A broadband compact antenna is proposed in this paper with an enhanced broadside gain performances in the +/− z directions. A design method of complementary gains is presented to overcome the gain reduction caused by the cancellation of reverse currents in the middle of the band of interest, where a design equation of the excited element of the antenna is given. This objective is achieved by accurately analyzing the resonant modes of the two parallel connected antennas of the excited element in order to achieve an overall wideband radiator. An orthogonal radiating choke (ORC) is proposed to remove the gain depression due to the leakage of electromagnetic waves toward the upper portion of the band of interest through simultaneously enhancing the broadside gain and choking the end-fire travelling wave. Each one patch of the ORC acting as both a TM ₁₀ mode microstrip antenna and a choke of end-fire travelling wave. With the help of the ORC, the gain in +/− z directions is enhanced by 13.1 dB at 6 GHz compared to that without the ORC. The proposed antenna presents a realized broadside gain of 2.1-7.8 dBi in the +/− z directions within a bandwidth of 158% (700 MHz – 6 GHz). Both the simulated and measured results demonstrate that the proposed antenna exhibits desirable bandwidth and gain characteristics and is a promising candidate for broadband integrated wireless systems.

中文翻译：

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具有正交辐射扼流圈的紧凑型宽带天线，用于增强宽边增益

本文提出了一种宽带紧凑型天线，在 +/- z 方向上具有增强的宽边增益性能。提出了一种互补增益设计方法，以克服感兴趣频带中部反向电流抵消引起的增益降低问题，并给出了天线激励元件的设计方程。这个目标是通过准确分析激发元件的两个并联天线的谐振模式来实现的，以实现整体宽带辐射器。提出了一种正交辐射扼流圈（ORC），通过同时增强宽边增益和扼流端射行波来消除由于电磁波向感兴趣频带的上部泄漏而导致的增益下降。ORC 的每一块都充当 TM ₁₀模微带天线和端射行波扼流圈。在 ORC 的帮助下，与没有 ORC 的情况相比，6 GHz 时 +/- z 方向的增益提高了 13.1 dB。建议的天线在 158%（700 MHz – 6 GHz）的带宽内，在 +/- z 方向上实现了 2.1-7.8 dBi 的宽边增益。仿真和测量结果都表明，所提出的天线具有理想的带宽和增益特性，是宽带集成无线系统的有希望的候选者。