Design of Dual-Band Coupler With Arbitrary Power Division Ratios and Phase Differences

Chi, Pei‐Ling; Ho, Kuan Lin

doi:10.1109/tmtt.2014.2364218

Cited by 38 publications

(26 citation statements)

References 30 publications

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“…In addition, equal division ratio WPD can be easily analyzed using "Even-Odd Mode" Analysis Method for three ports network by Cohn [2]. To overcome the narrowband problem of WPD, other structures are proposed for multi-band operation [3][4][5]. On the other hand, when designing an UWB WPD, three main criteria must be taken into consideration: isolation enhancement, matching improvement and bandwidth broadening.…”

Section: Introductionmentioning

confidence: 99%

Two-Way Modified Wilkinson Power Divider for Uwb Applications Using Two Sections of Unequal Electrical Lengths

Osman¹,

El-Tager²,

Abdelghany³

et al. 2016

PIER C

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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.

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Section: Introductionmentioning

confidence: 99%

Two-Way Modified Wilkinson Power Divider for Uwb Applications Using Two Sections of Unequal Electrical Lengths

Osman¹,

El-Tager²,

Abdelghany³

et al. 2016

PIER C

View full text Add to dashboard Cite

show abstract

“…Note that the insertion losses are relatively large and the bandwidth is extremely narrow, which limit its practical applications. In 2014, three different kinds of modified couplers were proposed in . The first one was suitable for high‐frequency (13.56 MHz) applications.…”

Section: Introductionmentioning

confidence: 99%

“…The second one focused on wideband operations. The third one has dual‐band operations with chosen power division ratios and phase differences. It is obvious that all of these three couplers in do not integrate filtering function and the corresponding design processes are still complicated.…”

Section: Introductionmentioning

confidence: 99%

Wideband filter-integrated coupled-line coupler with unequal power division and inherent DC-block function

Jiao

et al. 2015

Microw. Opt. Technol. Lett.

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This letter reports a novel single‐layer planar coupled‐line coupler with multiple prominent advantages. These advantages include compact size, wideband filter‐integrated coupling and transmission, unequal power division, flat phase difference, and inherent DC‐block function between two arbitrary ports. Eventually, a microstrip prototype with 7.1‐dB power‐division ratio is implemented for verification, whose fractional bandwidth of 20‐dB return loss is 58.4%. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:121–123, 2016

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“…With the transformation from S-parameters to ABCD-matrix and equations above, one can obtain the following relations regarded the electrical lengths and characteristic impedances [154]:…”

Section: Resultsmentioning

confidence: 99%

“…Following the discussion in [154], when the desired differential phase is given, one can find the required values and . In other words, the required shifting phase of two units can be found from the following formulas:…”

Section: Tunable Differential Phasementioning

confidence: 99%

Multi-functional and Tunable Microwave Devices and Sub-systems for Wideband Applications

Zhu¹

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Microwave components and sub-systems have been widely investigated in recent years since they play essential roles in microwave systems. With the rapid development and explosive extension of microwave techniques, high speed, large data volume, and electromagnetic compatibility are not the only issues that concern designers, practitioners, and researchers. Features like multi-functionality, reconfigurability, portability, low energy consumption, miniaturization of circuit size and simple construction have come into focus more and more in recent years. Currently, microwave devices are suffering from several drawbacks: huge losses from a lack of integration of individual components, lack of new functionality, poor adaptability to different environments, low efficiency, flexibility and controllability, high cost and energy consumption, and insufficient miniaturization of circuit size.With these existing challenges and the huge call for innovation in microwave components and subsystems, new design approaches and structures are extremely in demand and a high point of focus.This thesis aims to solve some of the current challenges mentioned above by making four main contributions.The first contribution is the development of new design approaches to design microwave devices with multiple functions to replace cascaded devices with a single function. The main target is to reduce the overall number of components used in constructing microwave systems. With a large number of cascaded devices, huge losses will be produced which decrease systems" reliability and overall performance, not to mention the current large circuit volumes, high cost, and energy consumption. Multi-functional componentry is a suitable and proper solution to solve these problems. In wireless microwave systems, power dividers are usually cascaded with bandpass filters, to get rid of unwanted signals and transmit the desired ones. When the number of output terminations is raised, more filters are required, which makes it more difficult for design and implementation. A four-way power divider integrated with filtering characteristics is proposed to replace the cascaded structures. The proposed design shows equal power division, great selection of filtering signals and reduction in device numbers and overall cost.The second contribution is the development of multiple tunable microwave devices which can be controlled and adapted to different environments. An electrical tuning method is used by loading varactors on microstrip lines. To begin with, tunable bandpass filters were investigated to achieve high tunability of both centre frequency and bandwidth. To that end, several new designs with varactor-loaded coupled-line sections were proposed and verified. Relocatable transmission zero was realised to control the cut-off of the passband at two edges. The concept was applied in the II design of a tunable balanced bandpass filter with a wide tuning range and high common-mode suppression. Wideband power dividers with tunable power division at output termi...

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Design of Dual-Band Coupler With Arbitrary Power Division Ratios and Phase Differences

Cited by 38 publications

References 30 publications

Two-Way Modified Wilkinson Power Divider for Uwb Applications Using Two Sections of Unequal Electrical Lengths

Two-Way Modified Wilkinson Power Divider for Uwb Applications Using Two Sections of Unequal Electrical Lengths

Wideband filter-integrated coupled-line coupler with unequal power division and inherent DC-block function

Multi-functional and Tunable Microwave Devices and Sub-systems for Wideband Applications

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