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Microwave and Wireless Components Letters, IEEE

Issue 11 • Date Nov. 2004

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  • Table of contents

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

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  • Provisional model technique in the FDTD analysis of high-Q resonators

    Page(s): 501 - 503
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (192 KB) |  | HTML iconHTML  

    We propose A technique for extracting Q-factors and resonant frequencies of resonators from signal models constructed using samples provided by a time-domain simulator. The method involves two models. The first model is a provisional one and serves one to generate additional samples that prevent the original sequence from being corrupted during signal processing. The second model is the final one and gives directly the quality factors and the resonant frequencies for the structures of interest. We show the application of the new technique to the fast time domain analysis of structures with the unloaded Q-factor exceeding 106. View full abstract»

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  • A fully integrated 24-dBm CMOS power amplifier for 802.11a WLAN applications

    Page(s): 504 - 506
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (385 KB) |  | HTML iconHTML  

    A fully integrated 24-dBm complementary metal oxide semiconductor (CMOS) power amplifier (PA) for 5-GHz WLAN applications is implemented using 0.18-μm CMOS foundry process. It consists of differential three-stage amplifiers and fully integrated input/output matching circuits. The amplifier shows a P1 of 21.8 dBm, power added efficiency of 13%, and gain of 21 dB, respectively. The saturated output power is above 24.1 dBm. This shows the highest output power among the reported 5-GHz CMOS PAs as well as completely satisfying IEEE 802.11a transmitter back off requirement. View full abstract»

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  • Demonstration of a backward wave in a single split ring resonator and wire loaded finline

    Page(s): 507 - 509
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (384 KB) |  | HTML iconHTML  

    A finline-based left-handed transmission line is presented and analyzed. The transmission line is periodically loaded by single split ring resonators and thin wires in order to synthesize a negative permeability and permittivity propagation medium. The propagation properties are computed by means of full-wave frequency analysis of scattering parameters from which the band diagram is derived. A backward wave behavior is predicted and demonstrated unambiguously from ab-initio simulations. The phase front is observed to be in opposite direction with respect to the energy one for a finite five-unit cell X band prototype. View full abstract»

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  • Multiport investigation of the coupling of high-impedance probes

    Page(s): 510 - 512
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (160 KB) |  | HTML iconHTML  

    We used an on-wafer measurement technique that combines two- and three-port frequency-domain mismatch corrections in order to characterize the influence of a high-impedance probe on a device under test. The procedure quantifies the probe's load of the circuit, and the coupling between the probe and the device. View full abstract»

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  • On the current source implementation for the ADI-FDTD method

    Page(s): 513 - 515
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (176 KB) |  | HTML iconHTML  

    The current source implementation for the alternating-direction implicit finite-difference time-domain (ADI-FDTD) method is examined in this letter. By regarding the ADI-FDTD method as an approximate factorization of the Crank-Nicolson scheme, current source is naturally coupled into simulations. As a result, field distribution is much more improved and free of asymmetry. View full abstract»

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  • Quasi-TEM model of magnetostatic-surface wave excitation in microstrip lines

    Page(s): 516 - 518
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (272 KB) |  | HTML iconHTML  

    The per unit length capacitance and inductance of a YIG-loaded microstrip line are computed in the frame of a quasi-transverse electromagnetic approach. The transmission line parameters, i.e., the complex propagation constant and the complex characteristic impedance are computed from them and the insertion loss of a finite-length YIG-loaded microstrip line is obtained using the simple transmission line model. In particular, it is shown that this model is suitable even for the magnetostatic regime. View full abstract»

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  • Application of singular value decomposition on FDTD simulation result - a novel approach for modal analysis of complex electromagnetic problems

    Page(s): 519 - 521
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (168 KB) |  | HTML iconHTML  

    We have proposed that application of singular value decomposition on finite-difference time-domain simulations is best suited for modal analysis of complex real-life electromagnetic problems. This combination of two powerful techniques yields a wealth of information about the complete mode structure which cannot be otherwise obtained. This is particularly important for a real-life system having complex geometry and consisting of a range of materials from good conductors to dielectrics and this is further complicated by the existence of broad-band excitation. This hybrid approach is versatile, accurate, and computationally efficient. View full abstract»

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  • A 0.3-25-GHz ultra-wideband mixer using commercial 0.18-μm CMOS technology

    Page(s): 522 - 524
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (361 KB) |  | HTML iconHTML  

    An ultra-wideband mixer using standard complementary metal oxide semiconductor (CMOS) technology was first proposed in this paper. This broadband mixer achieves measured conversion gain of 11 /spl plusmn/ 1.5 dB with a bandwidth of 0.3 to 25 GHz. The mixer was fabricated in a commercial 0.18-μm CMOS technology and demonstrated the highest frequency and bandwidth of operation. It also presented better gain-bandwidth-product performance compared with that of GaAs-based HBT technologies. The chip area is 0.8 × 1 mm2. View full abstract»

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  • A 1.8-V distributed voltage-controlled oscillator module for 5.8-GHz ISM band

    Page(s): 525 - 527
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (472 KB) |  | HTML iconHTML  

    This letter presents the design and implementation of a 1.8-V 5.8-GHz distributed voltage-controlled oscillator module based on bipolar transistors. The oscillator delivered -2-dBm-output power with a current consumption of 11.5 mA. The tuning range achieved was 650 MHz. The measured phase noise was -100 dBc/Hz at 1-MHz offset. The circuit construction was simple and robust and no buffer amplifier was needed. The design can be used for 5.8-GHz ISM band wireless LAN applications. View full abstract»

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  • An 8-20-GHz wide-band LNA design and the analysis of its input matching mechanism

    Page(s): 528 - 530
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (288 KB) |  | HTML iconHTML  

    A wide-band low-noise amplifier (LNA) design is presented with -10 dB input reflection coefficient and 100-K noise temperature over the 8-20-GHz frequency range at room temperature. This LNA can be cooled down in a liquid helium cryostat to have 10-K noise temperature for the purpose of radio-astronomy application. To achieve its wide-band characteristics, a novel input matching mechanism is proposed, which combines the high-frequency inductive feedback and the low-frequency capacitive feedback. The recognition and comprehensive interpretation of this new input matching mechanism is crucial for future development of ultra-wide-band LNAs. View full abstract»

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  • Microstrip "wiggly-line" bandpass filters with multispurious rejection

    Page(s): 531 - 533
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (240 KB) |  | HTML iconHTML  

    A method to achieve the rejection of multiple spurious passbands in parallel-coupled-line microstrip bandpass filters is proposed. As it was previously demonstrated by the authors, using a continuous perturbation of the width of the coupled-lines following a sinusoidal law, the wave impedance can be modulated so that the first undesired harmonic passband of the filter is rejected, while the desired passband is maintained virtually unaltered. In this letter, the scope of the method is extended to reject multiple spurious passbands by employing different periods in each coupled-line section tuned to the different bands to be rejected. Simulated and measured data show that for an order-seven bandpass filter prototype, a rejection level exceeding 30 dB is obtained in the first four spurious passbands, while the desired pass-band is kept almost unaltered. View full abstract»

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  • A reconfigurable microstrip antenna for switchable polarization

    Page(s): 534 - 536
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2024 KB) |  | HTML iconHTML  

    A novel reconfigurable microstrip antenna with switchable polarization sense is proposed. The proposed antenna has a simple structure, consisting of a corner-truncated square radiating patch, four small triangular conductors, and a microstrip line feed. Using independently biased PIN diodes on the patch, it can produce linear polarization, or left- or right-hand circular polarization according to bias voltages. From the measured results, low cross-polarization levels when operated in the linear state and good axial ratios in the circular state are observed. View full abstract»

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  • Unconditionally stable ADI-FDTD formulations of the APML for frequency-dependent media

    Page(s): 537 - 539
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (176 KB) |  | HTML iconHTML  

    Unconditional stable formulations of the anisotropic perfectly matched layer (APML) are presented for truncating frequency-dependent media. The formulations are based on the auxiliary differential equation and the alternating direction implicit finite-difference time-domain (ADI-FDTD) methods. Numerical examples carried out in one and two dimensions show that the proposed formulations remain unconditionally stable with inclusion of material dispersion into ADI-FDTD implementation of APML. View full abstract»

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  • A low-phase noise LC-QVCO in CMOS technology

    Page(s): 540 - 542
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (322 KB) |  | HTML iconHTML  

    This letter presents a source-injection parallel coupled (SIPC) quadrature voltage-controlled oscillator (QVCO) topology. In the proposed SIPC-QVCO, compared to the conventional parallel-coupled LC-QVCO (P-QVCO), the coupling transistors are configured in a way so that the 1/f noise, contributed by the coupling transistors at the output, can be avoided. The newly proposed SIPC-QVCO and conventional P-QVCO are fabricated based on 0.25 μm CMOS technology. The phase noise of SIPC-QVCO measured at 1.5 GHz shows more than 10 dB improvement than that of the conventional P-QVCO over the offset frequency range of 10 k /spl sim/ 1 MHz while dissipating the same amount of power. View full abstract»

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    Page(s): 543
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    Page(s): 544
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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.

Full Aims & Scope