belt是什么意思

用法例句

Utilizing the proximity coupling balance-feed with four-arm inverted L-strip,the impedance bandwidth and circularly polarized bandwidth can be effectively enhanced.

通过选用低介电常数泡沫材料组成叠层微带天线结构,采用宽带功分相移网络和倒L带条近耦合四臂平衡馈电,充分展宽了天线的阻抗带宽和圆极化带宽。