標題: Characteristics and design of broadside-coupled transmission line at a higher order leaky mode
作者: Huang, KFS
Tzuang, CKC
電信工程研究所
Institute of Communications Engineering
關鍵字: antenna arrays;high gain;multilayered;narrow beam
公開日期: 1-Feb-2003
摘要: The aim of this paper is to provide: 1) a detailed description of the higher order leaky modes of the much-used broadside-coupled microstrips and 2) demonstrate the practical application of such leaky modes as an antenna. A representative broadside-coupled transmission-line structure is examined to elucidate the detail of leakage effects at higher order of multilayered three-dimensional microwave and millimeter-wave circuits. Two-layer cases are analyzed from a physical perspective and the total number of first higher order leaky modes is found to be equal to that of microstrips. One of the two first higher order leaky modes obtained in the two-layer case is weakly attenuated, while the other is strongly attenuated. A high-gain narrow-beam leaky-mode antenna using only the weakly attenuated leaky mode is designed and measured as an application of this broadside-coupled structure, exhibiting a marked beamwidth reduction of 60%. This antenna is the first Yagi-Uda-like array antenna that utilizes the higher order leaky modes of the microstrip, for which the three basic elements-driver, reflector, and director-are stacked in the broadside direction. The attenuation rate can be further reduced by adjusting the strip width of the director. The half-power beamwidth of the leaky-mode antenna applying two-layer broadside-coupled microstrips with a wider top microstrip is measured to be 2.10degrees at 25.20degrees from the broadside at 34 GHz.
URI: http://dx.doi.org/10.1109/TMTT.2002.807839
http://hdl.handle.net/11536/28111
ISSN: 0018-9480
DOI: 10.1109/TMTT.2002.807839
期刊: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume: 51
Issue: 2
起始頁: 440
結束頁: 447
Appears in Collections:Articles


Files in This Item:

  1. 000180980100015.pdf