Dielectric ceramic coaxial resonators have been used in microwave commmunation field, they have three basic structures.
介质陶瓷同轴谐振器广泛用于微波通讯领域，它有三种基本结构。
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As one of the field coverage methods, leaky coaxial cables can be used not only in the wireless communication systems in tunnels, but also in to the indoor wireless communication systems.
Utilizing the field matching method, we present an analytic formula for calculating the characteristic impedance of rectangular coaxial transmission lines.