天线第十四讲-天线测量

电磁波传输的损量电平,一般小于交叉极化:电磁波传输过程中与原极化分量正交的分小于反射率电平:各种反射场与直射场的比值,一般要求区,静区须大于待测天线; 静区:各种杂散干扰最小的区域,待测天线按放在静Р Р -Р 40dBРSchool of Electronic & Information Engineering & Information Electronic of School Research of Institute TechniquesAntennas & RF Р ,对于低副瓣天线测量要求Р -Р 25dBР Р 2dBР Р ,横向正负Р Р Р Р 0.25dBР -Р 60~Р -Р 70dBРSouth China University of Technology Р Р 14.3 14.3Р Р 远区条件:Р Р 于一般要求照射到天线孔径时中心和边沿的相位差小:电磁波照射到待测天线时为均匀平面波远场测量时,收发天线距离足够远,满足远场条件Р p/8Р 远区条件Р ,这时距离应满足:РSchool of Electronic & Information Engineering & Information Electronic of School Research of Institute TechniquesAntennas & RF Р Р RР Р 2Р Р DР 2РSouth China University of Technology Р Р 在远场区,方向图与距离无关Р РSchool of Electronic & Information Engineering & Information Electronic of School Research of Institute TechniquesAntennas & RF Р :