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Microwave Magazine, IEEE

Issue 5 • Date August 2009

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Displaying Results 1 - 25 of 34
  • IEEE Microwave Magazine - Front cover

    Page(s): c1
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  • Table of contents

    Page(s): 3 - 4
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  • Diversity in publications [From the Editor's Desk]

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  • Mobile backhaul [From the Guest Editor's Desk]

    Page(s): 10 - 20
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  • Compound interest [President's Column]

    Page(s): 22 - 53
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  • The future of wireless charging [Microwave Surfing]

    Page(s): 30
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  • Microwave backhaul as a business: taking the next step [Microbusiness]

    Page(s): 34 - 46
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  • IEEE Transactions on Microwave Theory and Techniques - Special Issue

    Page(s): 41
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  • IEEE Applied Electromagnetics Conference - 2009

    Page(s): 43
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  • IEEE COMCAS 2009

    Page(s): 45
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  • The 2009 IEEE Compound Semiconductor IC Symposium

    Page(s): 47
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  • Screwing up [Microwave Bytes]

    Page(s): 48, 50 - 52, 135
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  • 2010 International Microwave Symposium

    Page(s): 49
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  • The next challenge for cellular networks: backhaul

    Page(s): 54 - 66
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3554 KB) |  | HTML iconHTML  

    Growth in the number of mobile users, coupled with the strong uptake of wireless broadband services, is driving high transport capacity requirements among cellular networks. However, revenues are not scaling linearly with increases in traffic. Demand for optimizing the cost efficiency of backhaul is becoming as critical as investment in the radio infrastructure. As a result, new transmission technologies, topologies, and network architectures are emerging in an attempt to ease the backhaul cost and capacity crunch. View full abstract»

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  • Is microwave backhaul up to the 4G task?

    Page(s): 67 - 74
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    With the evolution toward the fourth generation of mobile networks, the backhaul network that portion of the network infrastructure that provides interconnectivity between the base stations and the core network is expected to come under intense pressure as capacity requirements increase to support new mobile broadband services. As a key technology used in backhaul networks around the world, point-to-point microwave is rapidly evolving to support this increasing capacity demand, improve network efficiency, and allow operators to reduce network operational costs. This article details how recent developments in the microwave industry support both the lowest cost per Mb/s transport and also the maximum Mb/s/MHz. These developments embrace the dramatic shift to support Internet protocol (IP) network convergence, including the key features to enable link capacities not previously seen in the industry, and the new methods developed to enable every last drop to be squeezed out of the finite resource that is the available frequency spectrum. View full abstract»

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  • High-data-rate millimeter-wave radios

    Page(s): 75 - 83
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    This article discusses millimeter-wave Gigabit-class radio systems operating at 1-10-Gb data rates, i.e., at fiberoptic speeds. Yet, we need to talk first about fiber optics. There has been stunning progress in high-speed fiber optic technology during the past 10-15 years. Systems operate 50-100 channels per fiber and with 50-100 fibers per communications bundle. Each wavelength channel operates at 10-40 Gb/s per channel. Cost for hardware is decreasing rapidly, particularly for Ethernet optical equipment. Companies have begun transmitting radio signals over free-space optics links. There is also an industry growing around the technology of transmitting radio signals over fiber optics. As noted, the developments are absolutely stunning. View full abstract»

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  • The case for free space

    Page(s): 84 - 92
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3048 KB) |  | HTML iconHTML  

    This article discusses the prospect of free- space optical links (FSOLs) in relation to backhaul applications as well as its technology trend, including the recent development of radio on free-space optical links (RoFSOLs). Here, we consider how FSOLs act as useful transport media, focusing on practical experience in mobile backhaul networks. We refer to studies on FSOL conducted by the International Telecommunications Union (ITU) from the viewpoint of the possible exploitation of the frequency bands above 3,000 GHz, which are outside the scope of the current Radio Regulations. View full abstract»

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  • Agile microwave devices

    Page(s): 93 - 98
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    The current status of agile microwave technology is partly summarized in a book chapter and a book. The latter also gives a detailed review of applications of ferroelectrics in microwave technology and a forecast of possible future developments in the field. Several companies have started commercial development and marketing of ferroelectric varactors and devices based on them. This article highlights the advantages of ferroelectric varactors and gives a few examples of devices and system-level commercialization strategies. View full abstract»

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  • Maximizing efficiency and linearitry

    Page(s): 99 - 107
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    In, this paper, a detailed analysis of the optimum performance of various Doherty amplifier configurations in terms of output power, efficiency, and output power backoff ensuring a near-peak efficiency was presented. Closed-form design equations for the determination of the load RL and impedance Zc were derived for each configuration. An experimental realization at 1.9 GHz of a Doherty amplifier was presented. An efficiency of 43% was measured at 4 dB backoff from P1dB of 27 dBm. View full abstract»

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  • High-capacity ethernet backhaul radio systems for advanced mobile data networks [Application Notes]

    Page(s): 108 - 114
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (804 KB) |  | HTML iconHTML  

    Ethernet represents a cost-effective, high-performance metropolitan backhaul solution for next-generation mobile data networks. Wireless point-to-point realization of Ethernet network structures, such as constrained meshes and rings, represents a powerful, rapidly deployable solution for network operators. Pseudowire technology can be deployed when synchronous TDM backhaul circuits are needed at a base-station site to connect legacy (voice) backhaul demands while allowing the network to migrate toward an all-IP, Ethernet-based implementation. View full abstract»

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  • High third-order-intercept series-FET driver power amplifier [Application Notes]

    Page(s): 114 - 118
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1095 KB) |  | HTML iconHTML  

    A high TOI C-band MMIC amplifier has been developed using Cobham's multifunction self-aligned gate MESFET technology. The medium-power amplifier demonstrated 48-dBm OTOI, greater than 0.6 W saturated power, and 45% PAE performance. This outstanding TOI performance was only possible because of the SF configuration. The amplifier has approximately 3-dB higher gain than a single FET, which also results in higher PAE. View full abstract»

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  • Announcing a Joint Special Issue of the IEEE Transactions on Microwave Theory and Techniques and the IEEE/OSA Journal of Lightwave Technology on Microwave Photonics

    Page(s): 119
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  • Cancers in normal mice exposed to cell phone radiation [Health Effects]

    Page(s): 120 - 122
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    From 19 to 78 weeks, and two-year or life-long study of cancer in normal (nontransgenic) CD-1, ODC, CBA/S, and B6C3F1 mice exposed to cellphone fields like the personal digital cellular (PDC) phone, digital advanced mobile phone system (DAMPS) fields, global system for mobile communications (GSM-900) fields, digital cellular system (DCS), and time division multiple access (TDMA) fields are presented. Results reveal that: exposure to DAMPS and TDMA in 19 and 58 weeks, respectively, did not indicate cocarcinogenic effect on skin tumorigenesis; the two year study on the carcinogenic potential in female and male B6C3F1 exposed to GSM-900 and DCS-1800 fields did not show any overall increase in the incidence of tumours; and the specific absorption rate (SAR) in restrained mice are varied widely (by as much as 85-fold) for both GSM and DCS exposure. View full abstract»

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  • 2009 IEEE International Ultrasonics Symposium

    Page(s): 123
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  • IEEE expert now: Do you know what I'm talking about?

    Page(s): 124 - 126
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Aims & Scope

IEEE Microwave Magazine is intended to serve primarily as a source of information of interest to professionals in the field of microwave theory and techniques.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
John Wood
Maxim Integrated Products, Inc.

San Jose, CA      USA
john.wood@ieee.org
Phone:+1 480 577 0927