In this paper, a simple and efficient method to increase the gain and bandwidth of the wearable antennas used in several medical/communications systems is presented. To increase the gain and bandwidth simultaneously, the triple transmission lines (TTLs) method has been used. With this method, the frequency ranges of 1.7–2.5 and 5.4–5.95 GHz are covered with dual-band responses. Also, the simulated maximum gain at 2 and 5.8 GHz is equal to 8.26 and 9.86 dB, respectively. Using the TTLs method, the second frequency band (5.4–5.95 GHz) is achieved. Also, the gain improvement in operating frequencies is more than 4 dB compared to the conventional antenna. The dimensions of the proposed wearable high-gain antenna are 80 × 92 × 2 mm3 or 0.57 × 0.67 × 0.01 λg3 at 2 GHz. Finally, a dual-band sample antenna for use in medical systems was fabricated with a flexible felt substrate and its characteristics were measured. There is a good fit between the measurement and simulation results.

中文翻译：

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一种同时增加用于医疗/通信系统的可穿戴天线的增益和带宽的简单方法

在本文中，提出了一种简单有效的方法来增加用于多个医疗/通信系统的可穿戴天线的增益和带宽。为了同时增加增益和带宽，使用了三重传输线 (TTLs) 方法。使用这种方法，双频响应覆盖了 1.7–2.5 和 5.4–5.95 GHz 的频率范围。此外，在 2 和 5.8 GHz 处的模拟最大增益分别等于 8.26 和 9.86 dB。使用 TTLs 方法，实现了第二个频段（5.4-5.95 GHz）。此外，与传统天线相比，工作频率的增益提高超过 4 dB。建议的可穿戴高增益天线的尺寸为 80 × 92 × 2 mm3或 0.57 × 0.67 × 0.01λG3在 2 GHz。最后，用柔性毡基板制造了用于医疗系统的双波段样品天线，并测量了其特性。测量结果与仿真结果吻合良好。