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Author: Donald C. Benson Publisher: ISBN: Category : Microwave filters Languages : en Pages : 139
Book Description
A novel technique for effecting phase shift of X-band signals has been developed and analyzed for use with quadrature amplitude modulation (QAM) of signals in a phased array application, and the impact of this phase shifter on error vector magnitude (EVM) has been quantified. A commercially available filter consisting of yttrium iron garnet (YIG) spheres was characterized by means of a network analyzer. The gain and phase response was measured across a 25 MHz frequency band centered at 10 GHz, while the filter was tuned in frequency steps such that a 360° range of phase shifts was achieved. The S-parameters from these measurements were integrated with Matlab representations of QAM-16 modulation, demodulation, and phased array antennas to model a complete radio system. The EVM caused by non-ideal gain and phase response of the YIG filter was determined for various beam angles and data patterns. It was found that a YIG filter does provide stable phase shift suitable for phased array applications, with acceptable attenuation so long as the frequency being transmitted remains within the filter's pass band. The particular filter analyzed did not contain sufficient stages to maintain 3 dB flatness across the required 360° tuning range, but performed satisfactorily for a limited range of beam orientation. The capability to provide continuously variable phase shift offered by the YIG filter was found to not offer significant advantage over the discrete steps produced by switched delay lines.
Author: Donald C. Benson Publisher: ISBN: Category : Microwave filters Languages : en Pages : 139
Book Description
A novel technique for effecting phase shift of X-band signals has been developed and analyzed for use with quadrature amplitude modulation (QAM) of signals in a phased array application, and the impact of this phase shifter on error vector magnitude (EVM) has been quantified. A commercially available filter consisting of yttrium iron garnet (YIG) spheres was characterized by means of a network analyzer. The gain and phase response was measured across a 25 MHz frequency band centered at 10 GHz, while the filter was tuned in frequency steps such that a 360° range of phase shifts was achieved. The S-parameters from these measurements were integrated with Matlab representations of QAM-16 modulation, demodulation, and phased array antennas to model a complete radio system. The EVM caused by non-ideal gain and phase response of the YIG filter was determined for various beam angles and data patterns. It was found that a YIG filter does provide stable phase shift suitable for phased array applications, with acceptable attenuation so long as the frequency being transmitted remains within the filter's pass band. The particular filter analyzed did not contain sufficient stages to maintain 3 dB flatness across the required 360° tuning range, but performed satisfactorily for a limited range of beam orientation. The capability to provide continuously variable phase shift offered by the YIG filter was found to not offer significant advantage over the discrete steps produced by switched delay lines.
Author: Binboga Siddik Yarman Publisher: CRC Press ISBN: 1000794253 Category : Medical Languages : en Pages : 653
Book Description
This book aims to cover a new emerging need in designing digital phase shifter for modern communication systems. With the advancement of new generation mobile communication systems, directed beams of antenna arrays save a substantial amount of power as well as improve the communication quality. In this regard, beam-forming circuits, such as digital phase shifters (DPS) constitute essential parts of the antenna array systems. Therefore, this book is devoted to the design of digital phase shifters for various communications systems. Nowadays, phase array systems demand compact phase shifters suitable for chip implementation with wide phase-range and broad frequency band. Each chapter of this book is organized as stand-alone in such a way that the reader requires no specific background acquired from the other chapters. For each phase shifter topology introduced in this book, the reader is furnished with explicit design equations to construct the circuit under consideration. Furthermore, design equations are programmed using MATLAB to assess the electrical performance of the phase shifters with ideal and lossy components. MATLAB design programs are given at the and of each chapter as appendices and provided as soft copy on the web page of the book. In chapters 12 and 14, MMIC layouts for the lattice and T-section based DPS are provided for the readers. It is hoped that an interested reader can immediately identifies the “optimum phase shifter topology” for the need under consideration with its estimated electric performance.
Author: Prasanna V. Seshadri Publisher: ISBN: Category : Languages : en Pages : 87
Book Description
With MIMO (Multi-Input Multi-Output) based communication technologies advancing since thebeginning of this decade like WiMax and LTE, phased arrays using multi antennas, have becomea hot topic of research. Such phased arrays are composed of phase shifters which enable thebeam to be steered in the direction of maximum energy. This thesis focuses on the design of sucha phase shifter to work in the X band frequencies of the electromagnetic spectrum. The main useof X band has been in the field of Radar, terrestrial communications as well as forcommunications in space. An Analog phase shifter, based upon I/Q Vector Modulation is first designed using idealcomponents in Agilent ADS. The ideal components which provide a perfect response for thephase shifter are replaced using practical components which affect the output of the phaseshifter. The final design gives an insertion loss in the order of 8 dB and also an error in phasethat is around +/-5 degrees. A possible application for the phase shifter that is designed namely in a receiver with phasedarray antennas is also discussed. This super-heterodyne receiver as a complete system can beintegrated together with the phased array and using a suitable algorithm can focus the main lobeof the phased array antenna in the direction that is desired. Once the system is integrated, it canbe put to practical usage.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
A key element in a GaAs MMIC Transmit/Receive module for active Phased-array application is the phase-shifter needed for the electronic beam steering; because of the circuit complexity and usually large chip size the technological and electrical yield must be maximized. In the present work the design, realisation and performance of an X-band, four-bit phase shifter, using a high-yield technology and a tolerant electric circuit are described.
Author: Sunghwan Kim Publisher: ISBN: 9781109717693 Category : Languages : en Pages : 218
Book Description
One of the challenges in implementing phased array systems is to implement high performance phase shifters. This dissertation presents highly linear phase shifters for 2GHz wireless mobile applications and millimeter-wave phased array transmitters with active phase shifters. Different architectures of phased array systems pursue different aspects of phase shifters. In the first part of the dissertation, a low-loss, low-distortion passive variable phase shifter on Silicon-on-Glass (SOG) process will be presented. Schottky diodes in the SOG process enables very high quality factor of varactor diodes and on-chip passive inductors. A novel passive variable phase shifter with varactors and inductors presented in the dissertation has very low third-order intermodulation distortion (IMD3) and low insertion loss, which make it suitable for transmitter front-end applications in mobile devices working at CDMA bands. In the second part, two generations of integrated phased array upconverters at millimeter-wave frequencies with LO-path phase shifting will be presented. The phase-shifting is achieved by the vector summation of the I/Q LO signals in the LO path. The first version adopts a frequency doubler followed by a polyphase filter to generate the I/Q basis LO signals. The principal of the active phase shifter operation and frequency doubler are explained. The phase error due to amplitude and phase mismatch of the polyphase filter is discussed. The eight-element phased-array transmitter is implemented in a 0.18[mu] SiGe BiCMOS process in the later version. To reduce dc power consumption, a localized frequency doubling injection-locked quadrature oscillator is used to ease LO signal distribution. Measured conversion gain over frequency and IF signal is presented. Array beam scanning pattern is also presented based on the measured phase and power for each channel.
Author: M. Simpson Publisher: ISBN: Category : Languages : en Pages : 39
Book Description
Efforts were continued on a program to develop waveguide reciprocal latching ferrite phase shifters for the X-band and C-band frequency ranges. The phase shifters are to operate in a digital manner and will contain four bits, namely 180, 90, 45 and 22.5 degrees. Another objective of this program is the design of a highly efficient and stable electronic driver circuit. This circuit is to provide switching of all four bits with an overall efficiency of at least 70%. The phase shifters are to be capable of use in phased array antenna systems. Experimental data of reciprocal phase shift, transmission loss, and impedance match produced by a single bit dielectric loaded double window ferrite toroid situated in the H-plane of ridge and rectangular waveguides at X-band frequencies are presented. Reciprocal phase shift of approximately 90 degrees per inch with transmission loss of about 1.0 db and a variation of phase shift of + or - 15 degrees over the frequency range of 9.0 to 9.7 Gc, has been obtained from the ridge waveguide phase shifter configuration. Experimental data of somewhat lower quality has been produced by the rectangular waveguide phase shifter configuration. (Author).
Author: Dean Banerjee Publisher: Dog Ear Publishing ISBN: 1598581341 Category : Frequency modulation detectors Languages : en Pages : 346
Book Description
This book is intended for the reader who wishes to gain a solid understanding of Phase Locked Loop architectures and their applications. It provides a unique balance between both theoretical perspectives and practical design trade-offs. Engineers faced with real world design problems will find this book to be a valuable reference providing example implementations, the underlying equations that describe synthesizer behavior, and measured results that will improve confidence that the equations are a reliable predictor of system behavior. New material in the Fourth Edition includes partially integrated loop filter implementations, voltage controlled oscillators, and modulation using the PLL.
Author: Donald C. Benson
Author: Donald C. Benson
Author: Binboga Siddik Yarman
Author: Prasanna V. Seshadri
Author: 
Author: 
Author: Sunghwan Kim
Author: M. Simpson
Author: 
Author: 
Author: Dean Banerjee