Reflector (antenna)

About: Reflector (antenna) is a research topic. Over the lifetime, 28730 publications have been published within this topic receiving 212618 citations.

Low-RCS Reflectarray With Phase Controllable Absorptive Frequency-Selective Reflector

Abstract: This paper presents a methodology to control the reflection phase response from a 3-D bandstop structure backed with an absorbing material. An absorptive frequency-selective reflection structure using the cascaded arc-shaped strip resonators and absorbers is utilized to obtain an absorption–reflection–absorption response. The reflection phase response of the structure within the reflection band is then flexibly controlled by top-loaded metallic patches with variable size. An application of this methodology is demonstrated by designing a high-gain and low-radar cross section (RCS) reflectarray. The in-band phase profile of the reflecting surface is constructively designed to collimate the beam in the far field. Meanwhile, the out-of-band scattering from the planar reflector is significantly reduced. Compared with a conventional reflectarray, the radiation performance of the proposed antenna is maintained with an aperture efficiency of 50.1% and directivity of 23.5 dBi. Significant RCS reduction has been achieved with a fractional bandwidth of 76.9% and 17.1% for the lower and upper bands with reduction levels of 10 and 8 dB, respectively.

Radiation image sensor and scintillator panel

Abstract: A radiation image sensor comprises an image sensor (1) including an one- or two-dimensional array of photodetector elements (12); needlelike scintillators (2) formed on the photodetector surface of the image sensor (1) and adapted to convert radiation into light of wavelength which can detect by the image sensor (1); a protective film (3) formed in close contact over the needlelike scintillators (2); and a radiation-transparent reflector (4) with an optical reflective surface (42) opposed to the image sensor across the protective film (3).

Surface-emitting semiconductor laser

Abstract: A surface emitting semiconductor laser includes: a substrate; a first semiconductor multilayer reflector of a first conduction type that is formed on the substrate and is composed of stacked pairs of relatively high refractive index layers and relatively low refractive index layers; a cavity region that is formed on the first semiconductor multilayer reflector and includes an active region; and a second semiconductor multilayer reflector of a second conduction type that is formed on the cavity region and is composed of stacked pairs of relatively high refractive index layers and relatively low refractive index layers. A cavity length of a cavity that includes the cavity region and the active region between the first semiconductor multilayer reflector and the second semiconductor multilayer reflector is greater than an oscillation wavelength.

Active antenna system (AAS) radio frequency (RF) module with heat sink integrated antenna reflector

Abstract: On-board heat dissipation can be achieved in radio frequency (RF) modules by integrating a heat sink into the RF module's antenna reflector. Said integration achieves a compact and aesthetically pleasing RF module design that reduces the overall footprint of modular active antenna systems (AASs). Embodiment antenna reflectors include portions that are perforated and/or exposed to free flowing air to provide enhanced heat dissipation capability.

Optical interconnect modules with fully integrated reflector mirrors

Abstract: A robust and cost-effective technology for integration of 45/spl deg/ reflector mirrors and polymer waveguides (WGs) into optical interconnect (OI) substrates is developed. The planar WGs are formed from photopatternable polymers with propagation losses as low as 0.05 dB/cm. The mirrors with losses of 0.5-0.8 dB are fabricated by the microdicing technique allowing lateral and vertical positioning of the mirror plane within several microns. A prototype OI module with integrated channel WGs, mirrors, and assembled connectors is fabricated and successfully tested at 10-Gb/s transmission rate.