Miniaturized UWB offset power divider with reflection cancellation and enhanced isolation

Abstract

In this paper, a miniaturized, ultra-wideband, dual-section, two-way offset power divider, covering the frequency range from 0.6 to 6 GHz, with reflection cancellation and enhanced isolation, is presented. The divider small form factor is achieved through the use of a π-structure that replaces the λ/4 transmission lines in each of the divider's sections. The dimensions of the open stubs forming this structure are adjusted so as to present minimum reflection at twice the design frequency; this, together with using two-transformer sections, serve to obtain the divider ultra-wideband operation despite using a two-way offset structure only. The implemented design provides an average insertion loss of 0.4 dB, an average isolation of 18 dB and an output return loss of better than 12 dB throughout the whole operation bandwidth 0.6–6 GHz, (a fractional bandwidth of approximately 164%). To the authors' knowledge, this is the widest achieved bandwidth using merely a two-way offset divider with reflection cancellation performance.