Cost effective, new antenna technology is required to build the large collecting area being planned for the next generation of radio telescopes. The Large Adaptive Reflector (LAR) is a novel concept being developed in Canada to meet this challenge. A prototype with a 200-350m diameter reflector, operating up to 2 GHz with a bandwidth of 750 MHz is planned. With a collecting area up to ∼ 10% of ...

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...

A microstrip reflectarray is a flat reflector antenna that can be mounted conformally onto a spacecraft’s outside structure without consuming a significant amount of spacecraft volume and mass. For large apertures (2 m or larger), the antenna’s reflecting surface, being flat, can be more easily and reliably deployed than a curved parabolic reflector. This article presents the study results on a...

A millimeter wave antenna measurement system is presented. The frequencies of operation are around 100 GHz and 300 GHz (W/J Bands). The facility is a single reflector compact range system. Design tasks deal with the serrated reflector and the corresponding millimeter wave instrumentation design.

We consider here antemas that could be usefid as part of a fize radar for penetrating munitions. The concept requires radiating an ultra-short pulse using an antenna with maximum gain and a compact design. Both lens and reflector Impulse Radiating Antennas (IRAs) are recommended as suitable candidates for this purpose. We summarize the properties of these antennas, and we describe two measureme...

A W-band dual-polarized Cassegrain antenna for cloud radar is proposed. The aperture diameter of the main reflector of the antenna is 50 cm. By using a modified Magic-T structure in the feed horn, the antenna is dual-polarized with high port isolation. The measured results show that the port isolation is 44.7 dB. The gains are 47.3 dB and 49.5 dB for the two ports at 94GHz, respectively, and th...

This paper concerns amplitude-preserving kinematically equivalent offset continuation (OC) operators. I introduce a revised partial differential OC equation as a tool to build OC operators that preserve offset-dependent reflectivity in prestack processing. The method of characteristics is applied to reveal the geometric laws of the OC process. With the help of geometric (kinematic) construction...