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Microwave Magazine, IEEE

Issue 1 • Date February 2009

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Displaying Results 1 - 25 of 44
  • IEEE Microwave Magazine - Feb. 2009

    Page(s): c1
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    Freely Available from IEEE
  • Table of contents - Vol 10 No 1

    Page(s): 3 - 4
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  • Service calls [From the Editor's Desk]

    Page(s): 6
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  • MTT is GOLD! [From the Editors' Desk]

    Page(s): 8 - 10
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  • Presidency overview [President's Column]

    Page(s): 12 - 14
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  • Welcome from your incoming president [President's Column]

    Page(s): 14 - 20
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  • Where Is Waldo? [Microwave Surfing]

    Page(s): 22 - 174
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  • Probing times [Microwave Bytes]

    Page(s): 28 - 34
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  • Near-field direct antenna modulation

    Page(s): 36 - 46
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2749 KB) |  | HTML iconHTML  

    NFDAM systems provide a unique solution for transmitting highly secured direction-dependent data and hence preventing eavesdroppers from properly demodulating the signal. A 60-GHz proof-of-concept chip was designed and measured. View full abstract»

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  • Radar remote monitoring of vital signs

    Page(s): 47 - 56
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    Medical technology has improved remarkably over the past few generations, becoming more sophisticated and less invasive as the years progress. Now, with microwave Doppler radar phase modulation, noncontact respiration and heartbeat monitoring offers an attractive alternative to commonly prescribed chest-strap monitors. Doppler radar uses double-sideband transmission for vital sign detection from four sides of a human body. An unmodulated radio-frequency signal is transmitted toward the human body, where it is phase-modulated by the periodic physiological movement and reflected back to the receiver. The radar receiver captures the reflected signal and demodulates it to extract the vital sign signal components. View full abstract»

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  • Synthesizing microwave resonator filters

    Page(s): 57 - 65
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    In this article, analytic and optimization-based methods for the synthesis of dual-passband microwave filters are presented. First, the frequency transformations for synthesizing dual-passband filters is described. For the filters in which the reflection and transmission zeros cannot be found analytically using frequency transformations, an optimization (or trial-and-error) procedure for a systematic approach is described. The reflection and transmission zeros obtained by the frequency transformation were found to be good initial values for the optimization process. View full abstract»

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  • Frequency-reconfigurable antennas for multiradio wireless platforms

    Page(s): 66 - 83
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    Looking to increase the functionality of current wireless platforms and to improve their quality of service, we have explored the merits of using frequency-reconfigurable antennas as an alternative for multiband antennas. Our study included an analysis of various reconfigurable and multiband structures such as patches, wires, and combinations. Switches, such as radio-frequency microelectromechanical systems (RFMEMS) and p-i-n diodes, were also studied and directly incorporated onto antenna structures to successfully form frequency-reconfigurable antennas. View full abstract»

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  • Low-frequency noise in nonlinear systems

    Page(s): 84 - 92
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    This paper reviews some recent achievements regarding behavior and modeling of low-frequency noise sources that have the potential to improve phase noise simulations significantly. This paper discusses a heuristic interpretation of how time-varying currents affect low-frequency noise sources, review physics-based device simulations, and then present how the sources can be implemented in commercial circuit simulators. Finally, simulations and measurements of GaAs-based heterojunction bipolar transistors (HBTs) are presented. View full abstract»

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  • Inverted-load network for high-power Doherty amplifier

    Page(s): 93 - 98
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2470 KB) |  | HTML iconHTML  

    In this article, a high-power, high-efficiency inverted Doherty power amplifier (PA), having a more compact load network than that of the conventional Doherty amplifier, was designed and implemented for wide-band code-division multiple access (WCDMA) base-station applications. Its configuration and working principle are compared with the conventional Doherty amplifier. For experimental verification, we implemented an inverted Doherty amplifier, using a 190 W peak-envelope-power (PEP) laterally diffused metal-oxide-semiconductor (LDMOS) field-effect transistors (FETs). Using a four-carrier down-link WCDMA signal, we achieved a high power-added efficiency (PAE) of 32% and an average output power level as high as 46.3 dBm at a given adjacent channel leakage ratio (ACLR) level of -30 dBc. This is a 9.5% improvement in efficiency and 1 dB improvement in output power under the same ACLR conditions from those of the balanced class-AB operation using the same devices. View full abstract»

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  • MMICs in the millimeter-wave regime

    Page(s): 99 - 117
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    On the basis of the current status of silicon based MMICs, it is possible to implement millimeter-wave SOC in silicon-based technologies that include the antenna, a medium-power amplifier, a transceiver, an LO (frequency synthesizer), and baseband circuits in a single chip. With certain interconnection schemes, such as flip-chip, to connect the chip to the substrate, it is also possible to integrate the best possible chips for a millimeter-wave communication system. Currently, CMOS is the best choice for the baseband circuits, while GaAs and InP MMICs can provide the best noise/power performance in the transceiver. High-efficiency antennas can be implemented directly on the packaging substrate. The SIP approach has the optimal combinations of the components for the best performance in a particular system. For example, a system in a package including CMOS baseband circuits, GaAs/InP-based transceiver, high-efficiency antenna, and high-power amplifier can achieve the best system characteristics. As we have discussed, the scope of SOC can be expanded along with more advanced MMIC fabrication technology and design techniques. View full abstract»

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  • Microwave radiocommunication (review of Microwave Engineering: Land and Space Radiocommunications by G. Barue; 2008) [Book Review]

    Page(s): 118 - 121
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  • Recently published books [Book Review]

    Page(s): 120
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  • Wideband (review of Essentials of UWB by S. Wood and Dr. R. Aiello; 2008) [Book Review]

    Page(s): 121
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  • IEEE begins work on waveguide standards above 110 GHz [MTT-S Society News]

    Page(s): 122
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  • Student Branch Chapters and social networking [Chapter News]

    Page(s): 124 - 165
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  • Announcement: 13th IEEE Workshop on Signal Propagation on Interconnects

    Page(s): 125
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  • A saturated PA with high efficiency [Technical Committee]

    Page(s): 126 - 133
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    The IEEE MTT-5 student design competition for high-efficiency PAs provides the opportunity for the student to do an in-depth study of a PA from theoretical concept and analysis to fabrication and testing. This competition motivates many students to have a strong interest in a highly efficient PA design and development. The contest rules require the PA to operate at a frequency greater than 1 GHz but less than 20 GHz and produce an output power of greater than 5 W but less than 100 W into a 50 Ω load with a power input of less than 25 dBm. Aparticipant demonstrates the PA at the International Microwave Symposium (IMS), and the designer of the PA with the highest power-added efficiency (PAE) becomes the winning entry of the contest. The PAs designed by previous winners showed PAE with >75% at about 1 GHz frequency range [1]¿[3]. In the 2008 contest, a new rule, which has a frequency weighting factor of the PAE multiplied by (GHz)0.25, was introduced to encourage PA design at higher frequencies. View full abstract»

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  • Student competition for low-power consumption FM receiver design [Technical Committee]

    Page(s): 133 - 137
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    The objective of the Low-Power FM Radio Receiver contest, held during the IMS 2008 in Atlanta, was to "design, construct, measure, and demonstrate an FM radio receiver with low dc (battery) power consumption driving simple earphones/ear buds." It was further specified that "the LPFMR's performance shall be measured while receiving an FM stereo signal from a local FM station with a peak audio output power of 4 mW per channel. The performance is based solely on the input power, which shall be computed as the dc supply voltage times the dc supply current." View full abstract»

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  • A reconfigurable bandpass-bandstop filter based on varactor-loaded closed-ring resonators [Technical Committee]

    Page(s): 138 - 140
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    In this article, a novel reconfigurable bandpass-bandstop filter based on the varactor-loaded closed-ring resonators is presented, where the bandpass and bandstop characteristics can be easily controlled by tuning the varactor bias voltage. This reconfigurability results from the perturbation effect on the degenerated even and odd modes of the closed-ring resonator. When the perturbation varactor is at the series resonance, its reactance vanishes, so a bandstop characteristic is formed. When the perturbation varactor is changed to be capacitive, the bandpass characteristic is generated. Additional varactors, incorporated at input and output ports, are tuned along with the perturbation varactors to maintain good return losses. View full abstract»

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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