Tri-Mode Heterogeneous Integrated Beam-Switching/Van Atta/Phase-Conjugating Array Using Synthesized Transmission Lines

Lai, Chi-Hui; Shiau, Chen-Yuan; Ma, Tzyh‐Ghuang

doi:10.1109/tmtt.2014.2340813

Cited by 24 publications

(4 citation statements)

References 26 publications

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“…This monostatic radar technique with interferometry as shown in Fig. 2.16 (a) Antenna array prototype with feeding network [87] and (b) phased array network [88] In the case of phased array which plays a crucial role in modern wireless communication system requires feeding network in order to develop beam forming [87] or beam switching [88] network. In order to develop the network, several microwave devices are required along with the feeding network such as quadrature hybrids, phase shifters, crossover etc.…”

Section: Existing Microwave Based System Using Microwave Devicesmentioning

confidence: 99%

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Planar microwave devices for wideband microwave medical diagnostic and therapeutic systems

Ahmed¹

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Microwave systems for medical diagnosis and treatment have been of increasing interest in both academia and industry over the past few years. Among numerous biomedical applications, breast cancer, brain stroke and heart failure detection have been attracting significant interests. Microwave detection and treatment systems, which are compact, lowcost, and efficient, have great potential to become a complementary detection and diagnosis modality for biomedical applications. Moreover, microstrip antenna arrays are often used in modern telecommunication and radar systems which require a complicated feeding network consisting of several microwave devices such as power divider, phase shifter, etc. These outstanding merits ignite increasing investment and research into the design and building efficient microwave systems, which are composed of several main parts, namely the antenna array, microwave transceiver, and signal processing algorithms.This thesis investigates the key passive microwave devices, such as in-phase and out-ofphase power dividers, multiport feeding network, and leakage cancellation circuit, needed to build microwave systems. According to the particularity of the circumstances and the complexity of the system, many challenges in designing the devices as well as a sub-system are analyzed. For an efficient and reliable microwave based system, these devices have been designed to provide the required performance concerning the bandwidth, return loss, insertion loss, isolation etc. using compact and low-cost planar structures. This thesis develops five series of methodologies to tackle these challenges; several sub-systems based on these methodologies are successfully implemented in the laboratory environment.The contribution in the first series is designing a variety of power dividers that operate as the feeding network of the microwave system. To obtain a wideband operation, two approaches are investigated. For the first one, the single layer microstrip-slot technology is employed to obtain the successful development of the components. This technique is applied to the inphase and out of phase power divider. The simulated and measured results of the microstripslot components show the wideband performances across 1-8 GHz. The contribution in the second series is to design power dividers with high power handling capability. Both in-phase and out phase power dividers is designed using parallel coupled microstrip lines in order to obtain wideband performance. In this case, several power dividers from medium to high power handling capability are designed from 1-3 GHz. Detailed design procedures and V

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Section: Existing Microwave Based System Using Microwave Devicesmentioning

confidence: 99%

“…shown that the Wilkinson design can be modified to achieve fractional bandwidths of 109-140% with 13-15 dB of isolation [88], 40% with 20 dB of isolation [40,89], or 72% with 10 dB of isolation [93].…”

Section: Introductionmentioning

confidence: 99%

Planar microwave devices for wideband microwave medical diagnostic and therapeutic systems

Ahmed¹

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“…Power dividers play an important role in a variety of microwave circuits, feeding networks for antenna arrays, radar systems and other related fields [1]. Moreover, wideband in-phase power divider is highly demanded in high power applications such as microwave based brain hyperthermia system in order to build the antenna beamforming network [2].…”

Section: Introductionmentioning

confidence: 99%

In-phase power divider using three parallel coupled lines for medium power applications

Ahmed

Abbosh

2016

2016 International Conference on Electromagnetics in Advanced Applications (ICEAA)

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The design of a compact high power in-phase power divider with planar structure is presented. The proposed device utilizes a stepped impedance T-junction of microstrip line and a pair of three parallel coupled microstrip lines. To realize the required tight coupling for wideband performance, each of the side coupled lines are shorted to the ground. Moreover, one resistor is connected between the two-pair of three-line coupled structure to improve isolation property between the output ports of the device. Both the equivalent circuit and simulation results indicate that the proposed device operates from 1 GHz to 3 GHz with more than 15 dB isolation, 10 dB return loss and less than 0.5 dB of additional insertion loss.

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“…However, a significant drop of total gain during the steering process remains a big issue. Fig 2.6 shows a design example of a beam-forming network design which is able to switch the beam to certain directions [101]. This idea is quite novel, but the design is unable to tune the beam in a continuous manner.…”

Section: Designmentioning

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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Tri-Mode Heterogeneous Integrated Beam-Switching/Van Atta/Phase-Conjugating Array Using Synthesized Transmission Lines

Cited by 24 publications

References 26 publications

Planar microwave devices for wideband microwave medical diagnostic and therapeutic systems

Planar microwave devices for wideband microwave medical diagnostic and therapeutic systems

In-phase power divider using three parallel coupled lines for medium power applications

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

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