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Microwave and Wireless Components Letters, IEEE

Issue 7 • Date July 2009

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  • Table of contents

    Publication Year: 2009 , Page(s): C1
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  • IEEE Microwave and Wireless Components Letters publication information

    Publication Year: 2009 , Page(s): C2
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  • Radial Perfectly Matched Layer for the ADI-FDTD Method

    Publication Year: 2009 , Page(s): 425 - 427
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (140 KB) |  | HTML iconHTML  

    In this letter, a circular absorbing boundary using the radial perfectly matched layer (RPML) is investigated for the alternating-direction-implicit finite-difference time-domain (ADI-FDTD) method. A staircase approach is used to approximate the circular boundary so that it is directly compatible with the commonly used Yee's lattice. The proposed RPML boundary is computationally more efficient than the traditional rectangular PML boundary. It was found that more than 20% of the memory and computation time can be saved by using the proposed method. View full abstract»

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  • Time-Domain Green's Function-Based Sensitivity Analysis of Multiconductor Transmission Lines With Nonlinear Terminations

    Publication Year: 2009 , Page(s): 428 - 430
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (191 KB) |  | HTML iconHTML  

    Time-domain sensitivity analysis of multiconductor transmission lines is derived from the dyadic Green's function of the 1-D wave propagation problem. The rational nature of the Green's function permits the generation of a time-domain macromodel for the computation of transient voltage sensitivities with respect to both electrical and physical parameters, completely avoiding similarity transformation. Through simulations of multiconductor transmission lines with linear and nonlinear terminations, comparisons are made with the perturbative approach and standard frequency-domain techniques for multiconductor transmission lines. View full abstract»

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  • Enhanced CRLH Transmission Line Performances Using a Lattice Network Unit Cell

    Publication Year: 2009 , Page(s): 431 - 433
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (313 KB) |  | HTML iconHTML  

    A novel topology for the composite right/left-handed transmission line (CRLH TL) is presented. This type of CRLH TLs has the advantage of exhibiting an all-pass behavior and a frequency-independent characteristic impedance, in the so-called balanced case. Moreover, it presents a larger group velocity than its conventional counterpart, thereby allowing for wider bandwidth operation. This letter investigates the fundamental properties of this structure, and demonstrates them by full-wave simulation and measurement results on a practical implementation in parallel stripline technology. View full abstract»

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  • Microstrip Coupled Line Composite Right/Left-Handed Unit Cell

    Publication Year: 2009 , Page(s): 434 - 436
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (329 KB) |  | HTML iconHTML  

    This letter presents a new composite right/left-handed (CRLH) unit cell, which takes advantage of the microstrip coupled line even and odd modes. The new cell does not require vias, it is patterned on a single metal layer, and it has a geometrical circuit model that simplifies the design flow. A novel CRLH transmission line is also proposed. It does not have a cutoff frequency, the operating bandwidth extends from dc to 4 GHz, and it is balanced at the first and second transition frequencies between right- and left-handed bands. The theoretical expectations have been confirmed by EM simulations and measurements. View full abstract»

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  • Design of a Low Loss Metallo-Dielectric EBG Waveguide at Submillimeter Wavelengths

    Publication Year: 2009 , Page(s): 437 - 439
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (362 KB) |  | HTML iconHTML  

    In this letter we show the viability of using concentric cylindrically-periodic (CP) dielectrics to realize low-loss propagation at submillimeter wavelengths. Most of the power in the CP Waveguide (WG) is confined to an air core propagating a TE01 mode. The TM11 mode degeneracy is removed over a very wide bandwidth by a series of periodically spaced dielectric rings that are optimized in thickness and spacing. The new waveguide differs from classical Bragg fibers in that we use only a small number of dielectric layers (2-4), and terminate the outer layer with an external metal coating. We include several designs and describe the optimization procedure that was used to realize structures with low propagation and bend loss. View full abstract»

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  • Miniaturized Microstrip Wilkinson Power Divider With Harmonic Suppression

    Publication Year: 2009 , Page(s): 440 - 442
    Cited by:  Papers (21)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (221 KB) |  | HTML iconHTML  

    A microstrip Wilkinson power divider with harmonic suppression and size reduction is presented in this letter. The proposed power divider not only effectively reduces its occupied area to 36.5% of the conventional design at 2.65 GHz but also has higher order harmonics suppression. From the measured results, a 29 dB suppression for the third harmonic and a 34 dB suppression for the fifth harmonic are achieved while maintaining the characteristics of a conventional Wilkinson power divider. Based on a 15 dB return-loss criteria, the measured fractional bandwidth is 48%. At an operation frequency of 2.65 GHz, the insertion losses are better than 3.4 dB, the return loss is 27 dB, and the isolation is better than 22 dB. View full abstract»

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  • Microstrip Balun Over High Impedance Wire-Ground

    Publication Year: 2009 , Page(s): 443 - 445
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (404 KB) |  | HTML iconHTML  

    This letter presents a novel idea for the design of coupled line balun, where the operation relies on rejecting the common mode due to the presence of a high impedance wire-ground. This concept is verified by circuit modeling, EM simulations, and practical measurements of the proposed structure. The simple, though accurate, circuit model provides clear understanding of the concept of operation and simplifies the design flow and optimization. The novel design exhibits reliable performance at 2.4 GHz with a 50% bandwidth (1.8-3 GHz), an amplitude imbalance less than 0.5 dB, a return loss better than 15 dB, and a phase imbalance less than 10deg. View full abstract»

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  • A Miniaturized Multilayered Marchand Balun Using Coupled Artificial Transmission Lines

    Publication Year: 2009 , Page(s): 446 - 448
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (352 KB) |  | HTML iconHTML  

    A miniaturized Marchand balun is investigated in this letter. The Marchand balun is realized on a six-layered printed circuit board by integration of two coupled artificial transmission line sections. An additional artificial line is inserted in-between the coupled lines for compensating the asymmetry. With the help of the even odd mode analysis, the electrical characteristics of the coupled lines are investigated in detail. The proposed balun has the smallest occupied size among the previous designs on printed circuit boards. It features excellent amplitude and phase imbalance, and a comparable return loss bandwidth as well. The design methodology, simulation, and experimental results are introduced thoroughly in the letter. View full abstract»

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  • A Narrow Band Dual Mode HTS Patch Filter With High Power Capability

    Publication Year: 2009 , Page(s): 449 - 451
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (386 KB) |  | HTML iconHTML  

    A novel structure is presented to optimize the design of narrow band dual mode patch filters. Using this method, a narrow band dual mode high power HTS filter with center frequency 2.015 GHz, fractional bandwidth less than 0.35%, return loss greater than 20 dB, near band-edge rejection close to -45 dB, and insertion loss less than 0.2 dB has been designed and fabricated. The filter can work at a power of 11.7 W without obvious deterioration of its transmission response. View full abstract»

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  • LTCC Wideband Filter Design With Selectivity Enhancement

    Publication Year: 2009 , Page(s): 452 - 454
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (179 KB) |  | HTML iconHTML  

    A new design scheme for the wideband filters with the low temperature co-fired ceramic (LTCC) technology is proposed in this letter. Based on the traditional second-order combline filter, an extra shunt capacitor is added in the middle of the coupled line, and a new transmission zero is thus obtained. The proposed design not only possesses excellent selectivity at both sides of the passband, the fractional bandwidth can also be as wide as 86%. To validate the design scheme, the proposed technique is applied to the third-order combline filter and realized by using the LTCC technology. The wide-band filter with passband of 3.1-5.1 GHz is obtained. With four transmission-zeros, the selectivity and out-band rejection of the third-order filter is further improved from those of the second-order designs. View full abstract»

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  • 150 GHz Band-Pass Filter Using LTCC Technology

    Publication Year: 2009 , Page(s): 455 - 457
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (197 KB) |  | HTML iconHTML  

    A low temperature co-fired ceramic 150 GHz bandpass filter is, for the first time, designed and manufactured. Experimental electric performances are encouraging and validate the use of LTCC technology at submillimeter wave range. A Chebyshev 2-pole bandpass filter is achieved, with 1.6% bandwidth and 4.6 dB insertion loss. The unloaded quality factor is found to be 290. View full abstract»

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  • A Novel 3–5 GHz Active Matched Filter for Impulse Radio Ultra-Wideband

    Publication Year: 2009 , Page(s): 458 - 460
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (279 KB) |  | HTML iconHTML  

    In this letter, a novel active matched filter for UWB-IR lower band (3.1-4.85 GHz) is presented. The signal to noise ratio is improved at the output using a tapped delay line with a common source amplifier. An artificial transmission line is used for wideband impedance matching. The matched filter achieves a power gain of 9.8 dB at center frequency. Input matching is better than -19 dB and output matching is better than -15 dB. The averaged SNR improvement is 4.6 dB using peak detection. Input referred 1-dB compression point is 0.7 dBm at the center frequency. The matched filter is biased from a 1.5 V supply with a total power consumption of 38 mW. View full abstract»

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  • Microwave Active Inductors

    Publication Year: 2009 , Page(s): 461 - 463
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (330 KB) |  | HTML iconHTML  

    In this letter, the experimental proofs of two microwave active inductors with very high quality factor, namely Differential Boot-Strapped Inductor (D-BSI) and Cross-Coupled Differential Boot-Strapped Inductor (CCD-BSI), are presented. These circuits can be effectively implemented in modern RF-CMOS processes for high-Q equivalent integrated inductors at high frequency. The cases of study at 13 GHz have been designed and implemented in a modern standard 90 nm bulk CMOS process. The measurements on the test-chips show an equivalent inductance close to 3.2 nH with an associated quality factor up to 400 and a wide linearity range. View full abstract»

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  • A 2.4 GHz Current-Reused CMOS Balun-Mixer

    Publication Year: 2009 , Page(s): 464 - 466
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (439 KB) |  | HTML iconHTML  

    A 0.13 mum CMOS 2.4 GHz balun-mixer is proposed, where a current-reused noise-canceling topology is adopted as the transconductance stage to reduce dc power consumption. After frequency conversion, noise-cancellation is achieved only when a specified condition is satisfied, but single-to-differential signal conversion is inherently obtained by the mixer operation. The fabricated chip shows a conversion gain of 13.5 dB, a single-side-band (SSB) noise figure of 8 dB, and an input-referred IP3 of - 6 dBm, while consuming only 3.5 mA from a 1.5 V supply voltage. View full abstract»

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  • A 38% Tuning Bandwidth Low Phase Noise Differential Voltage Controlled Oscillator Using a 0.5 \mu m E/D-PHEMT Process

    Publication Year: 2009 , Page(s): 467 - 469
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (407 KB) |  | HTML iconHTML  

    This paper presents a 38% tuning bandwidth low phase noise differential voltage controlled oscillator (VCO) using a 0.5 mum enhancement/depletion-pseudomorphic high-electron mobility transistor (E/D-PHEMT) process. The proposed VCO is based on a differential topology with two common-gate transistors. To achieve a wide tuning range with low phase noise, varactor in the VCO core employs the E-mode PHEMT device. The frequency of the VCO is from 18.8 to 27.5 GHz with a tuning bandwidth of 38% and an output power of higher than 5 dBm. The VCO demonstrates a phase noise of -109 dBc/Hz at 1 MHz offset frequency. This circuit can be compared with the VCOs fabricated using the advanced InP HBT technologies. View full abstract»

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  • Low Noise Wide Tuning Range Quadrature Ring Oscillator for Multi-Standard Transceiver

    Publication Year: 2009 , Page(s): 470 - 472
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (262 KB) |  | HTML iconHTML  

    This letter presents a low phase noise quadrature ring oscillator with new start-up circuit. The oscillator architecture is a two-stage differential ring with an additional pair of transition-assistance transistors. The circuit was implemented in 0.18 mum CMOS technology and the measured tuning range of the prototype device is from 1.7 GHz to 5.5 GHz and figure of merit (FOM) is -162 dB. The proposed area of application is the core of the local oscillator in a multi-standard wireless transceiver. View full abstract»

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  • Peak Class F and Inverse Class F Drain Efficiencies Using Si LDMOS in a Limited Bandwidth Design

    Publication Year: 2009 , Page(s): 473 - 475
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (315 KB) |  | HTML iconHTML  

    This paper compares two popular high power, high efficiency modes of operation, class F and inverse class F, and assesses the peak obtainable drain efficiencies when using Si LDMOS devices in a limited bandwidth design. Optimum class F and inverse class F conditions are presented using active harmonic load-pull measurements, and it was found that a higher drain efficiency was achieved in the class F configuration. This result is due to the limitations imposed by the soft voltage breakdown occurring due to the extended voltage swings inherent to inverse class F, as a consequence generating unwanted current content during the off cycle. This significantly reduces the peak measured efficiency using Si LDMOS devices when implementing an inverse class F design with a drain bias of 28 V. By reducing the drain bias to 18 V, to accommodate the voltage extension of inverse class F, it became possible to achieve peak measured efficiencies much closer to what theory predicted. View full abstract»

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  • A Wideband Analog Predistortion Power Amplifier With Multi-Branch Nonlinear Path for Memory-Effect Compensation

    Publication Year: 2009 , Page(s): 476 - 478
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (630 KB) |  | HTML iconHTML  

    A wideband, multi-branch analog predistorter (MBAPD) is reported to compensate for memory effects as well as memoryless nonlinearity of the power amplifier (PA) for repeater systems with wideband modulated signals. For verification, the MBAPD with three-branch nonlinear path is implemented with a 30 W class-AB PA and tested using a two-carrier wideband code division multiple access (WCDMA) signal with 15 MHz tone spacing at 2.14 GHz. From the measured results at an average output power of 33 dBm, the proposed MBAPD shows the adjacent channel leakage ratios (ACLRs) at plusmn15 MHz offset of -60.4 dBc and -60.2 dBc, which are an improvement of over 25 dB and 12 dB, compared to the PAs without APD and with conventional APD, respectively. View full abstract»

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  • A 2.4 GHz Fully Integrated Linear CMOS Power Amplifier With Discrete Power Control

    Publication Year: 2009 , Page(s): 479 - 481
    Cited by:  Papers (19)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (385 KB) |  | HTML iconHTML  

    A fully integrated 2.4 GHz CMOS power amplifier (PA) in a standard 0.18 mum CMOS process is presented. Using a parallel-combining transformer (PCT) and gate bias adaptation, a discrete power control of the PA is achieved for enhancing the efficiency at power back-off. With a 3.3 V power supply, the PA has a peak drain efficiency of 33% at 31 dBm peak output power. By applying discrete power control, a reduction of 650 mA in current consumption can be achieved over the low output power range while satisfying the EVM requirements of WLAN 802.11g and WiMAX 802.16e signals. View full abstract»

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  • Wideband LNA Compatible for Differential and Single-Ended Inputs

    Publication Year: 2009 , Page(s): 482 - 484
    Cited by:  Papers (10)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (273 KB) |  | HTML iconHTML  

    This letter presents a wideband low-noise amplifier (LNA) that supports both differential and single-ended inputs, while providing differential output. The LNA is implemented in 0.13 mum CMOS technology. For sub-1 GHz wideband applications, this LNA achieves 22.5 dB voltage gain, +1 dBm IIP3, and 2.5 dB NF in the differential receiving mode, while achieving 23 dB voltage gain, -0.5 dBm IIP3, and 2.65 dB NF in the single-ended receiving mode. The LNA core circuit draws 2.5 mA from 1.2 V supply voltage, and occupies a small chip area of 0.06 mm2. View full abstract»

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  • IEEE Microwave and Wireless Components Letters Reviewers List

    Publication Year: 2009 , Page(s): C3
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    Freely Available from IEEE
  • Blank page [back cover]

    Publication Year: 2009 , Page(s): C4
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Aims & Scope

The IEEE Microwave and Wireless Components Letters (MWCL) publishes three page papers that focus on microwave theory, techniques and applications as they relate to components, devices, circuits, biological effects, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals.

Full Aims & Scope