摘要
为了克服微带天线的横向尺寸需要满足半个波长的限制,本文提出了一种基于复合左右手传输线技术的二元阵天线.该天线阵由结构相同的两个天线阵单元构成天线阵单元由3个辐射片、辐射片之间的交指电容和导通辐射片和接地板的短路针组成.辐射片、短路针、天线阵的基片和接地板构成了复合左右手传输线结构.天线阵单元之间通过弓形连接线连接,通过调节弓形连接线两个端口到馈源之间的距离来调节天线阵单元之间的初始相位差.在关心频段内,数值计算得到的二元阵天线的S参数与实际测量结果符合得很好,并且零阶谐振频率与用等效电路理论得到的谐振频率相一致.通过测量得到该二元阵天线的峰值增益达到6.3dB,提高了天线的增益.二元阵天线工作在零阶谐振频时,天线阵单元的物理尺寸约为0.28λ0×0.1λ0,其中λ0为零阶谐振波长.本文为天线的小尺寸化指出了新的途径.
To overcome the limitation that the linear transverse dimension of microstrip antenna is of the order of half wavelength,a two-element antenna array has been proposed with composite right /left-handed transmission line metamaterials in this paper.The antenna array is made of two same antenna elements.Each element consists of three radiating patches,interdigital capacitance between two radiation patches and shorted pin connecting radiating patch with ground plane.Therefore,a composite right /left-handed transmission line metamaterials is constituted by radiating patch,shorted pin,antenna of substrate and ground plane.An arched microstrip line is used to connect two antenna elements.The phase difference between two antenna elements is set by adjusting the length of arched microstrip line.S parameters of antenna array obtained by numerical computation are in good agreement of that obtained by measurement.Meanwhile,zeroth-order resonant frequency of two-element antenna array is consistent with that estimated by the circuit theory with extracting equivalent circuit parameters of composite right /left-handed transmission line metamaterials.The peak gain of this antenna array is 6.3dB.Seen from this point,the antenna peak gain is enhanced.When operating in the zeroth-order resonant frequency,physical dimensions of this antenna element are reduced to 0.28λ0 × 0.1λ0.Here λ0 is a zeroth-order resonant wavelength.The proposed antenna array is a novel venue for antenna miniaturization.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第5期306-310,共5页
Acta Physica Sinica
基金
西北工业大学基础研究基金(批准号:NPU-FFR-JC201013)资助的课题~~
关键词
天线
异向介质
左右手传输线
增益
antenna
metamaterials
right /left-handed transmission line
gain
