P. O. Afanasiev, V. A. Sledkov, M. B. Manuilov

A novel modification of two-way wide-band strip-line power divider for microwave applications is presented, successfully manufactured and tested. The measurements confirm that proposed power divider shows low insertion loss, low amplitude and phase unbalance, high isolation of ports and high impedance matching. Computer aided design of power dividers is based on finite integration technique and circuits theory. The structure under consideration is based on strip-lines with side coupling. The effect of resistor shape on isolation of power divider ports is carried out. A new way to improve isolation is suggested. The performances of strip-line power dividers have been improved by means of introducing the capacitive strips placed on the back side of printed board opposite to resistor. Due to this modification of basic structure the high-quality power dividers with the standard commercially available resistors have been fabricated for frequency band 8-18 GHz. The proposed power divider structure has dramatically improved electrical performances within the over-octave operating frequency band 8-18 GHz. The amplitude unbalance is less then ±0.1 dB, the phase unbalance is less then ±2 degree, insertion loss is 0.3 dB, isolation is equal -21 dB, VSWR=1.35. On the other hand, the important advantage of proposed power divider is its compact size. The printed board dimensions are 14×20 mm.