Ultra-wideband antenna with dual-band rejection characteristics

Ultra-Wideband Antenna with Dual-Band Rejection for WiMAX and WLAN Using a Single Folded Parasitic Element

This technology features a parasitic element that extends from the top edge of the substrate, wraps around the side, and continues onto the bottom. It enables a 3.1–10.6 GHz ultra-wideband range while simultaneously filtering out two interference bands.

While UWB communication offers high-speed transmission and low power consumption, it overlaps with WiMAX (3.4–3.7 GHz), C-band (3.7–4.2 GHz), and WLAN (5.15–5.85 GHz), causing interference. Previously, blocking multiple bands required adding separate structures, which increased antenna complexity, size, and production costs.

This design uses a second parasitic element folded onto the bottom, consisting of two parallel conductors, a connecting conductor, and a vertical conductor. By adjusting their dimensions, it achieves VSWR > 2 rejection at 3.4–4.2 GHz and 5.15–6.00 GHz. Ideal for short-range high-speed modules, indoor positioning tags, and UWB radar, it reduces both footprint and costs.

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Key Features:

• A radiator mounted on the top of the substrate for transmitting and receiving electromagnetic waves, and a feed section with a feed line supplying electrical signals to the radiator.
• A parasitic element section spaced apart from the radiator, formed in a structure that folds from the top edge of the substrate, across the side, to a portion of the bottom.
• A first parasitic element mounted in a rectangular shape on the top edge, and a second parasitic element extending from it, passing through the side of the substrate, and folding onto the bottom.
• The second parasitic element includes first and second parallel conductor parts, a third conductor part connecting them, and a fourth conductor part extending perpendicularly from the center of the third conductor part.

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