Sun, 06 Jul 2008 11:02:29 BST CiteULike: dcastros Sor http://www.citeulike.org/user/dcastro/author/Sor CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2801445 <i>Electronics Letters, Vol. 36, No. 1. (2000), pp. 1-2.</i><br /><br />A novel coplanar waveguide fed quasi-Yagi antenna is presented. A wide bandwidth is achieved by using a broadband coplanar waveguide to a slotline balun. An X-band prototype has been realised which demonstrates a broad bandwidth (30%), -19 dB front-to-back ratio, and cross-polarisation better than -17 dB at 10 GHz. Coplanar waveguide fed quasi-Yagi antenna J Sor Yongxi Qian T Itoh doi:10.1049/el:20000132 Electronics Letters, Vol. 36, No. 1. (2000), pp. 1-2. 2008-05-15T12:09:44-00:00 2000 Electronics Letters 36 1 1 2 antenna coplanar http://www.citeulike.org/user/dcastro/article/2801361 <i>Microwave Conference, 1999 Asia Pacific, Vol. 1 (1999), pp. 142-145 vol.1.</i><br /><br />A novel printed antenna with broadband circular polarization (CP) characteristics is presented. The antenna design is based on a recently developed uniplanar quasi-Yagi. The antenna measures VSWR<2 and AR<3 dB in the frequency range from 3.40 to 6.34 GHz (60.4%). The bandwidth is more than twice that of the best planar CP antenna to our knowledge. The measured dual-linear pattern at 5 GHz shows that the antenna has excellent CP performance, with its AR below 6 dB over a wide range of scan angles (±80°) from the mainbeam direction A novel printed antenna with broadband circular polarization Yongxi Qian WR Deal J Sor T Itoh doi:10.1109/APMC.1999.828070 Microwave Conference, 1999 Asia Pacific, Vol. 1 (1999), pp. 142-145 vol.1. 2008-05-15T11:29:01-00:00 1999 Microwave Conference, 1999 Asia Pacific 1 142 145 vol.1 antenna broadband circular polarisation printed http://www.citeulike.org/user/dcastro/article/2801360 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 48, No. 6. (2000), pp. 910-918.</i><br /><br />In this paper, a novel broadband planar antenna based on the classic Yagi-Uda dipole antenna is presented, and its usefulness as an array antenna is explored. This “quasi-Yagi” antenna is realized on a high dielectric-constant substrate, and is completely compatible with microstrip circuitry and solid-state devices. This antenna achieves a measured 48% frequency bandwidth for voltage standing-wave ratio <2, better than a 12-dB front-to-back ratio, smaller than -15 dB cross polarization, and 3-5-dBi absolute gain. Mutual coupling of the antenna in an array environment is investigated. Finally, three simple arrays are presented, demonstrating the usefulness of the antenna as an array element. This novel antenna should find wide application in wireless communication systems, power combining, phased arrays, and active arrays, as well as millimeter-wave imaging arrays A new quasi-Yagi antenna for planar active antenna arrays WR Deal N Kaneda J Sor Y Qian T Itoh doi:10.1109/22.846717 Microwave Theory and Techniques, IEEE Transactions on, Vol. 48, No. 6. (2000), pp. 910-918. 2008-05-15T11:28:58-00:00 2000 Microwave Theory and Techniques, IEEE Transactions on 48 6 910 918 active antenna array planar http://www.citeulike.org/user/dcastro/article/2801356 <i>Radio and Wireless Conference, 1999. RAWCON 99. 1999 IEEE (1999), pp. 231-234.</i><br /><br />An active array with a quasi-Yagi antenna element is presented. The array has a bandwidth of 60% (VSWR <2) and a fan-beam pattern. The gain of the active array is measured to range from 22-25 dB from 8-11.7 GHz. The single layer compact design makes this array antenna ideal as a building block in larger 2-D arrays A broadband uniplanar quasi-Yagi active array for power combining WR Deal J Sor Y Qian T Itoh doi:10.1109/RAWCON.1999.810972 Radio and Wireless Conference, 1999. RAWCON 99. 1999 IEEE (1999), pp. 231-234. 2008-05-15T11:27:42-00:00 1999 Radio and Wireless Conference, 1999. RAWCON 99. 1999 IEEE 231 234 active array broadband combining power http://www.citeulike.org/user/dcastro/article/2776273 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 49, No. 12. (2001), pp. 2336-2341.</i><br /><br />Several novel periodic structures for coplanar waveguides are presented. The proposed structures exhibit low insertion loss in the passband, simple fabrication, and slow-wave characteristics. These structures are applied to realize miniature low-pass filters one-tenth the size of conventional filters, with spurious-free response and deep attenuation levels using only three cells Miniature low-loss CPW periodic structures for filter applications J Sor Y Qian T Itoh doi:10.1109/22.971618 Microwave Theory and Techniques, IEEE Transactions on, Vol. 49, No. 12. (2001), pp. 2336-2341. 2008-05-09T16:40:15-00:00 2001 Microwave Theory and Techniques, IEEE Transactions on 49 12 2336 2341 filer periodic structure