FREE IEEE PAPER An Etched Ground GCPW 7:1 Unequal Wilkinson Power Divider

Conclusion and Result of An Etched Ground GCPW 7:1 Unequal Wilkinson Power Divider

The circuits were assembled with SMA end launchers and measured on an Agilent E5071C ENA from 2 – 8 GHz using a short open load through (SOLT) calibration. the simulated and measured results of the power divider, respectively. For the simulated design, the high and low impedance insertion loss values are -8.7 dB and -0.89 dB, respectively. It is believed that the 6 GHz resonance observed in  impacts the high impedance insertion loss resulting in a deviation from the ideal value of -9.03 dB. This resonance is due to the asymmetry of the high impedance line. The input return loss is better than -30 dB at 5 GHz while the isolation between high and low impedance sections is approximately -20 dB at 5 GHz.

The measured results show a high and low impedance insertion loss of -9.3 dB and -0.87 dB at 5 GHz. The input return loss is -25 dB and the isolation is better than that at 5 GHz. The measured 3 dB bandwidth defined by the input return loss is calculated to be 10.6 %. The circuits were measured in a round robin fashion by placing a 50 ? load on the port that was not connected to the network analyzer. While making isolation measurements, additional cables were required due to the close proximity of the connectors on the substrate.

As a result a slight ringing noise in the isolation data can be observed. Phase difference comparisons between ports 2 and 3 are shown in. The non-zero phase difference in both results is due to the natural asymmetry of this particular design. Additional efforts could be made to minimize the phase difference such as adding electrical length to the low mpedance side of the power divider.

the insertion loss values and calculated power division ratio for the ideal and the measured “etched ground” GCPW Wilkinson power dividers. Excellent results are achieved with approximately 0.25 dB of connector insertion loss observed in the data at 5 GHz. The calculated power division ratio for the actual structure is 6.93.

A 7:1 unequal Wilkinson power divider has been fabricated in 0.508 mm-thick Rogers RT/Duroid 5880. The measured results indicate a 6.9 power division ratio with isolation and input return loss greater than -20 dB at 5 GHz. A simple etching of the backside ground was used to realize the high impedance sections to achieve this high power division ratio. To the authors’ knowledge, this is the highest unequal Wilkinson power divider published.

Furthermore, by integrating the novel “etched ground” GCPW with the traditional GCPW, impedance values ranging from 30 5 to 230 5 can be realized on the same substrate. This technology has many applications in  planar circuits as demonstrated by the unequal Wilkinson power divider and can be extended to double-sided microwave integrated circuit technology (MIC) in a straight forward manner.

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FREE IEEE PAPER A Novel 1-D Periodic Defected Ground Structure for Planar Circuits

SOME TEXT FROM PAPER A Novel 1-D Periodic Defected Ground Structure for
Planar Circuits

a measurement and results

The proposed DGS circuit, which is composed of the five-etched lattices. In this letter, we try to compare the measurement results with those of the circular lattice  cases, which are described in. Three DGS circuits for measurements have been fabricated using TACONIC CER-10 with 62-mil thick (1.5748 mm) and dielectric constant of 10. The period was kept constant to 5 mm for all three circuits. The etched rectangular area was varied with keeping the square shape. In order to compare the stopband effect of the proposed DGS circuit with previous results, the etched square area was chosen by corresponding to etched circle areas described in.

A line width of 1.46 mm was used, corresponding to 50- line for conventional microstrip line. For smaller square area the cutoff frequency is very high. As the etched area is increased the cutoff frequency becomes lower. Based on previous research, the measured results with constant number of periods show that depth and bandwidth of the stopband depend on the circle radius. In general, the stopband center frequency is a function of the period of the structure. However, the measurements on the proposed DGS circuit show that cutoff frequency and stopband characteristic depend on the etched square dimensions. The period of the proposed DGS defect affects slightly on the stopband center frequency compared with its dimension. The depth and bandwidth of the stopband for the proposed DGS circuit are inclined to depend on the number of period. The etched square area, which determines the effective inductance, characterizes the cutoff and stopband frequency characteristics of the newly proposed DGS structure. The center frequency of stopband for the proposed DGS structure is determined by the resonance frequency of each etched lattice cell. Thus, the cutoff and stopband characteristics for the proposed DGS structure can be easily estimated. Radiation loss could be occurred in some frequency range due to the etched defected area in ground plane. However, addition of the reflected and  transmitted power in the first propagation frequency band shows very low radiation level from the ground plane compared with a reported PBG circuits.

a conclusion, 

We proposed the novel etched lattice shape for the one-dimensional (1-D) DGS structure. The proposed DGS structure provides the cutoff frequency characteristic due to the effective inductance of the unit lattice, which is etched on microstrip ground plane. The proposed DGS structure is easier to control the cutoff and stopband characteristics by changing the dimensions and to fabricate. And it is much easier than circular periodic cases to analyze proposed periodic structure with finite- difference time-domain (FDTD). It is possible for the newly proposed PBG structure to apply to coplanar waveguide (CPW) and strip line for MMIC applications.

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FREE IEEE PAPER One approach to the development of custom SNMP agents and integration with management systems

SOME TEXT FROM PAPER One approach to the development of custom SNMP agents and integration with management systems

The proposed SNMP agent is designed using OpenDMK Java libraries. The Project OpenDMK source code is based on the Java Dynamic Management Kit version 5.1 (Java DMK), with the exception of some legacy or deprecated APIs which were removed. OpenDMK provides the necessary tools for integration of Java technology with SNMP Internet network management standard. OpenDMK compatibility with SNMP-based management model enables the development of an agent using the Java programming language, which can be accessed via SNMP protocol [5]. Our SNMP agent developed using this toolkit is completely independent of the SNMP management application installed in the manger station, which allows integration of the developed agent with different management systems. The developed agent is a process that is executed on a managed device that realizes the communication with the managing entity for the purpose of realization management operations. This communication will be later verified by integration of the SNMP agent with two monitoring entities (applications) - Zenoss and Cacti.

In order to test the implemented SNMP agent we performed integration with two network management systems: Zenoss and Cacti. Zenoss is a powerful open source IT monitoring product, while Cacti is an open source, web-based graphing tool designed as a frontend to RRDtool's data storage and graphing functionality.

Since Cacti is only graphing tool, it does not support receiving SNMP trap messages, however it is possible to monitor managed entities using SNMP polling. In order to integrate custom agent with Cacti, it is necessary to define Extensible Markup Language (XML) file that represents a description of MIB table structure. Fig.8 represents XML file that describes MIB table structure for implemented agent.

Because Cacti management system has no support for the acceptance of SNMP Trap it does not provide the ability to fully test the functionality of our implemented agent. Therefore, the SNMP agent has been integrated with another management system, Zenoss. Zenoss provides complete testing of the installed agent, through retrieving/setting the values of managed objects in the MIB and the acceptance of Trap messages. To perform the integration of our agent and management system Zenoss, it is necessary that the MIB, we have designed, is added into the base of non-standard MIB's used by Zenoss, and define the device we want to monitor

The aim of this paper - to explore the possibility of custom agents development and their integration within standard network management systems - has been achieved in the following way. According to the given approach an implementation of one simple SNMP agent using OpenDMK libraries is performed. As is shown in previous chapter, the integration is performed with several network management systems (e.g. Cacti, Zenoss) and tests have confirmed the success of integration. We see future work in researching the possibility of Service Oriented Architecture (SOA) based agents development and their integration within current network management systems.

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FREE IEEE PAPER Web-based Automatic Network Discovery/Map Systems

SOME TEXT FROM PAPER Web-based Automatic Network Discovery/Map

The first scenario shows two maps from WANMS. In these figures, our system can display detailed networking devices, especially including the wireless access point properly.

FREE IEEE Paper : A 10:1 Unequal Wilkinson Power Divider Using Coupled Lines With Two Shorts

Some Description of  FREE Download IEEE Paper, A 10:1 Unequal Wilkinson Power Divider Using Coupled Lines With Two Shorts

An alternative way to realize an unequal power divider with large dividing ratio can be through using a simple directional coupler. In order to obtain zero phase difference at the output ports, a phase shifter is needed to add to the coupler. This can be realized by using either a piece of transmission line or an integrated wideband phase shifter. The circuit will then either be narrowband in phase response due to presence of the extra transmission line, or become complicated when using the integrated wideband phase shifter. On the other hand, the structure of the directional coupler is more sensitive to the fabrication tolerance, since its dividing ratio is directly determined by coupling
coefficient. In our proposed power divider, however, the coupling coefficient of the coupled line only slightly affects the bandwidth, therefore leading to an easy fabrication.


To avoid the fabrication difficulties, the high characteristic impedance line is realized by using a coupledline section with two shorts. A design example at 2 GHz is fabricated and tested. The measurements agree very well with the simulations. The measured bandwidth of is about 16%. Over this operation bandwidth, the isolation is better than . The measured amplitude balance betweenoutput port 2 and port 3 is between and , and the phase difference is between 0 and 4.6 . The proposed
structure is compatible with single layer integration and easy to design, therefore very attractive for high power dividing ratio applications.

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FREE IEEE PAPERS : TOP 100 JANUARY 2015

GET FREE ACCESS DOCUMENT FOR FREE IEEE PAPERS : TOP 100 JANUARY 2015

HOW TO DOWNLOAD : click on the title you want, when there is no paper that can be downloaded, please directly contact us through this page.

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3. Cellulararchitecture and key technologies for 5G wireless communication networks
4. Securitythreats in cloud computing
5. Software-DefinedNetworking: A Comprehensive Survey
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7. An Overview of Massive MIMO: Benefits and Challenges
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9. Scenarios for 5G mobile and wireless communications: the vision of the METIS project
10. 5G technology of mobile communication: A survey
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12. Defining architecture components of the Big Data Ecosystem
13. A Computational Approach to Edge Detection
14. Five disruptive technology directions for 5G
15. A Survey of Software-Defined Networking: Past, Present, and Future of Programmable Networks
16. Research Directions for the Internet of Things
17. Histograms of oriented gradients for human detection
18. A Frequency and Polarization Reconfigurable Circularly Polarized Antenna Using Active EBG Structure for Satellite Navigation
19. A tutorial on hidden Markov models and selected applications in speech recognition
20. Direct mobile-to-mobile communication: Paradigm for 5G
21. Power-Electronic Systems for the Grid Integration of Renewable Energy Sources: A Survey
22. Statistical pattern recognition: a review
23. Image quality assessment: from error visibility to structural similarity
24. Robust Face Recognition via Sparse Representation
25. Wearable Sensors for Human Activity Monitoring: A Review
26. An Introduction To Compressive Sampling
27. Context Aware Computing for The Internet of Things: A Survey
28. A fast and elitist multiobjective genetic algorithm: NSGA-II
29. Multilevel inverters: a survey of topologies, controls, and applications
30. Image Quality Assessment for Fake Biometric Detection: Application to Iris, Fingerprint, and Face Recognition
31. Image Super-Resolution Via Sparse Representation
32. Toward efficient and privacy-preserving computing in big data era
33. Design considerations for a 5G network architecture
34. Modeling and Optimization for Big Data Analytics: (Statistical) learning tools for our era of data deluge
35. Spatial Modulation for Generalized MIMO: Challenges, Opportunities, and Implementation
36. Challenges in 5G: how to empower SON with big data for enabling 5G
37. A survey on sensor networks
38. Representation Learning: A Review and New Perspectives
39. A Fully Synthesizable All-Digital PLL With Interpolative Phase Coupled Oscillator, Current-Output DAC, and Fine-Resolution Digital Varactor Using Gated Edge Injection Technique
40. Overview of Control and Grid Synchronization for Distributed Power Generation Systems
41. Dual Polarization Slotted Miniature Wideband Patch Antenna
42. The path of the smart grid
43. A 0.13 µm CMOS System-on-Chip for a 512 × 424 Time-of-Flight Image Sensor With Multi-Frequency Photo-Demodulation up to 130 MHz and 2 GS/s ADC
44. Toward Energy Efficient Big Data Gathering in Densely Distributed Sensor Networks
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46. Smart Grid Technologies: Communication Technologies and Standards
47. Challenges of System-Level Simulations and Performance Evaluation for 5G Wireless Networks
48. Internet of Things in Industries: A Survey
49. A Real-Time QRS Detection Algorithm
50. Robust uncertainty principles: exact signal reconstruction from highly incomplete frequency information
51. Big Data and the SP Theory of Intelligence
52. Particle swarm optimization
53. Cognitive radio: brain-empowered wireless communications
54. Optical Vehicle-to-Vehicle Communication System Using LED Transmitter and Camera Receiver
55. A Survey on Software-Defined Network and OpenFlow: From Concept to Implementation
56. Super-resolution image reconstruction: a technical overview
57. 5G wireless backhaul networks: challenges and research advances
58. Modulation Formats and Waveforms for 5G Networks: Who Will Be the Heir of OFDM?: An overview of alternative modulation schemes for improved spectral efficiency
59. Big data: Issues, challenges, tools and Good practices
60. Future on Power Electronics for Wind Turbine Systems
61. Permission Use Analysis for Vetting Undesirable Behaviors in Android Apps
62. Noncooperative Cellular Wireless with Unlimited Numbers of Base Station Antennas
63. Smart Grid — The New and Improved Power Grid: A Survey
64. Leakage current mechanisms and leakage reduction techniques in deep-submicrometer CMOS circuits
65. 5G wireless access: requirements and realization
66. Evolution toward 5G multi-tier cellular wireless networks: An interference management perspective
67. Captcha as Graphical Passwords—A New Security Primitive Based on Hard AI Problems
68. A Survey on Device-to-Device Communication in Cellular Networks
69. Big data: A review
70. Device-to-device communication in 5G cellular networks: challenges, solutions, and future directions
71. Rapid object detection using a boosted cascade of simple features
72. Online Social Networks: Threats and Solutions
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77. An Overlay-Based Data Mining Architecture Tolerant to Physical Network Disruptions
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82. Weighted Guided Image Filtering
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84. Analysis and Design of a Low-Voltage Low-Power Double-Tail Comparator
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92. Smart home energy management system including renewable energy based on ZigBee and PLC
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