This paper presents design of a tri-band slotted patch antenna operating at millimetre-wave frequencies of 28 GHz, 38 GHz and 61 GHz. The proposed antenna carries an overall size of $5.1mm\times 5mm\times 0.254mm$ employing a single layer, slotted patch structure combining L- and F-shaped slots. It is excited by a single-feed microstrip line. The antenna is tested in free space as well as in wearable configurations and results show that it offers a good impedance matching, sufficient -10 dB bandwidth and wide radiation coverage at the three bands of interest effectively countering the effects of human body presence. It achieves a peak gain of 7.2 dBi in off-body and 8.3 dBi in on-body configuration. Minimum efficiency values are observed to be 85% in off-body while 54% in on-body scenarios. A comparative analysis with published relevant work shows that the proposed antenna is inexpensive, easy to integrate and works efficiently in tri-band wearable and implantable arrangements. These features make it a good candidate for current and future applications of Body-centric Networks operating at millimetre-wave ranges.

本文介绍了在28 GHz，38 GHz和61 GHz毫米波频率下工作的三频带缝隙贴片天线的设计。拟议中的天线的总体尺寸为$5。\mathrm{1个}米米\times 5米米\times 0。254米米$采用结合了L和F形槽的单层开槽贴片结构。它由单进料微带线激发。该天线在自由空间和可穿戴配置中进行了测试，结果表明，该天线具有良好的阻抗匹配，足够的-10 dB带宽和在三个目标频段的宽辐射范围，可有效抵抗人体的影响。在体外，它的峰值增益为7.2 dBi，在人体上的配置为8.3 dBi。观察到最低效率值在体外为85％，而在体外情况下为54％。与已发表的相关工作进行的比较分析表明，所建议的天线价格低廉，易于集成并且可以在三频可穿戴和可植入装置中高效工作。