Low-cost E-band Lange coupler with vialess load

Abstract

A vialess E-band Lange coupler is presented. The design combines a novel 'pseudo-dot' termination with impedance matching techniques. The multiple stage impedance matching network technique is used to design a 50 ω Lange coupler. The 'pseudo-dot' termination provides a suitable load to the isolation port, avoiding via connection to ground, thus reducing the cost of the fabrication process. The design achieves better than 2 dB insertion losses in the through and coupled paths with < 0.8 dB amplitude and ±2° phase errors for the entire E-band.