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Microwave and Wireless Components Letters, IEEE

Issue 4 • Date April 2004

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Displaying Results 1 - 24 of 24
  • Table of contents

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

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  • A simple and accurate model for microstrip structures with slotted ground plane

    Page(s): 133 - 135
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (264 KB) |  | HTML iconHTML  

    A simple and accurate circuit model for microstrip filtering structures with slotted ground plane is presented. The unit cell model consists of a series inductance and shunt capacitance for the microstrip line, an ideal transmission line characterized by its impedance and electrical length for the slot, and an ideal transformer to model coupling to the slot. The coupling mechanism to the slots resonances and subsequent emergence of transmission gaps is explained for different positions of the microstrip line. Excellent agreement with measurement is demonstrated over the broad bandwidth of dc to 20 GHz. View full abstract»

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  • Compact stub type microstrip bandpass filter using defected ground plane

    Page(s): 136 - 138
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (128 KB) |  | HTML iconHTML  

    Usually a defected ground plane structure (DGS) provides only a band-reject response. However, in this work we introduce a simple band-accept circuit element in the DGS and developed a microstrip stub type compact 3-pole bandpass filter (BPF) at 4.2 GHz. The BPF has bandwidth and insertion loss 38% and 0.6 dB respectively. It has better than 25 dB rejection in the stopband up to 12 GHz. View full abstract»

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  • Numerical through-resistor (TR) calibration technique for modeling of microwave integrated circuits

    Page(s): 139 - 141
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (216 KB) |  | HTML iconHTML  

    A through-resistor (TR) calibration procedure is proposed for parameter extraction and accurate modeling of planar discontinuities and circuits by using a full-wave technique such as method of moments (MoM). This new scheme allows the effective use of a commercial electromagnetic field simulator in removing inherent numerical noises or errors in simulation, and making the parameter extraction for circuit models. A microstrip open-end and a microstrip gap are studied and effectiveness of this new scheme is verified. View full abstract»

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  • A flip-chip packaged coplanar 94 GHz amplifier module with efficient suppression of parasitic substrate effects

    Page(s): 145 - 147
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (209 KB) |  | HTML iconHTML  

    A flip-chip mounted W-band amplifier module with more than 15 dB gain between 82 and 105 GHz has been developed, based on a 0.15 μm GaAs PHEMT technology. To predict the influence of the flip-chip transition, an equivalent circuit model of the flip-chip interconnects was developed. Lossy silicon (n-Si) flip-chip carriers were used to successfully minimize parasitic substrate modes and feed back effects. The flip-chip assembled coplanar 94 GHz amplifier MMIC was packaged in a WR-10 waveguide mount, using CPW-to-waveguide transitions realized on quartz substrates. View full abstract»

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  • Design of an internal quad-band antenna for mobile phones

    Page(s): 148 - 150
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (208 KB) |  | HTML iconHTML  

    This letter presents the design of a compact Planar Inverted-F Antenna (PIFA) suitable for cellular telephone applications. The quarter-wavelength antenna combines the use of a slot, shorted parasitic patches and capacitive loads to achieve multiband operation. The commercial electromagnetic software IE3D is used to design and optimize the structure. The resulting antenna can operate from 880 to 960 MHz and 1710 to 2170 MHz covering GSM, DCS, PCS, and UMTS standards with a VSWR better than 2.5. Good agreement is found between simulated and measured results. View full abstract»

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  • Improving accuracy of FDTD simulations in layered biological tissues

    Page(s): 151 - 152
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (96 KB) |  | HTML iconHTML  

    This letter demonstrates a possibility of improving accuracy of the continuous wave steady-state FDTD prediction of the EM field distribution in the layered biological tissues by reducing the numerical dispersion error via appropriate direct modification of the constitutive parameters of the tissues. The attractiveness of the approach lies in that the enhanced accuracy of the FDTD prediction is obtained at the negligible cost of a trivial pre-processing of the material parameters. View full abstract»

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  • An analog compensation method for asymmetric IMD characteristics of power amplifier

    Page(s): 153 - 155
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (272 KB) |  | HTML iconHTML  

    The modulation frequency affects the asymmetric intermodulation distortion (IMD) products of a RF power amplifier. This effect reduces IMD cancellation performance of power amplifiers in connection with predistortion linearization. A phase extraction method to determine phase difference between upper and lower third-order IMD products and a phase compensation circuit using an envelope injection technique is proposed. The experimental results demonstrate a significant improvement in the third-order IMD cancellation performance. View full abstract»

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  • An ultra-low power InAs/AlSb HEMT Ka-band low-noise amplifier

    Page(s): 156 - 158
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (213 KB) |  | HTML iconHTML  

    The first antimonide-based compound semiconductor (ABCS) MMIC, a Ka-Band low-noise amplifier using 0.25-μm gate length InAs/AlSb metamorphic HEMTs, has been fabricated and characterized on a 75 μm GaAs substrate. The compact 1.1 mm2 three-stage Ka-band LNA demonstrated an average of 2.1 dB noise-figure between 34-36 GHz with an associated gain of 22 dB. The measured dc power dissipation of the ABCS LNA was an ultra-low 1.5 mW per stage, or 4.5 mW total. This is less than one-tenth the dc power dissipation of a typical equivalent InGaAs/AlGaAs/GaAs HEMT LNA. Operation with degraded gain and noise figure at 1.1 mW total dc power dissipation is also verified. These results demonstrate the outstanding potential of ABCS HEMT technology for mobile and space-based millimeter-wave applications. View full abstract»

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  • A 5 mW and 5% efficiency 210 GHz InP-based heterostructure barrier varactor quintupler

    Page(s): 159 - 161
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (128 KB) |  | HTML iconHTML  

    This letter reviews the design, construction, and measurement of a 210 GHz heterostructure barrier varactor frequency quintupler. The quintupler utilizes planar heterostructure barrier varactors (HBVs) based on the InGaAs/InAlAs/AlAs material system and has produced a measured output power of 5.2 mW with 5.2% conversion efficiency at 210 GHz. This performance is comparable to the state-of-the-art results reported in the literature for HBV frequency triplers operating at millimeter and submillimeter wavelengths. View full abstract»

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  • Low-profile circularly polarized rectifying antenna for wireless power transmission at 5.8 GHz

    Page(s): 162 - 164
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (248 KB) |  | HTML iconHTML  

    Portable devices operating without batteries are sometimes desired in wireless applications such as RFID (Radio Frequency Identification) and telemetry. A novel circularly polarized shorted annular ring-slot rectenna (rectifying antenna) on a 0.5 mm thick flexible microwave laminate is proposed for the powering of these devices. Output dc voltage of 1.3 V and axial ratio of 1.5 dB were measured when 32 dBm microwave power was transmitted at 5.8 GHz over a distance of 2 m. Comparing the results with a rectenna designed on a thick rigid laminate, similar performance was observed. View full abstract»

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  • Multilevel model order reduction

    Page(s): 165 - 167
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (160 KB) |  | HTML iconHTML  

    We present a multilevel Model Order Reduction scheme for enhancing numerical analysis of electromagnetic fields by means of grid based techniques. The scheme allows one to create nested macromodels and combine macromodels with the Fast Frequency Sweep. The implementation of the method is illustrated on the Finite Difference Frequency Domain technique and efficient nodal order reduction algorithm (ENOR) but the concept can easily be applied also for other mesh based methods and other order reduction schemes. View full abstract»

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  • On the numerical errors in the 2D FE/FDTD algorithm for different hybridization schemes

    Page(s): 168 - 170
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (288 KB) |  | HTML iconHTML  

    Numerical experiments are carried out to study the accuracy of the two-dimensional Finite-Element/Finite-Difference Time-Domain (FE/FDTD) hybrid algorithm with three different hybridization schemes. The physical space is split into two domains viz., the finite difference (FD) and finite element (FE) domains. In the FD domain, a uniform Cartesian grid is used and in the FE domain, triangular elements with edge vector basis functions are used. Newmark-β scheme is used for temporal discretization in the FE domain. The unphysical reflections introduced by the FE domain for the different schemes are compared by computing the 2-D radar cross section of the FE domain surrounded by the FD domain. Computed results of scattering by a PEC circular cylinder for TEz incidence using the three schemes and the traditional FDTD algorithm are presented. View full abstract»

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  • Tunability and bandwidth of microstrip filters fabricated on magnetized ferrites

    Page(s): 171 - 173
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (152 KB) |  | HTML iconHTML  

    The method of moments in the spectral domain is applied to the rigorous full-wave analysis of coupled line microstrip filters fabricated on magnetized ferrites. The results show that the center frequency of the filters can be tuned over a wide range by adjusting the magnitude of the bias magnetic field of the ferrite substrates. However, the filters bandwidth is reduced as the tuning frequency increases. This bandwidth reduction is explained in terms of the behavior of the resonant frequencies and quality factors of the resonators included in the filters. View full abstract»

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  • Fast synthesis of coupled-resonator filters

    Page(s): 174 - 176
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (144 KB) |  | HTML iconHTML  

    This letter proposes a new quickly converging technique for the synthesis of coupling matrix of cross-coupled resonator filters. The method formulates the synthesis as a nonlinear least squares problem involving the zeroes and poles of short circuit input and output admittances, as well as eigenvalues of the coupling matrix and its principal sub-matrices. The solution is found via a damped Levenberg-Marquardt method with analytically computed gradients. Numerical tests show that coupling matrices for high order pseudo-elliptical filters can be found in surprisingly few optimization steps. View full abstract»

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  • Propagation in rectangular waveguides periodically loaded with cylindrical posts

    Page(s): 177 - 179
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (224 KB) |  | HTML iconHTML  

    The analysis of propagation in periodically loaded waveguide structures is conducted. The eigenvalue equation is derived to determine the propagation constants of the Floquet modes. Theoretical and experimental investigations of semi-periodic structures and their scattering matrices are performed. The existence of passbands and stopbands, which are characteristic for periodic structures, is shown. View full abstract»

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  • An improved 1D periodic defected ground structure for microstrip line

    Page(s): 180 - 182
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (200 KB) |  | HTML iconHTML  

    A novel one-dimensional (1-D) periodic defected ground structure (DGS) for microstrip line is presented in this letter. Different from the periodic DGS with uniform square-patterned defects, the improved periodic DGS has a compensated microstrip line and the dimensions of the square defects are nonuniform and varied proportionally to the relative amplitudes distribution of the exponential function e1n/ (n denotes the positive integer). A uniform periodic DGS circuit and two improved periodic DGS circuits are designed, fabricated, and measured. Measurements show that the latter exhibit more excellent performances by suppressing ripples and enlarging stopband bandwidth. View full abstract»

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  • A reflectodirective system using a composite right/left-handed (CRLH) leaky-wave antenna and heterodyne mixing

    Page(s): 183 - 185
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (304 KB)  

    This letter presents a novel reflecto-directive system using a composite right/left-handed (CRLH) leaky-wave (LW) antenna and heterodyne mixing. The system receives a signal at a fixed frequency with a patch antenna and reflects it back toward any desired angle by tuning the LO frequency of a mixer. The performances of the system are demonstrated experimentally: 5 GHz incoming signals at -30°, 0° and +30° are detected and transmitted, or "reflected", to -20° at 3.5 GHz, +20° at 4.5 GHz and +50° at 5.5 GHz in agreement with the angle-frequency relationship of the CRLH antenna. View full abstract»

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  • 2004 IEEE Compound Semiconductor IC Symposium

    Page(s): 186
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  • 16th Asia Pacific Microwave Conference (APMC `04)

    Page(s): 187
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  • 13th Topical Meeting on Electrical Performance of Electronic Packaging (EPEP 2004)

    Page(s): 188
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  • IEEE Microwave and Wireless Components Letters Information for authors

    Page(s): c3
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  • IEEE Microwave and Wireless Components Letters blank page

    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