Research on extremely low-profile wire antennas with electromagnetic band gap reflector

电磁带隙反射器极薄线天线研究

基本信息

批准号：
18560389
负责人：
NAKANO Hisamatsu
金额：
$ 2.14万
依托单位：
Hosei University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

Antenna elements, each with an electromagnetic band gap(EBG) reflector, are analyzed and their radiation characteristics are revealed. The antenna height is chosen to be extremely small(less than 0.07 wavelength).(1) Spiral element : A spiral element is backed by an EBG reflector with an antenna height of 0.05 wavelength. It is demonstrated that an approximately 83% size reduction can be realized.(2) Curl element : A curl antenna is backed by an EBG reflector with an antenna height of 0.06 wavelength. It is found that the curl can match a 50-ohm feed line with an appropriately chosen width for the feed conductor near the antenna input.(3) Inverted F-element : A two-element array is made with an EBG reflector, where the antenna height is chosen to be 0.03 wavelength. The radiation characteristics for in-phase and opposite phase excitations are investigated. The bandwidth of VSWR is 10% for the in-phase excitation, and that for the opposite phase excitation is 21%.(4) Folded wire element : A folded wire element is located at 0.06 wavelength above an EBG reflector. It is revealed that the radiation resistance is higher, due to the presence of the EBG reflector, than that when a perfect electric conductor backs the folded wire element.(5) Patch element : An EBG reflector surrounds a circularly polarized patch. The EBG reflector can make the cross-polarization component small. The antenna gain is investigated for two cases : one case with conducing pins and the other without conducting pins.

分析了电磁带隙（EBG）反射器的天线元件，并揭示其辐射特性。天线高度被选择为极小（小于0.07波长）。（1）螺旋元件：螺旋元件由天线高度为0.05波长的EBG反射器支持。证明可以实现大约83％的尺寸减小。（2）卷曲元素：卷曲天线由天线高度为0.06波长的EBG反射器支持。发现卷曲可以匹配50欧姆进料线，并适当选择了天线输入附近的进料导体的宽度。（3）反向f-元素：用EBG反射器制成两元素的阵列，其中两元素阵列在其中制成。天线高度被选择为0.03波长。研究了相反相激发的辐射特征。对于同相激发，VSWR的带宽为10％，相反的相位激发为21％。（4）折叠线元件：折叠线元件位于EBG反射器上方的0.06波长。据揭示，由于EBG反射器的存在，辐射电阻较高，而当完美的电导导体返回折叠的线元件时，辐射电阻更高。（5）斑块元件：EBG反射器围绕着圆形极化的贴片。 EBG反射器可以使交叉极化组分小。研究了两种情况的天线增益：一个有诱使引脚的情况，而另一例无需引脚。