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3G/4G Technologies

Cover Story

  • Aug. 12, 2011
    article
    Microwaves and RF

    Low Power ADCs Arm Adaptive Scopes

    This trio of power-efficient analog-to-digital converters supports sampling rates to 1 GSamples/Sas well as programmable control of channel switching and operating modesfor applications through 1 GHz....More

News

  • Aug. 12, 2011
    article
    Microwaves and RF

    Ambient EM Energy Powers Small Devices

    The environment is filled with ambient electromagnetic (EM) energy, which is transmitted from sources like cell-phone networks, satellite-communications systems, and radio and TV transmitters. At Georgia Tech Research Institute, researchers ......More
  • Aug. 12, 2011
    article
    Microwaves and RF

    System Proves Its Worth In TV White-Space Trial

    QUITE A FEW FIRMS have emerged with solutions in the recently liberated television white-space band. At the heart of Adaptrum's system, for instance, is cognitive-radio technology that uses any available spectrum below 1 GHz. In late June, this firm ......More
  • Aug. 12, 2011
    article
    Microwaves and RF

    Market Prediction

    THE GLOBAL MARKET FOR TELEMEDICINE is projected to be $23 billion in 2015, after increasing at a five-year compound annual growth rate (CAGR) of 18.6%. The global market for telemedicine can be broken down into two segments: telehospital/clinic and ......More
  • Aug. 12, 2011
    article
    Microwaves and RF

    Optical-Networking Chip Pushes Fiber To Home

    An Ethernet-Passive-Optical-Networking (EPON) chip has been created to advance the development of fiber to the home (FTTH). Hailing from Qualcomm Atheros, the QCA88291-Gigabit EPON chip consumes less than 200 mW for grid applications when ......More
  • Jul. 15, 2008
    article
    Microwaves and RF

    Kudos

    ACTON, MAAzimuth Systems, a provider of wireless broadband test equipment and channel emulators for WiMAX, 4G and Wi-Fi, announced that its ACE 400WB MIMO Channel Emulator has been awarded the 2008 MITX Technology Customer Impact Award. The MITX ......More
  • Jan. 19, 2011
    article
    Microwaves and RF

    People

    QUALCOMM, INC.Elected DR. FRANCISCO ROS to its board of directors. Ros brings more than 25 years of telecommunications experience to the position. He recently served as Secretary of State (Vice Minister) of the Government of Spain. VERIZON ......More
  • Aug. 12, 2011
    article
    Microwaves and RF

    China Smartphone Shipments Explode

    Shown is a forecast of China's domestic smartphone shipments (in thousands of units). CHINESE SMARTPHONE shipments will increase by a record 53% this year, according to new research from the IHS iSuppli China Electronics ......More
  • Aug. 12, 2011
    article
    Microwaves and RF

    Vecima Networks Sells $8 Million Of Radio Spectrum

    WITH SPECTRUM so much in demand by today's carriers, some firms with spectrum holdings are looking to capitalize on their assets. Vecima Networks, Inc. is a notable example, as its YourLink, Inc. subsidiary has agreed to sell a portion of ......More
  • Aug. 12, 2011
    article
    Microwaves and RF

    Carriers Petition Obama To Clear Sub-3-GHz Government Bands

    TO MEET CURRENT and projected demands for wireless technology, US carriers have repeatedly pointed out that they need more frequency spectrum. To strengthen their cause, they are even willing to band together. At the end of July, for instance, ......More

Design Features

  • Aug. 12, 2011
    article
    Microwaves and RF

    Linearize Power Amps With RF Predistortion

    The use of RF predistortion can improve the linearity of power amplifiers at power levels as low as 500 mW over a wide range of operating conditions for maintaining low system power consumption and cost....More
  • Aug. 12, 2011
    article
    Microwaves and RF

    Sidebands Are Not Necessary

    These experiments show that pulsed systems can not only operate effectively without sideband energy, but can actually benefit in performance by removing the sidebands....More
  • Aug. 12, 2011
    article
    Microwaves and RF

    Stub-Loaded Resonators Tune Dual-Band BPF

    By constructing a circuit with modified stub-loaded resonators, a dual-band bandpass filter was designed and fabricated for WLAN applications at 2.45 and 5.80 GHz with out-of-band rejection through 14 GHz....More
  • Aug. 12, 2011
    article
    Microwaves and RF

    Optimize a Waveguide Mode Converter

    Finite-element analysis helps in the design of an X-band rectangular waveguide to overmoded circular waveguide mode converter in a compact structure capable of handling high power levels....More
  • Aug. 12, 2011
    article
    Microwaves and RF

    Synthesize Distributed Element Filter Designs

    A filter design program adds power, speed, and accuracy through its addition of co-simulation capabilities, thanks to some well-known electromagnetic simulation software tools....More

Special Report

  • Aug. 12, 2011
    article
    Microwaves and RF

    Shrinking Cells Impact Base-Station Design 3

    As the telecommunications industry truly begins to explore the use of femto- and picocells, the way we think of cellular base stations is starting to shift....More
  • Aug. 12, 2011
    article
    Microwaves and RF

    Technologies Are Forgotten, Not Gone

    The RF/microwave industry has seen its share of different technologies rise since World War II, often to be replaced in whole or part by a newer, alternative technology with some advantages....More
  • Aug. 12, 2011
    article
    Microwaves and RF

    Bracing For The Cellular Explosion

    Although it seems as if cellular technology has been with us forever, bringing wireless communications to the world has been a fast-moving evolutionary development....More
  • Aug. 12, 2011
    article
    Microwaves and RF

    Product Introductions Abound At IMS 2011

    Over 600 exhibitors made the trip to the Baltimore Convention Center for this years IMS, bringing news of software, hardware, test equipment, and even company acquisitions....More
  • Aug. 12, 2011
    article
    Microwaves and RF

    Cold-War Cooperation Birthed Search And Rescue System

    This photo shows the first sea rescue via SarSaT/cOSPaS, which took place 300 miles off the coast of New England on October 10, 1982. Since 1982, NOAA's Search and Rescue Satellite Aided Tracking (SARSAT) ......More
  • Aug. 12, 2011
    article
    Microwaves and RF

    ADCs and DACs Pack More Power

    This sampling of high-speed, wide-bandwidth ADCs and DACs provide signal digitization and generation at high resolution for a wide range of commercial, industrial, and military applications....More
  • Feb. 18, 2011
    article
    Microwaves and RF

    Interview: Barrie Gilbert, Analog Devices Technology Fellow

    Take a peek inside the multifaceted mind of Barrie Gilbert, Analog Devices Technology Fellow, and find out the story behind the Gilbert cell, what advice he has for today's young engineers, and some of his favorite stories from his long and impressive career....More

Editorial

  • Aug. 12, 2011
    article
    Microwaves and RF

    When Analog And Digital Worlds Collide

    Good models require great imaginations. Whether at the device, circuit, or system level, computer-aided-engineering (CAE) software simulators will only take you so far when trying to model a design. The rest must come from good old-fashioned ......More

Feedback

  • Aug. 12, 2011
    article
    Microwaves and RF

    Let's Treat Leeson Right

    Your June issue featured an interesting article by Eoin Carey on the effects of VCO tuning bandwidth on phase noise. The article proposed that the phase noise of two otherwise similar VCOs that were based on the same design approaches and ......More
  • Aug. 12, 2011
    article
    Microwaves and RF

    Setting The Record Straight

    In a recent Microwaves & RF newsletter, we noticed that you referred to our company as "Richardson Electronics." Earlier this year, we re-launched as Richardson RFPD, Inc. (an Arrow Electronics Company). Previously, our company was part ......More

R&D Roundup

  • Aug. 12, 2011
    article
    Microwaves and RF

    Antenna On Thin Substrate Serves Ultra Wideband

    SQUARE AND circular monopole antennas for ultra-wideband (UWB) applications are known for providing a relatively small impedance bandwidth. Numerous techniques have been proposed to improve the matching over a broad bandwidth. One ......More
  • Aug. 12, 2011
    article
    Microwaves and RF

    Compact Vivaldi Antenna Targets UWB Applications

    A HYBRID RF PHOTONICS system, which utilizes optical links and an RF transducer at the antenna, may reportedly provide data transmission with a bandwidth beyond 100 GHz. Many are therefore eying an ultra-wideband (UWB) antenna array as a ......More
  • Aug. 12, 2011
    article
    Microwaves and RF

    Inductor-Less LNA Promises To Cut Noise

    TODAY'S WIRELESS industry requires the ongoing development of multiband/multi-standard terminals for low-cost and multifunction transceivers. The current trendusing single wideband front endsaccommodates all of the diverse wireless ......More

Application Notes

  • Aug. 12, 2011
    article
    Microwaves and RF

    Choose The Right Cable Assembly

    Although today's cable assemblies are smaller and lighter, the market demands that they last longer and cost less. Yet they are being used in more challenging RF and microwave environments, where they are exposed to extreme temperatures, ......More
  • Aug. 12, 2011
    article
    Microwaves and RF

    Master Key Field Measurements For DVB-T/H And ISBD-T

    Handheld field-test instruments have become critical to today's communications and broadcasting networks, performing tasks ranging from performance verification to problem solving. For example, an application note from Anritsu Co. focuses on the ......More

RF Primer

  • Aug. 12, 2011
    article
    Microwaves and RF

    Delivering Data Via Digital Modulation

    Digital modulation in many forms has proven to be an effective means of delivering voice, data, and video through the limited channel bandwidths of modern wireless communications networks....More

Product Feature

  • Aug. 12, 2011
    article
    Microwaves and RF

    GaN Drives Devices And Pallet Amplifiers

    These rugged GaN-on-SiC discrete HEMT devices and pallet amplifiers bring high pulsed and CW power levels and ease of installation to applications through 3.1 GHz....More
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