The QFH (Quadrifilar Helix) antenna is a type of circularly polarized antenna commonly used in radio communications and remote sensing applications. It is known for its omnidirectional reception and transmission capabilities, making it well-suited for applications that require consistent signal reception from any direction.

The design of the QFH antenna consists of two orthogonal loops wound in a helical shape, hence the name "quadrifilar helix." These loops are typically constructed using copper or other conductive materials. The helical winding of the loops helps to achieve circular polarization, which means the antenna can receive or transmit signals with both horizontal and vertical polarization simultaneously.

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