Dual-Band/Tri-Band/Broadband CPW-Fed Stepped-Impedance Slot Dipole Antennas
Dual-Band/Tri-Band/Broadband CPW-Fed Stepped-Impedance Slot Dipole Antennas
复制标题
DOI：
10.1109/tap.2013.2287523
复制
发表时间：
2014-01-01
影响因子：
5.7
通讯作者：
Tu, Wen-Hua
中科院分区：
文献类型：
--
作者：
Chen, Shih-Wei;Wang, Deng-Yin;Tu, Wen-Hua
在本研究中，两个多频天线和一个宽频天线使用开槽阶梯阻抗共振器（SIR）和共面波导（CPW）馈电进行了研究。所有建议的天线上制作的1毫米FR4基板的相对介电常数为4.4和损耗角正切为0.02。与传统的均匀阻抗谐振器（UIR）相比，SIR显示出对寄生响应的更好控制。以这种方式，可以在期望的频带设计双频带天线（天线A）和三频带天线（天线B）。天线A以中心频率（f（0），f（S1））=（1.5 GHz，3.5 GHz）实现，天线B以中心频率（f（0），f（S1），f（S2））=（1.5 GHz，3.5 GHz，5.5 GHz）实现，其中f（0）是基频。宽带天线（天线C）的设计是通过分配前三个谐振频率足够接近，以实现98.7%的分数带宽与大于6 dB的回波损耗从1.5 GHz到4.4 GHz。此外，为了解决天线A和B的宽边方向上的零辐射问题，在主辐射谐振器附近添加寄生槽，以便在高阶模式频率处实现几乎全向的辐射方向图。
In this study, two multi-band antennas and one broadband antenna using slot stepped-impedance resonators (SIRs) and coplanar waveguide (CPW) feeding have been investigated. All of the proposed antennas are fabricated on 1-mm FR4 substrates with a relative dielectric constant of 4.4 and a loss tangent of 0.02. In comparison to the conventional uniform-impedance resonator (UIR), the SIR shows a better control over spurious response. In this way, a dual-band antenna (antenna A) and a tri-band antenna (antenna B) could be designed at desired bands. Antenna A is implemented with center frequencies (f(0), f(S1)) = (1.5 GHz, 3.5 GHz), and Antenna B is realized with center frequencies (f(0), f(S1), f(S2)) = (1.5 GHz, 3.5 GHz, 5.5 GHz), where f(0) is the fundamental frequency. The broadband antenna (antenna C) is designed by allocating the first three resonant frequencies close enough to achieve a 98.7% fractional bandwidth with a return loss of greater than 6 dB from 1.5 GHz to 4.4 GHz. Furthermore, to tackle the null radiation problem at the broadside direction of antennas A and B, parasitic slots are added near the main radiating resonators so as to achieve nearly omni-directional radiation patterns at the high-order mode frequencies.