14 research outputs found
Tools for Large Graph Mining
No full textby a gift from Northrop-Grumman Corporation. The views and conclusions contained in this document are those of the author and should not be interpreted as representing the official policies, either expressed or implied, of any sponsoring institution, the U.S. government or any other entity
Flexible ultra‐high transformation ratio‐based dual‐band impedance transformer and its applications in a T‐junction power divider
No full textAbstract A design scheme is presented for an all‐pass coupled‐line (APCL)‐based dual‐band impedance‐matching network. Salient features include a highly flexible frequency ratio (r) (high of 15 and low of 1.2) and impedance transformation ratio (k) (high of 9 and low of 0.2) simultaneously at two arbitrary, uncorrelated frequencies of interest. The design strategy consists of two APCL sections and a stub that prove to be simple and easy to prototype. Detailed mathematical modelling and graphical interpretations have been presented. Closed‐form design equations have been developed and backed up with design examples. Two dual‐band T‐junction power dividers (TPDs) have been designed to demonstrate the application of the proposed impedance transformer at two widely separated frequencies. RO4350 B‐ and RO5880‐based prototypes have been fabricated for both the matching network and the TPD to validate the proposed theory. The measurement results demonstrate an achievable frequency ratio of 15 and an impedance transformation ratio of 9 in simultaneous operation mode
A novel compact tri-band matching network utilizing two dual-band transformers at a common reference frequency
No full textA Novel Design of a Tri-Band Impedance Matching Network Based on the Concept of an Impedance Bridge
No full textA Novel Design of a Bandwidth Enhanced Dual-Band Impedance Matching Network with Coupled Line Wave Slowing
No full textA Novel Concept of Virtual Impedance for High Frequency Tri-Band Impedance Matching Networks
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A novel independent harmonic tuned two‐port output network for efficiency enhanced RF power amplifiers
No full textTheory and Design of a Flexible Two-Stage Wideband Wilkinson Power Divider
No full textThis article presents the design scheme of a wideband Wilkinson Power Divider (WPD) with two-stage architecture utilizing quarter-wave transmission lines and short-circuit stubs. The bandwidth of the proposed WPD is flexible and can be controlled using the design parameters. The proposed design achieves excellent isolation between output ports in addition good in-band performance. The analysis of the proposed circuit results in a simplified transfer function which is then equated with a standard band-pass transfer function to determine the parameters of transmission lines, stub’s impedances, and the value of the isolation resistors. Furthermore, it is also demonstrated that a simple alteration in the proposed circuit enables the design of a wideband DC isolated WPD that maintains a good in-band and isolation performance. A number of case studies have been included to highlight the flexibility of the proposed design. Two distinct prototypes are developed on different boards to demonstrate the wideband performance of the proposed design. An excellent agreement between the experimental and measured results for both the designs over a wide band including very good isolation between ports validate the proposed design
Design of Compact Dual-Band Matching Network with Single Unequal Susceptance Cancellation Stub
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