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许多种设计成能以圆极化方式工作的天线,都是由正交线极化振子对组成的,正交混合电路和该混合电路与天线之间的两根等长度电缆向振子对提供幅度相等而相位差为90°的信号。十字形半波长偶极天线是大家熟悉的一个例子。这种天线往往用于抛物面反射器天线作圆极化馈电用,也用于短逆弧天线(如图1所示)。通过用于圆极化的正交混合电路馈电的正交振子对天线的其它例子有四线螺旋天线、四圈锥形螺旋线、某些甚高频绕杆式天线和十字形对数周期偶极天线阵。
Many antennas designed to operate in a circularly polarized manner are comprised of pairs of orthogonal linear polarizers. The quadrature hybrid and the two equal length cables between the hybrid and the antenna provide amplitude to the pair of transducers Equal and phase difference of 90 ° signal. A cross-shaped half-wave dipole antenna is an example that everyone is familiar with. This type of antenna is often used for circularly polarized feed for parabolic reflector antennas as well as for short reverse arc antennas (Figure 1). Other examples of quadrature dipole-fed antennas fed by quadrature hybrid circuits for circular polarization are quadrifilar helix antennas, quadruple conical helixes, some very high frequency convoluted antennas, and a cross-logarithmic period Dipole antenna array.