Dual band antenna

具有简单且紧凑的结构的一种双频带天线包括一个电感器、连接在该电感器相对两端的第一及第二棒状辐射元，其中有电介质材料环绕着该电感器并环绕着位于电感器各个端上的第一和第二辐射元的连接部。一个导电外壳围绕着所述电介质体，并支撑着所述电感器以及第一和第二辐射元的连接部。外壳和电介质体构成了一个电容，这样该电容就和所述电感器一起构成了一个LC谐振电路。设计所述LC电路，使得在双频工作频带的较高一个频带上，只有一个辐射元执行辐射，而在较低频带上，两个辐射元都能执行辐射。 A dual band antenna with a simple and compact structure includes an inductor, first and second rod-like radiating elements connected to opposite ends of the inductor, with dielectric material surrounding both the inductor and the joining portions of the first and second radiating elements on the respective ends of the inductor. A conductive housing surrounds the dielectric and supports the inductor and the joining portions of the first and second radiating elements. The housing and dielectric create a capacitance, so that an LC resonant circuit is formed in conjunction with the inductor. The LC circuit is designed such that only one radiating element radiates at the higher band of the dual operating band, whereas both radiating elements radiate at the lower band.