Interferometric telescopes made of close-packed antenna elements are an important tool for imaging extended radio sources, specifically structures that have angular sizes comparable to or even greater than the FWHM of the beams of the antennas. They have proved useful in observations of cosmic microwave background anisotropies that require high brightness-sensitivity. However, the visibilities ...

This paper presents the design of a tri-mode matched feed horn to remove the beam squinting effects in a circularly polarized offset parabolic reflector antenna. In a conical horn, three modes i.e., TE11, TM11 and TE21 are combined in proper amplitude and phase proportion to obtain a tri-mode matched feed configuration. The proposed tri-mode horn is then used as a primary feed device to illumin...

detection of stealth targets calls for employment of high-power radars which itself relies on usage of high-gain antennas like large parabolic reflectors. in the past few years, using of an array with many small reflectors instead of a large reflector antenna has been considered. this method provides enhanced eirp by a factor of n2 where n is the number of array antennas. regarding improvement ...

1 Introduction The previous researches on the modulated scattering antenna array (MSAA) have shown that the second-order intermodulation scattering signal is relatively low compared with the direct received signal [1]. In this report, a switched reflector is used to solve this problem. The diversity performance of the MSAA with a switched reflector is investigated. It is shown that the diversit...

We present cathodoluminescence experiments that quantify the response of plasmonic Yagi-Uda antennas fabricated on one-dimensional silicon nitride waveguides as function of electron beam excitation position and emission wavelength. At the near-infrared antenna design wavelength cathodoluminescence signal robustly is strongest when exciting the antenna at the reflector element. Yet at just sligh...

A reflector antenna utilizing three planar reflectors and a 3/4 X-unipole radiator is proposed. Calculations based on image and EMF-methods predict that the gain is about 5 dB greater than that of the two-dimensional comer reflector antenna, and that the input impedance is roughly between 50 and 75 9. Experiments conducted on the three-dimensional corner reflector antenna with rectangular comer...

I KE.LLERMEIER, H., VORBRUGG, H., and PONTOPPIDAN, K.: ’The MBB unfurlable mesh antenna (UMA) design and development’. AIAA 1 lth Communication Satellite Systems Conference, 1986, (3), pp. 8 M 6 4 2 CLARRICOATS, P. I. B., MI, z., BROWN, R. c., POULTON, G. I., and CRONE, G. E.: ‘A reconfigurable mesh reflector antenna’. IEE Conf. Publ. 1989,1, pp. 112-116 3 RAHMAT-SAMII, Y., and LEE, s.: ‘Vector...

専攻科電子工学専攻におけるPBL教育について 皆本佳計*、横山隆志*、 * 新居浜工業高等専門学校 電気情報工学科 新居浜工業高等専門学校紀要(特定論文) 第 51 巻 pp1-4 平成 27 年 1 月 PBLとは、Project Based Learning(プロジェクト・ベースト・ラーニング)の略称であり、日本語では 「プロジェクト型学習」や「問題解決型授業」などと訳されることが多い。PBLは、 課題の解決を目的と し、それをチームの力によって課題を解決することや受講者の自主性・自律性を重んじることなどで、従 来の教育手法では育成が難しかった問題解決能力を効率的に育成することが可能な教育手法して注目を集 めている。専攻科電子工学専攻では、技術者に必要な倫理観とシステムデザイン能力を身につけ、ものづ くりを通して社会貢献できる人材を育成することを目標としている。これを実現するため...