A Balanced-to-Balanced In-Phase Filtering Power Divider With High Selectivity and Isolation

Abstract

In this paper, a balanced-to-balanced (BTB) inphase filtering power divider (FPD) is proposed, which can realize a two-way equal power division with high selectivity and isolation. The design of the proposed FPD is primarily based on microstrip/slotline transition structures and slotline T-junction. A U-type microstrip feed line integrated with a stepped-impedance slotline resonator is adopted at the input and output ports, which makes the differential-mode (DM) responses independent of the common-mode (CM) ones. Meanwhile, superior DM transmission and CM suppression are achieved intrinsically, thereby simplifying the design procedure significantly. By employing slotline resonators loaded with resistors, the isolation between the two output ports can be improved greatly. In addition, a DM passband with a sharp filtering performance is realized by introducing the microstrip stub-loaded resonators (SLRs). By changing the electrical length of the open-stub of the SLR, the fractional bandwidth (FBW) is controllable. In order to verify the feasibility of the proposed design method, two prototype circuits of the proposed FPDs with different bandwidths are fabricated and measured. Good agreement between the simulation and measurement results is observed.

A 1‐to‐ n way single‐ended‐to‐balanced substrate integrated waveguide filtering power splitter

“…The main performances of the proposed 1‐to‐ n way SIW SETBFPS and the state‐of‐the‐art balanced power splitters are summarized in Table . Comparing with the reported balanced power splitters, the proposed approach has all the functions of 1‐to‐ n way, filtering, single‐ended‐to‐balanced power splitting, and CM suppression. Comparing with the reported single‐ended‐to‐balanced power splitters, the prototyped 1‐to‐3 way design shows the performance advantages of low IL, wide bandwidth, 1‐to‐3 way and simple structure.…”

Balanced-to-Balanced Gysel Filtering Power Divider With Arbitrary Power Division

“…In [25], a BTB filtering power divider was designed with hish output isolation only using two square patch resonators. In [26] and [27], a wideband and dual-band BTB filtering power divider were presented respectively with high frequency selectivity using similar structure. For the BTB filtering power divider with unequal power division, it was firstly presented in [28] using the same structure presented in [22].…”

A balanced tri‐band bandpass filter with high selectivity and controllable bandwidths

“…With the rapid development of wireless electronic systems, balanced circuits have been utilized more and more widely because of the excellent performance in terms of the immunity against environmental noise. For the common‐mode (CM) performance, balanced feed structure can greatly improve the CM suppression compared with the single‐end counterparts as shown in References and . The differential‐mode (DM) response was independent of the CM response because the CM signals were blocked in the balanced feed structures.…”