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Figure 1 from Quad-Band Planar Inverted-F Antenna (PIFA) for Wireless Communication Systems | Semantic Scholar
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Compact dual‐band implantable planar inverted‐F antenna with bandwidth enhancement - Shang - 2020 - Microwave and Optical Technology Letters - Wiley Online Library
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Miniaturized Printed Inverted-F Antenna for Internet of Things: A Design on PCB with a Meandering Line and Shorting Strip
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