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Microwave and Wireless Components Letters, IEEE

Issue 3 • Date March 2006

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Displaying Results 1 - 22 of 22
  • Table of contents

    Page(s): c1
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  • IEEE Microwave and Wireless Components Letters publication information

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  • On the accuracy of the nearly PMLfor nonlinear FDTD domains

    Page(s): 101 - 103
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (144 KB) |  | HTML iconHTML  

    In this letter, the first implementation of the nearly perfectly matched layer (NPML) for truncating nonlinear dispersive finite-difference time-domain (FDTD) grids is presented. In the proposed method, the Z-transform theory is employed in the FDTD implementations of the NPML formulations. The performance of the NPML was investigated through a numerical example carried out in two-dimensional Kerr-Raman nonlinear and Lorentz-dispersive domain, and it has been observed that the NPML is capable of absorbing nonlinear electromagnetic waves. View full abstract»

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  • Short-circuited CPW multiple-mode resonator for ultra-wideband (UWB) bandpass filter

    Page(s): 104 - 106
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (280 KB) |  | HTML iconHTML  

    An ultra-wideband (UWB: 3.1-10.6 GHz) bandpass filter (BPF) on coplanar waveguide (CPW) is proposed, designed and implemented. A nonuniform CPW multiple-mode resonator with short-circuited ends is constructed and its first three resonant modes are properly allocated around the lower-end, center and higher-end of the specified UWB band. This CPW resonator is then driven at two ends by two parallel-coupled CPW lines with dispersive inductive coupling degree. By properly reallocating the enhanced coupling peak toward the UWB's center, a five-pole CPW BPF with one full-wavelength can be eventually constituted. Its UWB bandpass performance is characterized and optimized on the basis of a simple transmission-line network. Predicted results are confirmed by experiment. Measured results achieve the insertion loss <1.5dB and group delay variation <0.35ns in the realized 3.3 to 10.4GHz UWB passband. View full abstract»

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  • Compact microstrip bandpass filter with sharp transition bands

    Page(s): 107 - 109
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (86 KB) |  | HTML iconHTML  

    The design of a two-pole compact microstrip bandpass filter is presented. The filter consists of only one miniaturized center-stubbed half-wavelength resonator and tapped-line input/output ports, and exhibits transmission zeros at both sides of the passband. Therefore, it is very compact, and provides sharp transition bands. The measurement results of filters designed at 4.4GHz are given to validate the theory View full abstract»

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  • Synthesis of dual-band bandpass filters using successive frequency transformations and circuit conversions

    Page(s): 110 - 112
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (128 KB) |  | HTML iconHTML  

    A novel method is proposed to synthesize dual-band bandpass filters (BPFs) from a prototype low-pass filter. By implementing successive frequency transformations and circuit conversions, a new filter topology is obtained which consists of only admittance inverters and series resonators, and is thereby easy to be realized by using conventional distributed elements. A dual-band BPF with center frequencies of 1.8GHz and 2.4GHz is designed and fabricated using microstrip lines and stubs. The simulated and measured results show a good agreement and validate the proposed theory. View full abstract»

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  • Design of a planar inverted-F Antenna with very wide impedance bandwidth

    Page(s): 113 - 115
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (230 KB) |  | HTML iconHTML  

    This letter presents a novel wideband planar inverted F-antenna, which covers GSM850/DCS1800/DCS1900/ IMT2000/WLAN/DMB services at the same time. The proposed antenna consists of a main patch with a pair of slant slits and L-shaped patch and occupies a total volume of 15times44times8mm3. The triple frequency bands are obtained by changing the length and width of a slant slit 1 on the main patch. A very wide impedance bandwidth characteristic is achieved by optimizing not only the length and height of a L-shaped patch between the main patch and ground plane but also the length and width of a pair of slits on the main patch which is excited by the modified coplanar waveguide-feed. Good broadside radiation patterns are achieved for all six-frequency bands of interest View full abstract»

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  • Wideband beam and null steering using a rectangular array of planar monopoles

    Page(s): 116 - 118
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (204 KB) |  | HTML iconHTML  

    This article presents the design of a wideband rectangular array of planar monopoles, which is able to steer its beam and nulls over a wide frequency band using real-valued weights. These weights can be realized in practice by amplifiers or attenuators leading to a low cost development of a wideband array antenna with beam and null steering capability. The weights are determined by applying an inverse discrete Fourier transform to an assumed radiation pattern. This wideband beam and null forming concept is verified by full electromagnetic simulations which take into account mutual coupling effects between the array elements View full abstract»

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  • Model dispersive media in finite-difference time-domain method with complex-conjugate pole-residue pairs

    Page(s): 119 - 121
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    In this letter, we show that both Debye poles and Lorentz pole pairs are special cases of complex-conjugate pole-residue pairs, and the general form of such pairs is in fact far more efficient than the commonly used Debye poles and Lorentz pole pairs for modeling real dispersive media with the finite-difference time-domain method. We first derive an alternative formulation of the auxiliary differential equation method for arbitrary dispersive media based on general complex-conjugate pole-residue pairs. We then numerically demonstrate the efficiency of using these pairs in modeling dispersive media View full abstract»

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  • A TDIE-based asynchronous electromagnetic-circuit simulator

    Page(s): 122 - 124
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (235 KB) |  | HTML iconHTML  

    A time-domain integral-equation based hybrid electromagnetic (EM)-circuit (CKT) simulator that allows the signals (fields/voltages/currents) in each EM or CKT subsystem to be sampled and tracked using a local, subsystem-specific, time-step size is proposed. The proposed asynchronous time-stepping/coupling approach generalizes the standard synchronous time-stepping/coupling approach, where all the signals in the entire system are tracked using one system-global time-step size. The nonlinear analysis of a bipolar junction transistor driven chip-to-package interconnect demonstrates that the asynchronous simulator exhibits improved accuracy, efficiency, and convergence View full abstract»

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  • On the validity of conventional MOSFET nonlinearity characterization at RF switching

    Page(s): 125 - 127
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (175 KB) |  | HTML iconHTML  

    We analyze the linearity of metal oxide semiconductor field effect transistors (MOSFETs) at radio frequency switching using the conventional extraction method of IP3, measured harmonic distortion (HD), and a surface-potential-based MOSFET model for circuit-simulation. The applicability of the conventional extraction method of IP3 at low frequency to represent IP3 at high frequency is also investigated. At low frequency, measured HD characteristics and extracted IP3 values correspond to the prediction by the model which adopts the quasistatic approximation, i.e., instantaneous carrier response is assumed. Beyond half of the cutoff frequency, the carrier response delay enhances the MOSFET nonlinearity, which is manifested by a decreased first order harmonic and a pronounced curvature of the third order harmonic. Consequently, the conventional extraction method of IP3 value from the intersection point of linearly extrapolated first and third harmonics becomes unreliable View full abstract»

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  • A CMOS single-pole-four-throw switch

    Page(s): 128 - 130
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (549 KB) |  | HTML iconHTML  

    An one-pole-four-throw switch that can be used to switch between the band select filters of four cellular bands and a single input programmable low noise amplifier has been demonstrated in a 0.18-mum complementary metal oxide semiconductor process. Its insertion losses are 0.39, 0.61, 0.66, and 0.75dB in the GSM900, DCS1800, PCS1900, and wide-band code division multiple access system bands. IIP3's of the switch are ~27dBm and isolations are greater than 22dB View full abstract»

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  • A low power and low noise p-HEMT ku band VCO

    Page(s): 131 - 133
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (612 KB) |  | HTML iconHTML  

    In this letter, we report a differential 12-GHz voltage-controlled oscillator (VCO) implemented using a commercial GaAs pseudomorphic high electron mobility transistor (p-HEMT) process. The VCO can operate with 3mW of dc power. The single-side-band phase noise at 1-MHz offset from the carrier is -116dBc and is achieved with 15mW of dc power consumption. This VCO has a figure of merit of -190.5dBc which is the best that has been reported for a p-HEMT VCO in the authors' knowledge View full abstract»

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  • A fully integrated differential CMOS LNA for 3-5-GHz ultrawideband wireless receivers

    Page(s): 134 - 136
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (475 KB) |  | HTML iconHTML  

    A fully integrated differential low-power low-noise amplifier (LNA) for ultrawideband (UWB) systems operating in the 3-5-GHz frequency range is presented. A two-section LC ladder input network is exploited to achieve excellent input match in a wideband fashion and to optimize the noise performance. Prototypes fabricated in a digital 0.13-mum complementary metal oxide semiconductor technology show the following performance: 9.5-dB peak power gain, 3.5-dB minimum noise figure, -6-dBm input-referred 1-dB compression point, and -0.8-dBm input-referred third-order intercept point, while drawing 11mA from a 1.5-V supply. The realized LNA is compared with previously reported LNAs tailored for the same frequency range View full abstract»

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  • Design and analysis of a low-power discrete phase modulator in a 0.13-μm logic CMOS process

    Page(s): 137 - 139
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (299 KB) |  | HTML iconHTML  

    This letter reports the design and analysis of a low-power discrete constant envelope phase modulator. The modulator discretely changes the phase of a constant envelope carrier according to the input digital data bits. A test chip was fabricated in a 0.13-μm logic complementary metal oxide semiconductor process. The modulator consumes 2mA from a 1.2-V supply, has an operating frequency range between 1.5GHz and 3.3GHz, and can support a data rate up to 225Mbps with better than 5.5% error vector magnitude. The modulator can be designed to generate different modulation schemes by digitally controlling the phase and/or amplitude of the carrier, and therefore potentially can be used in software defined radios. View full abstract»

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  • Non-charge related mechanism affecting capacitive MEMS switch lifetime

    Page(s): 140 - 142
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (117 KB) |  | HTML iconHTML  

    Capacitive microelectromechanical system switches were operated for extended periods of time while tracking the voltages where the beam pulls-in and releases from the insulator surface. Changes in pull-in voltage are explained with charges tunneling from the beam into the insulator. However, charging cannot account for changes in the release voltage which result in switches sticking to the insulator. Pull-in and release voltage measurements provide valuable information on the processes limiting switch lifetime View full abstract»

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  • A novel LTCC miniaturized dualband balun

    Page(s): 143 - 145
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    In this letter, a novel low temperature cofired ceramic (LTCC) miniaturized dualband balun using a tapered line structure has been presented. The key concept for our dualband solution is by employing tapered line structures in the conventional Marchand baluns. In our new design, we have demonstrated the tapered line structure can shift the periodic operation frequency to a desired frequency band. A sample balun design has been presented. The novel LTCC dualband balun has been simulated and verified by measurement. The measured results exhibit that the proposed balun can easily cover the important radio frequency bands at 2.4GHz, 5.25GHz, and 5.85GHz. View full abstract»

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  • The 7th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems

    Page(s): 146
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    Page(s): 147
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    Page(s): 148
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  • IEEE Microwave and Wireless Components Letters Information for authors

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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.

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