Reflective array antenna

About: Reflective array antenna is a research topic. Over the lifetime, 4366 publications have been published within this topic receiving 57884 citations.

Compensation of mutual coupling in array antenna systems

Abstract: The method operates in transmit mode an array antenna system including a plurality of antenna elements (1-N) so that the signal radiated from the antenna has a desired antenna radiation pattern, by : calculating, for each array element, the required pre-perturbed incident excitation (ai) to compensate for the effects of mutual coupling with the other elements of the array, whereas, the required pre-perturbed incident excitation (ai) for an array element generates, after mutual coupling, a resultant desired voltage (vi) on the array element which, in combination with the other compensated elements of the array, produces the desired antenna radiation pattern, and applying to each element of the array, the calculated pre-perturbed incident excitation (ai) for said element.

Components of a highly integrated DBF terminal antenna for mobile Ka-band satellite communications

Abstract: In this paper several components for a highly integrated digital beamforming (DBF) antenna array for Ka-band satellite systems are presented. The general concept of array construction based on a modular approach is introduced and the construction of a constituent array module discussed. Following this outline, different components, designed and tested to later be incorporated into the array module, are treated with the focus set on the Ka-band receiver and transmitter frontends.

Ultrawideband phased array antenna technology for sensing and communications systems

Abstract: Practical ultrawideband phased array technology used in airborne and ground-based systems applications. Ultrawideband phased array antennas are an enabling technology for many ground-based and airborne communications and radar systems. This book surveys electromagnetic theory and phased array antenna theory and provides examples of ultrawideband phased array antenna technology. It describes some of the research on ultrawideband phased arrays undertaken by the authors and their colleagues at MIT Lincoln Laboratory over the last ten years. The book focuses on experimental prototype ultrawideband phased array technology developed at Lincoln Laboratory for applications in the VHF and UHF bands from approximately 100 MHz to 1 GHz, and addresses dipole, monopole, loop, and other antenna array elements. It offers examples of antennas for both airborne and ground vehicle applications. Most of the examples are developed in the context of rapid prototyping for quick assessment of communications and radar systems feasibility, with measurements and numerical electromagnetic simulation results provided for many prototype examples. The book is intended primarily for practicing antenna engineers, radar engineers, and communications engineers, and for graduate students and researchers in electrical engineering. Readers need no prior knowledge of ultrawideband antennas, although some background in electromagnetic theory, antennas, radar, and communications would be helpful.

Loop antennas for directive transmission into a material half space

Abstract: The horizontal circular loop and the coaxial array of loops above a material half space are studied as antennas for directive transmission into the half space In a practical situation the loops might be located in air with the directive transmission into the earth In determining the optimum geometry for the single loop and the array, the far-zone field patterns and directivities of these antennas when placed over lossless dielectrics are considered first The directive properties for the lossless dielectric are found to be indicative of those for the same antenna over a medium with low loss when proper account is taken of the exponential attenuation experienced in the lossy medium Parametric studies are used to obtain the maximum directivities for these antennas For the single loop of resonant size, the optimum height over the interface is determined, and for the two-element array consisting of a driven loop of resonant size with a single parasite, the optimum size and spacing of the parasitic reflector are found Measured electric field patterns and gains of model antennas above an interface between air and fresh water are in good agreement with the theoretical results

Two-way airborne broadband communications using phased array antennas

Abstract: The Connexion by BoeingSM service provides broadband two-way connectivity to airborne platforms via geostationary Ku-band satellite links. The airborne terminal currently deployed consists of a receive and transmit phased array antenna system, a spread spectrum modem, and associated airplane local area network hardware. This paper describes the phased array antenna subsystem being used for current Connexion by BoeingSM installations; the Connexion Block One antenna subsystem.