Filtering Gysel power divider with arbitrary power splitting ratio

Abstract

A novel filtering Gysel power divider (PD) structure based on coupled lines is presented to realize arbitrary power splitting ratio and filtering response. The proposed filtering PD consists of three parallel‐coupled lines, two short‐circuited stubs, two stepped impedance stubs and two grounded isolation resistors. Two transmission zeros (TZs) are introduced by the stepped impedance stubs, which can greatly improve the passband selectivity and out‐of‐band rejection performances. Theoretically, closed‐form equations for the proposed structure are derived based on even‐odd mode method. For verification, two filtering Gysel PDs with equal and unequal power splitting ratios ( PnormalR=1 normalanormalnnormald PnormalR=2) are designed and experimentally demonstrated in this paper.

Quadrature entanglement in the microwave domain with a phase locking protocol

“…where η 1 is the power transmittance of the power divider PD1 [31,32], E 1 is the input to the 180 • hybrid ring coupler for interfering with E 2 and generating quadrature entangled states, E 1 is the input to the feedback processor to obtain the current phase difference θ, which should be locked accurately. The outputs of the 180 • hybrid ring coupler can be expressed as…”

Compact unequal filtering power divider operating in two bands with controllable characteristic impedances

“…, a tunable dual‐band filtering PD with high selectivity and changeless bandwidth is presented, where the size is somewhat large. Furthermore, an FPD with unequal power division ratio and filtering response in one band is presented, which is based on coupled lines …”

“…Furthermore, an FPD with unequal power division ratio and filtering response in one band is presented, which is based on coupled lines. 7 Considering the difficulties in constructing the same impedance transform of different bands simultaneously, unequal dual-band filtering PDs are hard to design and rarely reported. The major purpose of this article is to propose a simple and effective design method for FPDs with unequal power splitting ratio, dual-band frequency selectivity and compact size.…”