A novel printed monopole antenna with simple, low-profile and convenient design is presented in this paper. The antenna composes of a printed monopole antenna and a folded-line stepped impedance resonator (SIR) loaded on the bottom of the substrate. The resonant frequency is decreased by the coupling between the folded-line SIR as the near-field resonant parasitic (NFRP) element and radiation patch of the monopole antenna. The stronger the coupling, the lower the frequency. At the same time, the introduction of the NFRP element does not require an additional circuit for impedance matching, a novel the printed monopole antenna can be achieved. After analyzing the principle of the proposed antenna, a sample antenna has been manufactured and measured to prove the estimated performance of the proposed antenna. The measured results of the proposed antenna are consistent with the simulation, which shows that the design method in this paper is accurate and effective.

本文提出了一种新颖，简单，低调，方便设计的印刷单极天线。该天线由一个印刷单极天线和一个装在基板底部的折线步进阻抗谐振器（SIR）组成。通过作为近场共振寄生（NFRP）元件的折叠线SIR与单极天线的辐射贴片之间的耦合，可以降低共振频率。耦合越强，频率越低。同时，NFRP元件的引入不需要用于阻抗匹配的附加电路，可以实现新颖的印刷单极天线。在分析了所建议天线的原理之后，已经制造并测量了一个示例天线，以证明所建议天线的估计性能。