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DESHIMA (Deep Spectroscopic High-redshift Mapper) is an instrument aiming at efficiently making spectroscopic redshift measurements of sub-mm wave galaxies (SMGs), thereby providing about the formation and the evolution of stars and galaxies. The aim of this work is to provide a preliminary study into the design of a wideband leaky lens antenna coupled quasi-optical system within a 1:3 bandwidth....
This contribution presents the design and sub-mm wave measurements of a wideband dual polarized leaky lens antenna coupled to kinetic inductance detector (KIDs) to be specifically used for tightly spaced focal plane arrays. The antenna is planar and composed by two crossed slots, fed by two orthogonal coplanar waveguide (CPW) lines. In transmission, the crossed CPW lines are fed differentially in...
This paper summarizes the recent advances in using frequency-diverse metasurfaces for computational imaging in the microwave and millimeter wave regimes. Frequency-diverse apertures are defined as structures that can generate distinct radiation patterns as a function of frequency. Such waveforms can multiplex a scene information into a set of backscattered measurements, which can be decoded using...
Microwave kinetic inductance detectors (MKIDs) promise high sensitivity, combined with device simplicity and intrinsic multiplexibility. We demonstrate in this paper the realization of an imaging system consisting of an array of 961 antenna-coupled MKIDs that is read out using a single pair of coax cables and an analogue-digital back-end with a 2 GHz readout bandwidth. We measure the optical NEP of...
This contribution presents the design of a dual polarized leaky lens antenna coupled to a Kinetic Inductance Detector (KID) in order to enable a broadband THz detector for future space applications. The designed antenna presents high aperture efficiency and clean symmetric patterns.
Indirect microwave holographic techniques offer a simple, low cost technique for a range of microwave measurements including the determination of antenna characteristics and the ability to provide good quality images of passive objects. This work provides a brief outline of the basic theory of indirect microwave holography and how it can be used for the reconstruction of scattered complex fields at...
The design of focal planes of power detectors for the characterization of radiometric distributed sources in the sub-mm wave regime is a problem of renewed interest for the scientific community. The important question is how to optimize the focal plane sampling and the focal plane feed elements for maximizing the acquisition speed. The key speed limitations for some popular feed solutions have been...
The design of focal planes of direct detectors for the characterization of radiometric distributed sources in the sub-mm wave regime is a problem of renewed interest for the scientific community. The important question is how to optimize the focal plane sampling or the focal plane feed elements for maximizing the acquisition speed. The key speed limitations for some popular feed solutions have been...
We propose an array of connected leaky-wave slots as feed of an extended hemispherical dielectric lens, for broadband imaging applications. Simulations of the entire structure, including array and lens, are performed by combining a spectral Green's function approach and an accelerated physical optics method. The antenna characteristics are investigated over a 4∶1 bandwidth parametrically varying the...
The use of indirect holographic techniques for antenna testing has been shown to offer a simple, low cost scalar technique for the reconstruction of complex antenna aperture fields. This work extends the use of indirect holography to the imaging of objects. This work provides a brief outline of the basic theory of indirect microwave holography and how it can be used for the reconstruction of scattered...
This paper introduces a compact solar parabolic reflector antenna design, with an effective DC solar performance and high gain / pencil beam antenna radiation characteristics, as an alternative to the standalone use of home-based autonomous solar panels and digital satellite antennas. The proposed solar reflector antenna consists of 2 parabolic shaped silicon solar panels with a diameter of 60 cm,...
This paper describes the modelling and analysis of a new smart antenna concept. The paper outlines the rational for the development of a dynamically reconfigurable smart antenna system without greatly increasing the complexity of the system. The subject smart antenna system is developed to offer good coverage and capacity using multiple beams throughout a cell sector and to be able to reconfigure...
In this paper, radiation characteristics of H-plane sectoral horn antenna are treated systematically by investigation of the feeding position, ridged flare, wall thickness and corrugating effects. The analytical regularization method (ARM) is used to solve the problem of E-polarized wave diffraction in a fast and accurate way. The numerical procedure is initially verified by the analytical solutions,...
In this paper, radiation characteristics of H-plane horn antenna are investigated for different structural parameters such as, waveguide width, horn length, flare angle, wall thickness, and source position. The ARM procedure is used for the 2D analysis of the antenna as a fast, accurate and stable numerical technique. The algorithm is firstly verified with analytical data for testing calculation errors...
In this paper, symmetric and cosecant-squared radiation patterns are obtained by using parabolic reflector antennas which have different geometrical structres. The analytical regularization method (ARM) is used to solve the problem of E-polarized wave diffraction by parabolic shaped perfectly electrical conductive (PEC) cylindrical reflector with finite thickness. The initial boundry value problem...
This work is based on the analysis and optimization of the radar cross section that is indispensable for today's defense industry. In this study, radar cross section analysis of many objects from simple geometric structures to military vehicles are made. Nowadays, when the electronic war technology is growing rapidly in, the stealth technology in radar systems became one of the indispensable factors...
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