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Microwave and Wireless Components Letters, IEEE

Issue 12 • Date Dec. 2009

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Displaying Results 1 - 25 of 30
  • Table of contents

    Publication Year: 2009 , Page(s): C1 - C4
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    Freely Available from IEEE
  • IEEE Microwave and Wireless Components Letters publication information

    Publication Year: 2009 , Page(s): C2
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    Freely Available from IEEE
  • Foreword Announcement - Change of Editorship

    Publication Year: 2009 , Page(s): 761
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  • Fast Solution of Electromagnetic Scattering From Thin Dielectric Coated PEC by MLFMA and Successive Overrelaxation Iterative Technique

    Publication Year: 2009 , Page(s): 762 - 764
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (155 KB) |  | HTML iconHTML  

    To speed up solution of electromagnetic scattering from 3-D conducting structures coated by thin dielectric material, the multilevel fast multipole algorithm and successive overrelaxation iterative technique are applied into the thin dielectric sheet (TDS) model. Based on the TDS model, only the induced current density on the surface of the conducting structure is required. By adding unitary operator for unknown current on both sides of the electric field integral equation, a successive overrelaxation iteration is constructed. The total computational expense is reduced greatly while reasonable accuracy is maintained. Numerical results demonstrate the validity and efficiency of the present method. View full abstract»

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  • Adaptive Stopping Criterion for Fast Time Domain Characterization of Microwave Components

    Publication Year: 2009 , Page(s): 765 - 767
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (183 KB) |  | HTML iconHTML  

    This letter proposes a novel adaptive stopping criterion that facilitates a fast time domain characterization of microwave components. By successively computing a rational macromodel based on time-limited transient responses of the microwave component under study, the proposed stopping criterion limits the number of time steps required to capture the frequency behavior up to a predefined accuracy level. Therefore, it is particularly useful for systems where the transient responses decay slowly. View full abstract»

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  • Delay Extracted Stable Rational Approximations for Tabulated Networks With Periodic Reflections

    Publication Year: 2009 , Page(s): 768 - 770
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (183 KB) |  | HTML iconHTML  

    This letter presents an efficient and stable macromodeling formulation for electrically long high-speed modules characterized by tabulated data. The resulting system of delay differential equations contains a reduced number of delayed rational terms for networks with dominant periodic reflections leading to faster transient simulations. A method is also presented for macromodel stability verification and enforcement. View full abstract»

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  • Simple Equivalent Circuit Model of a Stripline in Inhomogeneous Dielectric Media

    Publication Year: 2009 , Page(s): 771 - 773
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (227 KB) |  | HTML iconHTML  

    Equivalent circuit models of a stripline have been proposed previously but most of them are either in a very complex form or are only able to model striplines in homogeneous media. In this work, modal decomposition technique is applied and a simple equivalent circuit model for a stripline in inhomogeneous substrate is proposed. Comparison with other models is also presented. View full abstract»

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  • A Novel Microstrip Filter Using Three-Mode Stepped Impedance Resonator (TSIR)

    Publication Year: 2009 , Page(s): 774 - 776
    Cited by:  Papers (31)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (382 KB) |  | HTML iconHTML  

    A novel microstrip filter using three-mode stepped impedance resonator (TSIR) is presented, with its coupling scheme given so as to accurately predict its desired performance. A T-type open stub is introduced into the design of a miniaturized TSIR. It is shown that the developed filter exhibits quasi-elliptic characteristics with sharp skirt and wide stopband. Good agreements are obtained between its measured and simulated S-parameters. View full abstract»

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  • An Extended Doublet Substrate Integrated Waveguide (SIW) Bandpass Filter With a Complementary Split Ring Resonator (CSRR)

    Publication Year: 2009 , Page(s): 777 - 779
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (386 KB) |  | HTML iconHTML  

    An ldquoextended doubletrdquo bandpass filter (BPF) is proposed using a substrate integrated waveguide (SIW) cavity with a complementary split ring resonator (CSRR) etched on its top metal plane. Thus, a single-layer BPF with two transmission zeros is realized successfully, with no additional area or layers occupied. The measured and simulated S-parameters of the filter are presented to show its predicted performance, with good agreements obtained between them. View full abstract»

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  • Design of the Compact Dual-Band Bandpass Filter With High Isolation for GPS/WLAN Applications

    Publication Year: 2009 , Page(s): 780 - 782
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (303 KB) |  | HTML iconHTML  

    In this letter, a novel compact dual-band bandpass filter (BPF) is designed to achieve the characteristic of low insertion loss and high isolation for global position system (GPS)/wireless local area network (WLAN) applications. This BPF is implemented by properly selecting the impedance ratio (R) and physical length ratio (alpha) of the asymmetric stepped-impedance resonator (SIR) with one step discontinuity. The coupling coefficient between the coupled asymmetric SIRs is calculated by using full-wave simulator IE3D. The proposed filter has very good measured characteristics including a low insertion loss of 1.1 dB for both passbands, a high isolation insertion loss of 55 dB between the two passbands and a wide stopband rejection of 38 dB from 2.7 to 5.3 GHz. Good agreement with responses of electromagnetic (EM) simulation and measurement is compared. View full abstract»

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  • A Dual-Band Unequal Wilkinson Power Divider With Arbitrary Frequency Ratios

    Publication Year: 2009 , Page(s): 783 - 785
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (359 KB) |  | HTML iconHTML  

    This letter presents a theoretically rigorous investigation and experimental verification for an asymmetrical, unequal power divider working at dual frequency bands. Through the even- and odd-mode analysis that can be applied to dual-band, unequal power divider by assuming virtual open and short points, analytically exact solutions have been derived for the design parameters values. For verification of this analysis, commercially available software including ADS and CST MWS based on circuit theory and full-EM theory, respectively, and already-established equations have been adopted. View full abstract»

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  • A New Unequal Power-Divider Design With Enhanced Insertion Loss Flatness

    Publication Year: 2009 , Page(s): 786 - 788
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (183 KB) |  | HTML iconHTML  

    This letter presents the design of a new, unequal power-divider with enhanced insertion loss flatness. It also features compact and simple layout implementation. For verification, the measured results of prototypes having a center frequency of 1 GHz and power-dividing ratio of 2:1 and 4:1 are given. View full abstract»

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  • A 10:1 Unequal Wilkinson Power Divider Using Coupled Lines With Two Shorts

    Publication Year: 2009 , Page(s): 789 - 791
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (268 KB) |  | HTML iconHTML  

    Abstract-A novel unequal Wilkinson power divider is presented. A coupled-line section with two shorts is proposed to realize the high characteristic impedance line, which cannot be implemented by conventional microstrip fabrication technique due to fabrication limitation. The proposed coupled-line structure is compatible with single layer integration and can be easily designed based on an even-odd mode analysis. As a design example, a 10:1 Wilkinson power divider at 2 GHz is fabricated and measured. The measured -10 dB bandwidth of S11 is about 16%, and the isolation S32 is better than -20 dB. The measured amplitude balance between output port 2 and port 3 is between -10.20 dB and -9.52 dB, and the corresponding phase difference is between 0deg and 4.6deg. View full abstract»

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  • A Generalized Dual-Frequency Transformer for Two Arbitrary Complex Frequency-Dependent Impedances

    Publication Year: 2009 , Page(s): 792 - 794
    Cited by:  Papers (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (216 KB) |  | HTML iconHTML  

    The purpose of this letter is to propose a dual-frequency transformer for two arbitrary complex frequency- dependent impedances (ACF-DIs) and present a generalized T-junction power divider (T-JPD) operating at dual-band with arbitrary power-dividing ratios based on the proposed transformer. By the rigorous analysis of transmission line theory, the closed-form design equations for this generalized transformer are obtained. Using the analytical design method, a kind of generalized T-JPD can be designed to operate at two different frequencies with different power-dividing ratios. Furthermore, numerical examples are simulated and a microstrip T-JPD operating at 1 and 2.4 GHz with different power-dividing ratios (1.5 and 2 dB, respectively) is fabricated. Good agreements between the simulated and measured results can be observed. View full abstract»

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  • Application of Nonuniform Transmission Lines to Ultra Wideband Pulse Shaping

    Publication Year: 2009 , Page(s): 795 - 797
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (469 KB) |  | HTML iconHTML  

    The work presented in this letter demonstrates that nonuniform transmission lines (NUTLs) can be used for pulse shaping applications in ultra wideband pulsed systems and presents an approach to their design for this application. The pulsed waveforms generated are modified Hermite polynomials and encoded pulse trains thereof and are characterised by a broad bandwidth ranging from near DC to over 10 GHz and relatively long temporal duration in the region of nanoseconds. These pulses are more mathematically complex and at least three times higher bandwidth than previously has been reported in the literature. It is also believed to be the first time that modified Hermite polynomial pulses have been generated in practice. The NUTL design approach is verified by test structures fabricated on FR4 circuit board. The results demonstrate that NUTLs, which are completely passive structures, allow generation of complex pulse shapes in applications requiring fast, transient waveforms. View full abstract»

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  • Feed-Through Type Multilayer Capacitor for High Frequency Voltage Noise Suppression

    Publication Year: 2009 , Page(s): 798 - 800
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (225 KB) |  | HTML iconHTML  

    A novel feed-through type multilayer ceramic capacitor (MLCC) is proposed using vertically oriented internal electrodes. The proposed capacitor has a distinctive structure to effectively reduce the parasitic equivalent series inductance (ESL), and thus the noise suppression performance of the capacitor can be greatly improved. Furthermore, it can be made compact with the help of relatively simple terminal structure. Therefore, the capacitor developed here is suitably used as a bypass capacitor in mobile communication systems where miniaturized components with high performance are essentially required. To demonstrate the feasibility and validity of the proposed capacitor, the size 1005 capacitors and evaluation boards have been designed and fabricated. According to the measured results, the proposed capacitor provides the insertion loss of 47.5 dB at 1.0 GHz, and thus the peak to peak voltage noise is reduced from 352 mV to 287 mV by using the proposed capacitor instead of using the regular two terminal MLCC. View full abstract»

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  • A New Microwave Method for Electrical Characterization of Low-Loss Materials

    Publication Year: 2009 , Page(s): 801 - 803
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (255 KB) |  | HTML iconHTML  

    A microwave method is proposed to effectively determine the complex permittivity of low-loss dielectric materials. The method uses raw scattering parameter measurements of an empty cell and a measurement cell (a waveguide or coaxial-line section) with one sample for its two configurations. There are three advantages of the proposed method. First, it does not necessitate any calibration to carry out the microwave measurements. Second, it eliminates the measurement errors arising from sample thickness and inhomogeneity present in the second sample, which is required by other methods. Third, it uses transmission-only scattering parameters of the sample in the theoretical formulations so that it may decrease the measurement errors happening from the phase uncertainty in reflection scattering parameters. The measurement results of two low-loss dielectric materials confirm the accuracy of the proposed method. View full abstract»

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  • Switchable Composite Right/Left-Handed (S-CRLH) Transmission Line Using MEMS Switches

    Publication Year: 2009 , Page(s): 804 - 806
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (780 KB) |  | HTML iconHTML  

    This letter presents a novel switchable composite right/left-handed (S-CRLH) metamaterial transmission line (TL) using MEMS switches. The proposed TL is based on a general CRLH TL with switchable capacitors and switchable shunt inductive stubs. The LH mode of the S-CRLH TL ranges from 7.5 GHz to 10.4 GHz. In these frequencies, the S-CRLH TL is able to switch from a negative phase response (phase lag) to a positive phase response (phase lead), or vice versa. This phase modulation can be obtained through a voltage, due to the use of MEMS switches. The size of the fabricated S-CRLH TL, including bias networks, is 4941 mum times 2076 mum and is compact thanks to the LH mode. View full abstract»

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  • On Estimating and Canceling Parasitic Capacitance in Submillimeter-Wave Planar Schottky Diodes

    Publication Year: 2009 , Page(s): 807 - 809
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (575 KB) |  | HTML iconHTML  

    The equivalent circuit model of a submillimeter planar diode is investigated. In particular, the parasitic finger to pad capacitance that shunts the diode junction severely degrades the performance of frequency multiplier. Therefore, precise estimation of its value is crucial to circuit design in the submillimeter wave range. In this letter, a parallel diode structure is analyzed, and symmetry is utilized to remove parasitic elements external to the finger loop. This analytical approach is verified through measurement on a 200 GHz planar diode circuit. To increase the diode junction capacitance modulation ratio, one possible solution is also suggested. View full abstract»

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  • 15 GHz High-Isolation Sub-Harmonic Mixer With Delay Compensation

    Publication Year: 2009 , Page(s): 810 - 812
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (462 KB) |  | HTML iconHTML  

    A 15-GHz high-isolation sub-harmonic mixer (SHM) with delay compensation is demonstrated in this letter using 0.35 mum SiGe heterojunction bipolar transistor (HBT) technology. The proposed SHM consisting of two parallel stacked-LO mixer cores with opposite LO I/Q inputs substantially improves port-to-port isolation. A mathematical analysis regarding the isolation properties is also included in this letter. Further, a conventional stacked-LO SHM (w/o compensation) is also implemented with the same device sizes and bias conditions for a fair comparison. SHMs w/ and w/o compensation have similar conversion gain of 9/10 dB and noise figure of 14/13.5 dB when fLO = 7.5 GHz. However, the delay compensation technique improves the 2LO-RF/IF isolation by 34/35 dB, the LO-RF/IF isolation by 8/9 dB, and the RF-IF isolation by 22 dB. View full abstract»

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  • A CMOS True Single-Phase-Clock Divider With Differential Outputs

    Publication Year: 2009 , Page(s): 813 - 815
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (359 KB) |  | HTML iconHTML  

    This letter presents a true single-phase-clock (TSPC) divider that takes a single-ended input signal while producing differential outputs. The differential outputs are generated by properly coupling the waveforms of two TSPC dividers. Implemented using TSMC 0.18 mum CMOS technology, the divider is capable of operating from 0.6 to 5 GHz. The phase deviation and amplitude difference of the differential outputs are less than 1.7 degree and 0.41%, respectively, below 3 GHz. The core circuit size of the TSPC divider is 160 mum times 215 mum. View full abstract»

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  • A Dual-Band CMOS Voltage-Controlled Oscillator Implemented With Dual-Resonance LC Tank

    Publication Year: 2009 , Page(s): 816 - 818
    Cited by:  Papers (21)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (402 KB) |  | HTML iconHTML  

    A new fully integrated, dual-band CMOS voltage controlled oscillator (VCO) is presented. The VCO is composed of n-core cross-coupled Colpitts VCOs and was implemented in 0.18 mum CMOS technology with 0.8 V supply voltage. The circuit allows the VCO to operate at two resonant frequencies with a common LC tank. The VCO has two control inputs, one for continuous control of the output frequency and one for band switching. This VCO is configured with 5 GHz and 12 GHz frequency bands with differential outputs. The dual-band VCO operates in 4.78-5.19 GHz and 12.19-12.61 GHz. The phase noises of the VCO operating at 5.11 and 12.2 GHz are -117.16 dBc/Hz and -112.15 dBc/Hz at 1 MHz offset, respectively, while the VCO draws 3.2/2.72 mA and 2.56/2.18 mW consumption at low/high frequency band from a 0.8 V supply. View full abstract»

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  • A Low Voltage Quadrature VCO Implemented With Series Frequency Doublers

    Publication Year: 2009 , Page(s): 819 - 821
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (871 KB) |  | HTML iconHTML  

    Using the transformer coupling technique, this letter presents a new quadrature voltage-controlled oscillator (QVCO) with bottom series-coupled transistors. The proposed CMOS QVCO has been implemented with the TSMC 0.13 mum 1P8M CMOS process, and the die area is 1.03 times 0.914 mm2. At the supply voltage of 1.0 V, the total power consumption is 3.56 mW. The free-running frequency of the QVCO is tunable from 5.43 GHz to 5.92 GHz as the tuning voltage is varied from 0.0 V to 1.0 V. The measured phase noise at 1 MHz frequency offset is -117.98 dBc/Hz at the oscillation frequency of 5.5 GHz and the figure of merit (FOM) of the proposed QVCO is -187.27 dBc/Hz. View full abstract»

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  • A K-Band CMOS Quadrature Frequency Tripler Using Sub-Harmonic Mixer

    Publication Year: 2009 , Page(s): 822 - 824
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (389 KB) |  | HTML iconHTML  

    A low-power frequency tripler is designed by using the sub-harmonic mixer configuration for K-band applications. The proposed circuit features quadrature signal generation, applicable to LO signal synthesis in millimeter-wave wireless transceivers. It achieves conversion gain of -5.7 dB at the output frequency of 21 GHz. Implemented in a 0.18 mum CMOS technology, the circuit consumes power of 7.5 mW with 1.5 V supply voltage. The entire die occupies an area of 1000times1050 mum2. View full abstract»

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  • Helix on Pad-Type Ultra Small-Size Power Amplifiers for WCDMA Handset Applications

    Publication Year: 2009 , Page(s): 825 - 827
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (385 KB) |  | HTML iconHTML  

    Ultra small-size power amplifier (PA) modules were developed for WCDMA handset applications. To reduce the size of the PA modules, the bulky transmission lines and lumped surface mountable chip elements of the conventional output matching network (OMN) were replaced with the proposed helix-on-pad (HoP) and an integrated passive device (iPD), respectively. Three 2 mm times 2 mm single-band PA modules were developed using the proposed OMNs for UMTS Band-5, Band-1, and Band-2 applications. No RF performance degradation was observed from the size-reduced PA modules. For the demonstration of ultimate size reduction, a dual-band PA for UMTS Band-2/ Band-5 application was developed in a 3 mm X 3 mm form-factor. The PAs exhibited adjacent channel leakage ratios (ACLRs) better than -38 dBc over the entire output power range together with power-added efficiencies (PAEs) in excess of 39 % at 28.5 dBm. Besides, the PAs showed good low-power efficiency of 16% at Pout = 16 dBm due to the stage-bypass architecture. The proposed method can be applied in a variety of wireless Tx applications requiring small form-factors and high efficiencies. View full abstract»

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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