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  • Aug. 15, 2012
    Article

    Alliance Will Take M2M Solutions Global

    Considering how far wireless technology has come, it is surprising that communicating while traveling internationally is still so problematic. Beyond high roaming charges, technical issues arise. Often, people are unable to use their devices from place to place—or at least do so seamlessly. This problem is exacerbated for business travelers, who are relying on their equipment and machines to perform key tasks....More
  • Aug. 15, 2012
    Article

    Agilent Sets AT4 Acquisition In Motion 1

    Malaga, Spain-based AT4 wireless (www.at4wireless.com) continuously expands its capabilities to provide test solutions for the latest wireless-communications technologies. It is therefore not surprising that Agilent Technologies (www.agilent.com) has signed a definitive agreement to acquire the assets of the firm’s Test Systems business. With that wireless test portfolio, Agilent plans to offer its customers an even broader set of test solutions—especially in the rapidly growing Long Term Evolution (LTE) market....More
  • Aug. 15, 2012
    Article

    Funding Helps Semiconductor Testing Reach 100 W CW

    To improve the chances of a design’s first-pass success, test and measurement and software solutions have become more closely linked....More
  • Aug. 14, 2012
    Article

    Mixed-Signal Baseband IC Cuts Power Consumption At 60 GHz

    A lot of attention is being given to the 7-GHz bandwidth available in the 60-GHz band—largely with the hope of achieving multi-gigabit-per-second wireless links....More
  • Aug. 14, 2012
    Article

    Assessing Different Ultranarrowband Formats 1

    Conventional modulation formats make use of upper and lower sidebands to send information with a carrier signal. Some formats use both sidebands, and are categorized as double-sideband (DSB) modulation, while some methods can transfer information by means of single-sideband (SSB) modulation. Ultrawideband (UWB) modulation spreads signals across a wide expanse of bandwidth, while ultranarrowband (UNB) modulation does not require the use of the sideband spectra....More
  • Aug. 14, 2012
    Article

    CMOS Models Transistor Distortion 2

    Nonlinear behavior in active devices can lead to distortion and lost information in communications systems that rely on those devices. Because silicon CMOS transistors are so widely used in analog, digital, and mixed-signal circuits, understanding the nonlinear characteristics of these transistors can serve to improve performance in highly integrated circuits (ICs). To that end, a new transistor model was developed for high-frequency silicon CMOS transistors, using a superposition method to quantify the individual contributions of different nonlinear elements....More
  • Aug. 14, 2012
    Article

    Fractal Antenna Aims At 2.9 To 14.6 GHz

    Broadband antennas are needed for emerging applications using the ultrawideband (UWB) frequency range from approximately 3.1 to 10.6 GHz. To serve such applications in wireless communications and medical-imaging systems, a fractal antenna using an Appollian-shaped gasket with coplanar-waveguide (CPW) feed was developed. The design offers tremendous potential for various UWB applications, with an experimental impedance bandwidth of 133.905% from 2.89 to 14.60 GHz. The antenna features an omnidirectional H-plane radiation pattern and a bidirectional E-plane radiation pattern....More
  • Aug. 14, 2012
    Article

    Dual-Band Coupler Links With CRLH Lines

    ouplers are critical components in communications systems, commonly used to isolate receivers from transmitters. They are also vital parts of test-and-measurement applications.1 In a communications system, for example, a coupler’s isolation is significant since poor isolation results in reduced receiver sensitivity and higher DC offset. A number of approaches have been used to improve isolation between coupler transmit and receive ports,2-6 but many of these techniques lead to larger circuits, and few apply to dual-band couplers....More
  • Aug. 14, 2012
    Article

    Modulator Manages High-Speed Data

    Satellite communications (satcom) offer ubiquitous service coverage from space, albeit with limited bandwidth. As a result, service providers seek to use higher-order modulation schemes to achieve high data rates over limited available bandwidth. In support of high-speed data, an eight-state, phase-shift-keying (8PSK) modulator was designed for use at X-band satcom frequencies, with data rates as fast as 1.5 Gb/s....More
  • Aug. 14, 2012
    Article

    Ceramic Substrate Shrinks Patch Antenna

    Wireless electronic products continue to shrink in size, requiring ever-smaller antennas. To fill this need, the authors developed a three-stack wideband patch antenna on aluminum-oxide ceramic substrate material. The high relative dielectric constant of the substrate made it possible to reduce the dimensions of the antenna without compromising the performance of the component. The antenna was designed with the aid of commercial electromagnetic (EM) simulation software—namely, the High-Frequency Structure Simulator (HFSS) from Ansoft (www.ansys.com)....More
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