Tri‐band filtering power divider based on multi‐mode fork‐type resonator for performance enhancement

Abstract

A new microstrip tri‐band filtering power divider (FPD) with favourable filtering and isolation performance based on the tri‐mode fork‐type resonator is presented in this study. By constructing the coupling scheme between the input transmission line and two pairs of symmetric fork‐type resonators, a nice tri‐passband filtering power division response can be easily achieved without an additional matching network. Meanwhile, the desired port‐to‐port isolation is attained by elaborately arranging two resistors between the symmetrical resonators with respect to the central input line. To demonstrate the authors’ design concept, one tri‐band FPD prototype is implemented with good agreement between the simulation results of the electromagnetic simulation software and the measurement results of the vector network analyser. Results show that the new tri‐band FPD exhibits sharp roll‐off with five transmission zeros at passband edges, 17.1 dB harmonic suppression up to 4.6 GHz [2.35f0 (f0 = 1.95 GHz)], and better than 15.7 dB in‐band isolation.

Miniaturized Power Divider With Triple-Band Filtering Response Using Coupled Line

“…Due to the rising need for multi-frequency modern wireless technologies, the requirement for multiband FPDs is of the highest importance at the moment. The literature has various dual-band FPDs [9][10][11], however, research on triple-band FPDs [12][13] is still in its infancy.…”

“…The impedance ratio of the SIR controls the two frequencies (lower and higher), while a half-wavelength resonator tunes the middle frequency. Utilizing fork-shaped type triple mode resonators [13], connected through input/output lines, the tri-band FPD structure has been investigated. By placing two resistors between two pairs of symmetrical resonators centred on the central input feed line, the isolation between the ports is also increased.…”

Analysis and design of high selective triple‐band filtering power dividers

“…Nevertheless, most of researches done so far have focused themselves on the design of dual-band FPDs [4][5][6][7][8] and only a few works are on triple-band FPDs. [9][10][11] For instances, a triple-band FPD has been proposed by replacing coupled shortcircuited stepped-impedance resonators (SIRs) in conventional Wilkinson PD (WPD). 9 In a similar way, different signal-interference loop resonators are adopted in WPDs to achieve multi-passbands response.…”

“…9 In a similar way, different signal-interference loop resonators are adopted in WPDs to achieve multi-passbands response. 10,11 Unfortunately, most of the reported designs of triple-band FPD fail in providing synthesis design method with a set of complete closed-form analytical equations for any prespecified response of high selective triple-band filtering passbands.…”

A simple triple‐band coupled line filtering power divider design

“…Most of the research has focused on the design of dual-band FPDs 5,6 and only a few works on triple-band FPDs. 7,8 For instances, a triple-band FPD has been proposed by replacing coupled short-circuited steppedimpedance resonators in conventional Wilkinson power divider. 7 Unfortunately, few triple-band FPD is designed based on analytical equations with any pre-specified triple passbands filtering response.…”