Due to excellent stop band and slow wave characteristics, they are applied to filters, resonators, directional couplers, diplexers and antennas.
由于其优良的带阻、慢波等特性，它们被广泛地应用于滤波器、谐振器、定向耦合器、双工器和天线中。
2
In this paper the directional characteristics of elliptic array antennas is studied and the fact that a linear array and a circular array is the especial cases of an elliptic array was proved.
对椭圆形阵列天线的方向特性进行了研究，证明了直线阵和圆环阵是椭圆形阵的特例。
3
We mainly use air microstrip antenna and four-dipole antenna as the antenna elements. Directional array antenna which is composed of two antennas is analyzed, simulated and designed.