflected due to magneto-optic interaction and an asymmetric far-field intensity profile. This leads three types helicoidal dichroism (MHD), observed when switc...

The paper proposes the automatic opening and closing blinds’ structure. There is a bearing support seat located at the bottom of the inner beam to let the link rod set the position. Also, there are a front thread and a reversed thread, and a screw driven device on both sides of the link rod. Moreover, at the lateral end of the front and reversed threads, they are equipped with the holder of the...

In this article, the performance of W-band (90 GHz) over a Deep Space Network’s 34-m beam-waveguide (BWG) antenna is analyzed in terms of its average data return. In order to do so, data were collected from various sources about the performance of various W-band components. In addition, equations for calculating the W-band atmospheric noise temperature from water vapor radiometer 31.4-GHz sky-b...

The active vibration suppression of a single flexible link manipulator using a piezoelectric actuator is investigated. For this purpose, a finite element (FE) model is developed for the modal and transient analysis of a cantilever beam and a flexible link manipulator. A proportional control strategy is employed in a FE model to adjust the voltage applied to the piezoelectric actuator so as to c...

This research work provides a method for forming a communications link of Wireless Sensor Networks (WSN) by enabling each WSN to act as a smart antenna. Each WSN is simulated as a set of randomly placed sensor nodes within a planar area. The proposed method involves a searching WSN, a receiving WSN and a link budget for establishing the link. The searching WSN has the task of transmitting a sea...

ABSTRACT: Several reinforced concrete deep beams with different L/D ratios (1.5, 1.6, 1.71) were cast and tested in order to investigate the strain distribution pattern at mid-section of the beam. This paper describes analysis of deep beams subjected to two point loading with three different L/D ratios (1.5, 1.6, 1.71) using Non-linear Finite element method (ANSYS 9.0 software). In ANSYS 9.0 so...

A resurgence is occurring in the area of underwater laser communications. While acoustic systems are currently the more mature technology, they are ultimately band-limited to sub-MHz type data rates due to the frequency dependent absorption of acoustic energies in water. Advances in fiber optic and free space links have shown promise for optical links to provide data rates in excess of a gigabi...

AbstructThe space shuttle orbiter (SSO) Ku-band single access return (KSAR) link and the space station freedom (SSF) KSAR link' via the tracking and data relay satellite system (TDRSS) use the same carrier frequency. The interference between spacecraft is minimized by opposite antenna polarizations and by TDRSS antenna beam pointing, but if the SSF and SSO are in close proximity, it is expected...

The strawman PASS design calls for the use of a CONUS beam for transmission between the supplier and the satellite and for fixed beams for transmission between the basic personal terminal (BPT) and the satellite. The satellite uses a 3m main reflector for transmission at 20 GHz and a 2m main reflector for reception at 30 GHz. The beamwidth of the reflector is 0.35°. To cover CONUS 142 fixed bea...

The millimeter-wave (mmW) communications is a key enabling technology in 5G to provide ultra-high throughput. Current mmW technologies rely on analog phased arrays realize beamforming gain and overcome high path loss. However, due limited number of simultaneous beams that can be created with analog/hybrid antenna arrays, the overheads beam training scheduling become bottleneck for emerging netw...