Dual-Wideband Filtering Power Divider With Good Isolation and High Selectivity

In this article, a dual‐band filtering power divider with unequal power‐division ability is proposed. Different from conventional equal power dividers constructed by filters or coupled resonators, noncoupled structures are employed in this design. As a result, low‐loss characteristic is realized for the proposed power divider. In this proposed structure, the dual‐band unequal power allocation is realized by replacing conventional single‐band λ/4 transformers with dual‐band ones (T‐junction structures). Three identical λ/4 stepped impedance resonators are properly attached to all the three ports of the proposed power divider to generate an extra transmission zero between two operational bands. Therefore, a filter‐like shaping in its S‐parameter results is obtained. A resistor is located between two outputs for output isolation. Mathematical derivations of the overall design procedure are also provided based on the circuit models and transmission line theory. Meanwhile, a resistor for output isolation is also included between two outputs, whose value can be calculated using given equations. For validation, a prototype operating at 0.9 and 2.1 GHz are designed, fabricated, and measured. The isolations between two outputs are 30 and 26 dB while the phase differences are only 2.5°and 4.9° at 0.9 and 2.1 GHz in the measurement, indicating good consistence of outputs. Measured |S21| and |S31| are −(1.76 + 0.3) dB, −(4.77 + 0.2) dB at 0.9 GHz and −(1.76 + 0.6) dB, −(4.77 + 0.5) dB at 2.1 GHz.

Section: Analysis Of Frequency Ratio and Power Division Ratiomentioning

confidence: 99%

“…3. Set θ 2 = θ 1 and θ 4 = θ 3 , and then get the values of θ 1 , θ 3 , Z 1 , Z 2 , Z 3 , and Z 4 according to the requirement of f 1 and f 2 based on Equations (4)- (14). 4.…”

Section: Design Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dual‐band filtering power divider with unequal power division ratio and low‐loss characteristic

Shao

Zhu

et al. 2020

“…The filtering power divider (FPD) is such an integrated device that provides both frequency band selection as a filter and power splitting/combining as a PD. For dual‐band operation and application, dual‐band FPDs (DB‐FPDs) are desired and have been developed …”

Section: Introductionmentioning

confidence: 99%

“…For dual-band operation and application, dual-band FPDs (DB-FPDs) are desired and have been developed. [1][2][3][4][5][6] In Refs. 1,2, DB-FPDs were proposed by replacing the quarter-wavelength (λ/4) transformers in the conventional Wilkinson PD with a centrally loaded resonator based dualband filtering structures.…”

mentioning

confidence: 99%

Dual-band filtering power divider with widely separated passbands

Zhang

Qian

Yang

2018

Self Cite

This article presents a dual‐band microstrip filtering power divider with widely separated passbands. The design topology is mainly constructed by two pairs of dual‐mode resonators, an open‐ended input line and two T‐shaped output lines. Owing to the field symmetry at the two sides of the input line, two identical signals are coupled to the resonators and finally transmitted at two output ports. Since each pair of the employed dual‐mode resonators can be independently designed, widely separated dual‐passbands response is specified and derived in this work with the even‐mode/odd‐mode analysis. Moreover, good isolation with wide isolated frequency band is realized by introducing resistors between each pair of resonators. To validate the design concept, a prototype centering at 2.39 and 3.83 GHz is implemented following the given design procedure. Measured results of the fabricated circuit agree well with the simulated ones, exhibit high frequency selectivity, good port‐to‐port isolation, and port matching.

Design of a wideband filtering power divider with good in‐band and out‐of‐band isolations

Liu

Sun

et al. 2019

In this article, a wideband filtering power divider with good in-band and out-of-band isolations is designed based on a hybrid Wilkinson and Gysel structure. To achieve a good in-band response, two additional in-band transmission poles can be introduced by installing the coupled-line structures at each port. By mounting a stepped impedance open stub at the input port, two transmission zeros are generated near the passband to improve the passband skirt. Furthermore, the out-of-band rejection and isolation are achieved by the other two transmission zeros, which are produced by the open stub and the three coupled-line sections mentioned above. Additionally, a good in-band isolation is realized by the isolation resistor between output ports. For the demonstration, a wideband filtering power divider centered at 1.5 GHz with a 56% fractional bandwidth and 20-dB isolation is designed and fabricated. The simulated and measured results are in good agreement with each other. K E Y W O R D Sfiltering power divider, Gysel, isolation, wideband, Wilkinson