Circuit Agility

Lourandakis, Errikos; Weigel, Robert; Mextorf, Henning; Knoechel, R.

doi:10.1109/mmm.2011.2173987

Cited by 36 publications

(16 citation statements)

References 28 publications

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“…It can be seen that |S 15 Fig. 4(b) are almost the same as in state A with the output ports being the pair (3, 4) instead of (1,2). Good matching is also achieved in state B with the plot of its |S 55 | being identical to that shown in Fig.…”

Section: Switchable 2-way Power Divider Designmentioning

confidence: 58%

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Five Ports Power Divider Designs With Controllable Power Division and Switching Capabilities

Al-Zayed¹,

Al-Yousef²,

Mahmoud³

2016

PIER

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Abstract-Two new 5-port power divider designs capable of controlling the power division ratios between the output ports are proposed. In the first design, the input power is switchable between two pairs of the output ports. This is implemented by terminating the dividers' two open-ended stubs with varactor diodes. In the second design, the power division is controlled by a single varactor diode that terminates one of the dividers two open-ended stubs. With judicious choice of dc bias voltage, it is possible to realize equal as well as unequal power division ratios between the four output ports. High power division ratios was achieved without the necessity of involving transmission lines with high impedances. It is demonstrated that this design is capable of generating amplitude modulated signals. Simulation and measurement results are presented for the designs to show their power division and matching performance.

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Section: Switchable 2-way Power Divider Designmentioning

confidence: 58%

“…Frequency agility and power division controllability are examples of features required in some modern power divider designs [1]. To control the power division ratio, a reconfigurable mechanism should be introduced to the power divider design.…”

Section: Introductionmentioning

confidence: 99%

Five Ports Power Divider Designs With Controllable Power Division and Switching Capabilities

Al-Zayed¹,

Al-Yousef²,

Mahmoud³

2016

PIER

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“…Fig 2.3(a) shows a design of a tunable power divider with 2:1 power division based on a ring structure [57]. Fig 2.4(b) shows another frequency agile power divider which covers frequency range of 1.7 GHz to 2.4 GHz [62]. However, the tunability of both designs is quite limited.…”

Section:  Other Techniquesmentioning

confidence: 99%

“…Fig 2.5 (a) shows a typical design of a frequency-agile tunable coupler that has achieved a tunability range of 27% [62]. By loading varactor diodes on a branch-line structure, the narrow operating band of a 3-dB coupler can be shifted [63]- [65].…”

Section:  Other Techniquesmentioning

confidence: 99%

“…In many cases, such as measurement systems or antenna array feeding networks, the tunable coupling coefficient is much more favourable. Fig 2.4(b) shows a tunable coupler with tuning coupling ratios devised by cascading two directional couplers and shunting two grounded variable capacitors [62]. In [69], a lumpedelement-based directional coupler was integrated onto an MMIC to get electronic control over the coupling coefficient from 1.4 to 7.1 dB.…”

Section:  Other Techniquesmentioning

confidence: 99%

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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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Advances in Power Splitters

Xue

Zhang

2014

Wiley Encyclopedia of Electrical and Electronics Engineering

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This article summarizes recent advances in the art of power splitter designs. Diverse design concepts and techniques proposed in recent years are introduced, mainly focusing on the out‐of‐phase power splitters, in‐phase power splitters, filtering power splitters, and high‐power waveguide power splitters. Because of the popularity of balanced circuits, out‐of‐phase power splitters are heavily demanded. The double‐sided parallel‐strip lines (DSPSLs), with the frequency‐independent out‐of‐phase characteristics, are attractive transmission lines for wideband out‐of‐phase power splitter designs. The design methods based on DSPSL for various power splitting responses have been presented, including single‐ and dual‐band, wideband, arbitrary power division ratios. Then, the research on in‐phase power splitters are addressed, focusing on dual‐band operation, arbitrary power division ratios, multiway division, reconfigurable responses, and size miniaturization. The four typical methods for achieving dual‐band operation and five methods for realizing unequal power division ratios are presented. In addition, some techniques for multiway power splitters and reconfigurable power dividers are introduced. As for size reduction techniques, the LTCC and MMIC fabrication processes are introduced and example designs are included. Later, the concept of filtering power splitters is introduced. The power splitters and bandpass filters are combined together to form dual‐function devices with both power splitting and filtering functions. The responses of equal and unequal power division ratios as well as dual‐band operation are presented with the associated design techniques. Finally, coaxial waveguide power splitters are introduced, which are suitable for high‐power millimeter‐wave applications. Various oversized coaxial waveguide structures and probe array arrangement are presented for multioutput applications. Furthermore, some advances on radial waveguide spatial power splitters are addressed and the typical examples are included.

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Circuit Agility

Cited by 36 publications

References 28 publications

Five Ports Power Divider Designs With Controllable Power Division and Switching Capabilities

Five Ports Power Divider Designs With Controllable Power Division and Switching Capabilities

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

Advances in Power Splitters

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