2015年3月10日 · This algorithm is used in conjunction with multi-objective optimization to create two quadrifilar helix antennas (QHAs) and one monopole antenna, all with unique electromagnetic performances.

The characteristics of the quadrifilar helix antenna [1] and [2], a broad-band high-gain device, are described in detail. Experimental data on beam patterns, impedance, and axial ratio are given for both the circularly polarized quadrifilar helix antenna (QHA) and the linearly polarized counterwound quadrifilar helix antenna (CQHA).

We first look at the monofilar helix antenna to establish a starting baseline for comparison with the quadrifilar antennas and to show a useful impedance matching method.

QFH stands for Quadrifilar Helix or Quadrifilar helicoidal. It provides link to Quadrifilar Helix Antenna Calculator which is useful to design QFH antenna. QFH antenna is one among various antennas used to capture images from low level non geosynchronous satellites.

2020年12月29日 · 四臂螺旋式天线(Quadrifilar Helix Antenna )四臂螺旋式天线一般由四条按特定规则弯曲的金属线条镶于圆柱形陶瓷基材上，无需任何接地。 它具备有Zapper天线的特性，也具备有垂直天线的特性。

2024年3月15日 · A quadrifilar helix antenna (QHA) is a type of antenna that consists of four helical wires wound around a central axis. It is designed to receive circularly polarized signals, which are commonly used in satellite communications as well as RFID .

Description of the construction of a quadrifilar helicoidal antenna. This model is for meteorological satellites, but a calculator is provided to adapt measure to other frequencies. Construction is cheap, and materials are easily available.

Quadrifilar Helix Antenna (QFHA) frequently asked questions and information when used with Low Earth Orbiting (LEO) satellites/Amateur Radio satellites.

John Coppens ON6JC/LW3HAZ describes how to make a Quadrifilar Helicoidal antenna Taming the QFH Antenna by Bill Sykes G2HCG and Bob Cobey G0HPO

The quadrifilar helicoidal antenna - quite a mouthful - is easy to construct (even though it does look complicated), and the results are excellent. In contrast with the omnipresent turnstile antenna (two crossed dipoles with a reflector) the circularity is almost perfect in any direction.