双环天线对电视中的甚高频频带(VHF)及特高频频带(UHF)都适合,但在甚高频频带中,它更适合于6～12频道。双环天线的结构如图1所示,上下两个圆环的周长都是一个波长左右,中间用两根平行馈电线连接起来。圆环上的电流方向如箭头所示那样上下是同向的,因而两边垂直极化部分 Dual-loop antennas are suitable for both VHF and UHF television, but in the VHF band it is more suitable for 6-12 channels. Double loop antenna structure shown in Figure 1, the upper and lower circumferential length of the two rings are about a wavelength, the middle with two parallel feeder connection. The direction of the current on the ring is the same up and down as shown by the arrow, so that the vertical polarization on both sides