| 摘要 |
PURPOSE:To prevent transmission-reception separability from deteriorating by improving the impedance viewed from a transmission line to an antenna element, by using a power distributor of a reflected-wave absorptive type. CONSTITUTION:Antenna element units are nearly equal in impedance and the VSWR is approximate 1 or 2; although waves are transferred to J2 and J3 of PD-2 via transmission lines W1 and W3, W3 is half-wavelength longer than W1, so that a phase difference between ANT1 and ANT2 will becomes out of phase between J2 and J3. Consequently, PD-2 absorbs reflected waves from ANT1 and ANT3 inside of it and at the same time, the VSWR viewed from input terminal J1 nearly becomes that of only PD-3. |
