Compact Ultra-Wideband Wilkinson Power Dividers Using Linearly Tapered Transmission Lines (original) (raw)
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NON-UNIFORM TRANSMISSION LINE ULTRA-WIDEBAND WILKINSON POWER DIVIDER
Progress In Electromagnetics Research C, 2013
We propose a technique with clear guidelines to design a compact planar Wilkinson power divider (WPD) for ultra-wideband (UWB) applications. The design procedure is accomplished by replacing the uniform transmission lines in each arm of the conventional power divider with varying-impedance profiles governed by a truncated Fourier series. Such non-uniform transmission lines (NTLs) are obtained through the even mode analysis, whereas three isolation resistors are optimized in the odd mode circuit to achieve proper isolation and output ports matching over the frequency range of interest. For verification purposes, an in-phase equal split WPD is designed, simulated, and measured. Simulation and measurement results show that the input and output ports matching as well as the isolation are below −10 dB, whereas the transmission parameters are in the range of (−3.2 dB, −4.2 dB) across the 3.1 GHz-10.6 GHz band.
Nonuniform compact Ultra-Wide Band Wilkinson power divider with different unequal split ratios
Journal of Electromagnetic Waves and Applications, 2019
A compact Ultra-Wide Band (UWB) Wilkinson power divider with different unequal split ratios of 2:1 and 3:1 using three optimized resistors is analyzed, designed and fabricated in this study. A 31.1% size reduction in each λ/4 uniform transmission line (UTL) of the divider is achieved by applying non-uniform transmission lines (NTLs) theory. The proposed divider is contributed to be suitable as a feeder to currently used wireless communication networks such as cognitive radios (CR), resulting in good impedance matching to its entire ports. In addition, the optimized resistors used provided good isolation between the output ports. The simulation is carried out in this study uses High Frequency Structure Simulator (HFSS) software. The simulation results are compared with the hardware measurements to validate the results. It was observed that there was approximately 5% of the difference between simulated and hardware measurements which is within the acceptable limit.
Jordanian journal for computers and information technology, 2020
In this article, compact N-way Ultra Wide Band (UWB) equal and unequal split Wilkinson Power Dividers (WPDs) using exponentially λ/4 Tapered Transmission Line Transformers (TTLTs) are designed. First, 2-way WPDs are designed, simulated and then cascaded to get 4-way (equal and unequal split) and 8-way (equal split) UWB WPDs. 2-and 4-way (equal and unequal split) WPDs are fabricated and tested. The simulated and measured results of all the designed dividers are good in terms of insertion, return losses and group delay through UWB frequency band. The analysis of these dividers is carried out using the commercial ANSYS High Frequency Structure Simulator (HFSS) software package which is based on the Finite Element Method (FEM). Moreover, A MATLAB built-in function "fmincon.m" is used to find the optimum values of the three resistors chosen for perfect isolation. To validate the results, the simulation results are compared with the measured ones.
An ultra wideband Wilkinson power divider
In this article, an ultra wideband power divider is proposed, analysed and designed. The design approach of the proposed power divider is derived from even/odd mode analysis. The design approach is validated, and the power divider is simulated by two full-wave electromagnetic simulators (ADS and Sonnet) and fabricated on a substrate with a thickness of 0.635 mm and relative constant of 10.2. Measured results of the proposed power divider show equal power split, excellent insertion loss and good return loss at all the three ports, and a good isolation between the two output ports is achieved over the specified 3.1– 10.6 GHz ultra wideband range. In the input port return loss, there are two transmission poles around 5.2 and 9.5 GHz. The overall size of the proposed power divider is just 5:8 Â 4:3 mm 2 .
Design of compact wideband unequal wilkinson power divider with improved isolation
International Journal of Engineering & Technology, 2018
In this article, a compact unequal, planar Wilkinson power divider with ultra-wideband operation is proposed. The composed power divider having the size of 11.6 mm × 18.5 mm. It consists of one input and two output branches with individual resistive values. Two isolation resistors are used to provide better isolation between the two output ports. The impedance values of each transmission branch and isolation resistors is varied based on the output power division ratio i.e. (P2/P3). The ADS package simulated results of the designed unequal WPD satisfy the operating range (S11 ≤ -10 dB) from 2.5 GHz to 18 GHz and isolation are obtained over the entire frequency of operation.
Progress In Electromagnetics Research C, 2016
This paper presents 2-way Power Divider (PD) for Ultra-Wideband (UWB) applications. The proposed power divider is realized using two cascaded sections of Wilkinson Power Divider (WPD) of equal characteristic impedances and unequal electrical lengths with inserted open stub to improve matching, isolation and to broaden the bandwidth. It is proved analytically using the "Even Odd Mode" analysis method and the ABCD matrix to obtain exact closed-form design equations. A detailed design methodology is introduced to facilitate the implementation without needing CAD optimization. To verify the proposed design methodology, a 2-way power divider is designed, fabricated on a Rogers RT/Duroid 5880 substrate and compared to other published 2-way microstrip power dividers. Measured data show good agreement with Electromagnetic (EM)-Circuit Co-Simulation, which proves the design equations and methodology. The proposed planar 2-way PD achieves an isolation ≥ 13.5 dB, input return loss ≥ 10 dB, output return loss ≥ 14.5 dB and exceeded insertion loss ≤ 0.9 dB (over the −3 dB splitting ratio) through the whole UWB range from 3.1 GHz to 10.6 GHz. Furthermore, it has a compact area of 22 mm × 15 mm, which provides 50% enhancement over similar microstrip PD circuits while achieving better isolation and matching.
A Novel Design Of A Low Cost Wideband Wilkinson Power Divider
2015
This paper presents analysis and design of a wideband<br> Wilkinson power divider for wireless applications. The design is<br> accomplished by transforming the lengths and impedances of the<br> quarter wavelength sections of the conventional Wilkinson power<br> divider into U-shaped sections. The designed power divider is<br> simulated by using ADS Agilent technologies and CST microwave<br> studio software. It is shown that the proposed power divider has<br> simple topology and good performances in terms of insertion loss,<br> port matching and isolation at all operating frequencies (1.8 GHz,<br> 2.45 GHz and 3.55 GHz).
Radioengineering, 2018
In this paper, a Wilkinson power divider is modified using four-series delta-stub and folded steppedimpedance transmission line (FSITL) in order to achieve a reduced circuit size of 84% and fractional bandwidth of 116%. Series delta-stubs are used instead of open shunt stubs to obtain an optimum shifting frequency and wider bandwidth. Folded stepped-impedance transmission line (FSITL) is used to achieve reduced circuit size. The proposed power divider is fabricated using RT/duroid 5880 substrate with thickness of 0.38 mm. The dimension of the power divider is 13 mm × 6.5 mm. The proposed power divider has typical power division of-3 dB and insertion loss less than-1 dB, better than-13 dB of isolation, less than-10 dB return loss and phase imbalances less than 2° from 1.5 to 3 GHz. Both simulation and measurement results show a good agreement.