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  • May 17, 2012
    article
    Microwaves and RF

    SIW And CDGS Combine For BPF

    By combining lowpass and highpass filters, it is possible to design and fabricate an extremely compact bandpass filter with relative bandwidth that exceeds 78%....More
  • May 17, 2012
    article
    Microwaves and RF

    Navigating Multilayer Microwave PCB Tradeoffs 1

    There are numerous ways to assemble multilayer microwave printed circuits, depending on whether cost or performance is important, and when factors such as ease of fabrication and reliability are critical....More
  • May 17, 2012
    article
    Microwaves and RF

    Match Mixers To BTS LTE Receivers

    Determining the half-IF spurious requirements for an LTE cellular communications receiver can ease the task of choosing the appropriate frequency mixer for that design....More
  • Apr. 6, 2012
    article
    Microwaves and RF

    Resonators Support UHF MRI Systems

    These numerical methods, backed by various simulation methods, helped develop a high-Q resonator that is well suited for magnetic resonance imaging applications at UHF....More
  • Apr. 6, 2012
    article
    Microwaves and RF

    Design a CDBA In 0.18-m CMOS

    By designing a current difference buffer amplifier (CDBA) circuit for fabrication in a commercial CMOS semiconductor process, the versatility of this component can be applied in a variety of applications....More
  • Apr. 6, 2012
    article
    Microwaves and RF

    Two-Horn Antenna Aims At UWB Use

    This compact antenna design features a simple, easy-to-manufacture structure with coplanar-waveguide feed that can achieve high peak gain from 3.0 to 13.9 GHz....More
  • Apr. 6, 2012
    article
    Microwaves and RF

    Sorting Through EM Simulators

    Matching an electromagnetic simulator to a particular application requires an understanding of the different simulation technologies at the heart of these software tools....More
  • Apr. 6, 2012
    article
    Microwaves and RF

    Optimizing PLL Performance levels

    Designing a PLL synthesizer for modern mobile communications systems involves achieving the proper balance among a number of tradeoffs, including spurious levels and frequency switching speed....More
  • Mar. 14, 2012
    article
    Microwaves and RF

    CPW Antenna Aims At UWB Applications

    This simple microstrip antenna features a coplanar-waveguide feed and a U-shaped structure in its radiating element to provide a strong notch for interfering signals at 5 GHz....More
  • Mar. 14, 2012
    article
    Microwaves and RF

    Tackling Multi-Bit Attenuator Designs

    Designing an accurate digital step attenuator (DSA) with outstanding RF/microwave performance requires careful attention to detail and knowledge of semiconductor process variables....More
  • Mar. 14, 2012
    article
    Microwaves and RF

    Fabricating HF Opamp Filters

    Lowpass filters based on operational amplifiers can provide useful circuit solutions at frequencies to about 50 MHz, although other options are available at higher frequencies....More
  • Mar. 14, 2012
    article
    Microwaves and RF

    LTE Front End Scans Three Bands

    This design approach shows how to realize a low-cost scanning receiver for LTE TDD system applications, where fast tuning speed, high measurement accuracy, small size, and low power consumption are critical....More
  • Mar. 14, 2012
    article
    Microwaves and RF

    UWB Lowpass Filter Features Wide Stopband

    By applying cascaded folded stepped impedance resonators, this lowpass filter achieves extremely wide passband and stopband and can be fabricated in a very small circuit size for UWB applications....More
  • Mar. 14, 2012
    article
    Microwaves and RF

    Synthesizer Serves MB-OFDM UWB

    This silicon CMOS frequency synthesizer achieves high sideband suppression for use in 14-band ultrawideband communications transceivers employing MB-OFDM techniques....More
  • Mar. 14, 2012
    article
    Microwaves and RF

    Compare Compact UHF Antennas

    Approaches were applied to miniaturize two different types of antennas for applications at UHF, without losing performance when losing physical volume....More
  • Feb. 16, 2012
    article
    Microwaves and RF

    Tiny UWB Antenna Notches Two Bands

    By using a simple coplanar-waveguide (CPW) feed and two resonant structures, this relatively simple antenna can cover the full UWB frequency range with notches for two occupied bands....More
  • Feb. 16, 2012
    article
    Microwaves and RF

    Current Reuse Enhances UWB LNA

    This broadband low-noise CMOS amplifier covers the ultrawideband (UWB) communications frequencies from 3.1 to 10.6 GHz with the aid of current-reuse techniques....More
  • Feb. 16, 2012
    article
    Microwaves and RF

    CMOS Yields UHF RFID Transmitter

    This integrated RFID transmitter includes an upconversion mixer and power amplifier for generating high-output voltage waveforms with relatively high efficiency from 860 to 960 MHz....More
  • Feb. 16, 2012
    article
    Microwaves and RF

    Compensating For DGS Filter Loss

    Dr. Ahmed Boutejdar and Dr. Abbas Omar Novel circuit design elements such as defected-ground-structure (DGS) resonators and electromagnetic-band-gap (EBG) structures have helped shrink the size of microstrip circuits, including filters and antennas. In ......More
  • Feb. 16, 2012
    article
    Microwaves and RF

    Filter's Multiple TZs Afford Flexible Tuning

    This dual-mode microstrip filter employs multiple controllable transmission zeros to realize the required selectivity or rejection of unwanted spurious signals....More
  • Feb. 16, 2012
    article
    Microwaves and RF

    Assemble A Compact UWB Printed Monopole

    Based on the shape of a half-periodic sinusoid, this novel antenna features CPW feedlines and compact size while covering the full 3.1-to-10.6-GHz UWB range....More
  • Feb. 16, 2012
    article
    Microwaves and RF

    C-Shaped Slot Serves UWB Antenna

    The use of a novel C-shaped slot helps define band-notched characteristics for this broadband microstrip antenna design for use across the UWB frequency band....More
  • Jan. 25, 2012
    article
    Microwaves and RF

    Broadside Coupler Channels 1 To 10 GHz

    The combined use of two leading microwave simulators helped to create this broadband 90-deg. coupler which features two 19-section broadside couplers as part of a tandem structure....More
  • Jan. 25, 2012
    article
    Microwaves and RF

    Perfect A PLL LTE Synthesizer

    This analysis of a phase-lock-loop frequency synthesizer highlights the importance of the loop filter in final synthesizer performance, and how to analyze the noise contributions of the synthesizers component parts....More
  • Jan. 25, 2012
    article
    Microwaves and RF

    Bandpass Filters Feature Dual Bands

    This filter achieves dual passbands with high selectivity in a compact size by using asymmetrical separated spirals resonators embedded in microstrip transmission lines....More

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