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Microwave and Wireless Components Letters, IEEE

Issue 1 • Date Jan. 2011

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Displaying Results 1 - 22 of 22
  • Table of contents

    Page(s): C1 - C4
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  • IEEE Microwave and Wireless Components Letters publication information

    Page(s): C2
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  • GPU Acceleration of Multilevel Solvers for Analysis of Microwave Components With Finite Element Method

    Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (163 KB) |  | HTML iconHTML  

    The letter discusses a fast implementation of the conjugate gradient iterative method with E-field multilevel preconditioner applied to solving real symmetric and sparse systems obtained with vector finite element method. In order to accelerate computations, a graphics processing unit (GPU) was used and significant speed-up (2.61 fold) was achieved comparing to a central processing unit (CPU) based approach. These results indicate that performance of electromagnetic simulations can be significantly improved thereby enabling full wave optimization of microwave components in more manageable time. View full abstract»

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  • A Closed-Form Formula for Dispersion Characteristics of Fundamental SIW Mode

    Page(s): 4 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (422 KB) |  | HTML iconHTML  

    An accurate closed-form formula is derived from an analytical method to calculate dispersion properties of the substrate integrated waveguide (SIW). The derived equation which is a function of geometrical parameters is used to accurately estimate the cutoff frequency of the dominant mode at a low leakage condition. The unit cell of an SIW can be considered as two consecutive rectangular waveguide sections with the specific difference in their widths. The propagation constant is extracted by applying the Floquet theorem to the overall transmission matrix of the single unit cell. The proposed formula agrees well with numerical solutions as well as reported empirical equations in a wide range of structure parameters. View full abstract»

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  • A Novel Modal Technique for Time and Frequency Domain Analysis of Waveguide Components

    Page(s): 7 - 9
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (150 KB) |  | HTML iconHTML  

    A new modal algorithm for fast frequency or time domain simulation of waveguide components and resonators is proposed. The new algorithm is based on the finite difference frequency domain method combined with domain decomposition, model order reduction and the projection of fields at domain boundaries on a modal basis. As a result, one converts Maxwell's equations into a very compact set of linear equations which can be solved extremely fast, at least two orders of magnitude faster than with previous algorithms and whose coefficient matrix is independent of frequency. View full abstract»

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  • Substrate Integrated Waveguide Loaded by Complementary Split-Ring Resonators for Miniaturized Diplexer Design

    Page(s): 10 - 12
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (597 KB) |  | HTML iconHTML  

    A novel high-performance planar diplexer is developed based on the substrate integrated waveguide (SIW) with complementary split-ring resonators (CSRRs) etched on the waveguide surface. The proposed diplexer is operated below the characteristic cutoff frequency of the waveguide. The filtering response of the SIW-CSRR combined structure is investigated first. The diplexer is then implemented based on two cascaded two-pole bandpass filters. Equivalent circuit, simulated results and experimental verification are all provided. This diplexer shows advantages in terms of the compact size, low loss, high isolation, easy fabrication and integration with other circuits. View full abstract»

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  • Double Ridged 180 ^{\circ} Hybrid Power Divider With Integrated Band Pass Filter

    Page(s): 13 - 15
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    We describe the design, construction and performance of a 180° hybrid power divider with integrated band pass filter for L-band (1.3-1.8 GHz). The hybrid is based on a cavity and two novel broadband coaxial-to-double ridged waveguide transitions. The design was optimized using a commercial 3-D electromagnetic simulator. The device was tested at room and cryogenic temperature. At the physical temperature of 77 K the measured input reflection was less than -17 dB, the maximum deviation from the ideal -3 dB coupling and 180° phase difference were, respectively ±0.25 dB and ±0.9°. The experimental results are in good agreement with simulation. View full abstract»

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  • Modified Gysel Power Divider for Dual-Band Applications

    Page(s): 16 - 18
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (151 KB) |  | HTML iconHTML  

    This letter presents a modified Gysel power divider for dual-band applications. A short-stub and an open-stub has been attached to the conventional Gysel structure. Closed-form design equations are derived. Power operation analysis shows that the new dual-band circuit maintains Gysel divider's high power handling advantage over Wilkinson divider. The measured results show that good matching, isolation and power transmission can be achieved at two operating frequency bands. View full abstract»

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  • A Novel Design for a Dual-Band Negative Group Delay Circuit

    Page(s): 19 - 21
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (311 KB) |  | HTML iconHTML  

    In this letter, a novel design for a dual-band negative group delay circuit (NGDC) is proposed. Based on the topology of a single-band reflection type NGDC, composite right/left handed λ/4 short stubs are employed to obtain a negative group delay (NGD) at two separate frequency bands simultaneously. In order to achieve a bandwidth extension, the proposed structure consists of a two-stage dual-band NGDC with different center frequencies connected in a cascade. According to the measurements performed for wide-band code division multiple access and worldwide interoperability for microwave access, an NGD of -3.0 ± 0.4 ns and -3.1 ± 0.5 ns are obtained at 2.12-2.16 GHz and 3.46-3.54 GHz, respectively. View full abstract»

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  • Broadband Fixed Phase Shifters

    Page(s): 22 - 24
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (311 KB) |  | HTML iconHTML  

    A method to design planar and compact phase shifters with broadband characteristics is presented. It utilizes broadside-coupled microstrip-coplanar waveguide, and thus the proposed devices can be fabricated using the simple and cheap double-side printed circuit boards. The method is used to design 60° and 90° phase shifters. The simulated and measured results show that the developed phase shifters achieve 3 to 11 GHz bandwidth with low phase instability (±2°), very low insertion loss (0.4 dB), high return loss (15 dB), and a compact size (1.5 cm × 2 cm). View full abstract»

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  • A Compact Wideband Ring Coupler Utilizing a Pair of Transitions for Phase Inversion

    Page(s): 25 - 27
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (492 KB) |  | HTML iconHTML  

    A new wideband ring coupler utilizing a pair of ultra-wideband planar transitions is introduced in this letter. The two types of transitions (in-phase and inverted phase transitions) are coplanar waveguide-to-parallel stripline transitions, and very similarly structured except for the phase inversion part. The area of the proposed ring coupler is only 41.4% of the conventional ring coupler. The measured bandwidth of the implemented ring coupler with more than 10 dB return loss is 92.5% with the Σ port excitation, and 81.3% with the Δ port excitation. Also, due to good matched properties of the transitions, the ring coupler shows less than ± 0.7 dB amplitude mismatch, less than 4° phase difference, and more than 30 dB isolation over the operating frequencies. View full abstract»

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  • Compact UWB Bandpass Filter With Dual Notched Bands Based on SCRLH Resonator

    Page(s): 28 - 30
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (392 KB) |  | HTML iconHTML  

    This letter presents a novel ultra-wideband (UWB) band-pass filter (BPF) with dual sharply rejected notch-bands based on a simplified composite right/left-handed (SCRLH) resonator. The basic UWB BPF is comprised of four folded shunt quarter-wavelength short-circuited stubs separated by connecting lines with length of λg0/4 and λg0/2, respectively. The SCRLH resonator is studied and employed to introduce the dual notched bands. Good insertion/return losses are achieved as demonstrated in both simulation and experiment. View full abstract»

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  • A Class-F Power Amplifier With CMRC

    Page(s): 31 - 33
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (377 KB) |  | HTML iconHTML  

    This letter presents a novel harmonic control circuit (HCC) for class-F power amplifiers (PAs). A compact microstrip resonant cell (CMRC) is inserted between the transistor and the output fundamental matching network. Third harmonic open circuit condition and size reduction are achieved simultaneously. This scheme provides a straightforward and simple approach to design HCC. A class-F PA is designed and fabricated for demonstration. The measured maximum power-added efficiency (PAE) is 74% with 10 dB power gain near the 1 dB compression point. View full abstract»

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  • A 2.4 GHz Quadrature-Input Programmable Fractional Frequency Divider

    Page(s): 34 - 36
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (628 KB) |  | HTML iconHTML  

    A 2.4 GHz quadrature-input programmable frequency divider with step size of 0.5 is demonstrated in a standard 0.35 μm CMOS process. Fractional division is realized by phase switching between the cross-coupled divide-by-4 injection-locked frequency divider outputs. The proposed circuit exhibits an operation frequency range from 2.24 to 2.70 GHz and consumes less than 5.13 mW with a 1.5 V supply. View full abstract»

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  • Quadrature Injection-Locked Frequency Dividers Using Dual-Resonance Resonator

    Page(s): 37 - 39
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (443 KB) |  | HTML iconHTML  

    This letter studies the property of a divide-by-2 quadrature injection-locked frequency divider (QILFD) with dual-resonance resonator. The QILFD consists of a transformer-coupled quadrature voltage controlled oscillator and two NMOS injectors. The proposed QILFD has been implemented with the TSMC 0.18 μm CMOS technology and the core power consumption is 3.4 mW at the supply voltage of 0.75 V. At the input power of 0 dBm, the low-band and high-band divide-by-2 operation ranges are respectively from 6.3 GHz to 8.2 GHz and 8.1 GHz to 10.3 GHz. The high-frequency band tuning range of free-running QILFD can be measured after the power-on, and the low-frequency band tuning range of free-running QILFD can be measured only after the low-frequency band injection signal is injected to the QILFD. View full abstract»

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  • A 38/114 GHz Switched-Mode and Synchronous Lock Standing Wave Oscillator

    Page(s): 40 - 42
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (645 KB) |  | HTML iconHTML  

    This letter presents a 38/114 GHz switched-mode standing wave oscillator (SWO) capable of synchronous locking. Triple output frequency can be excited by digital control of different mode operations. The experimental prototype was fabricated using a low leakage 65 nm 1P9M triple-well CMOS technology. Incorporating a synchronous lock scheme, the measured phase noise from a 38 GHz carrier before and after the phase locked at 1 MHz offset are -102 dBc/Hz and -120 dBc/Hz, respectively. For the mode 1 operation at 38 GHz and mode 3 operation at 114 GHz, the experimental prototype consumes 4 and 20 mA, respectively, under a 1.2 V biasing voltage and with a chip size of 720 × 880 μm2. View full abstract»

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  • 150 GHz Complementary Anti-Parallel Diode Frequency Tripler in 130 nm CMOS

    Page(s): 43 - 45
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    The first complementary anti-parallel Schottky diode frequency tripler in CMOS is demonstrated. The tripler exhibits ~34-dB minimum conversion loss, -24-dBm maximum output power at 150 GHz, and 3 db output frequency range of ~10 GHz. View full abstract»

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  • Ultra-Wideband Power Divider Using Multi-Wafer Packaging Technology

    Page(s): 46 - 48
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (439 KB) |  | HTML iconHTML  

    A compact ultra-wideband Wilkinson power combiner/divider is first demonstrated using a hermetic multi-wafer wafer level packaging technology. Its bandwidth is broadened to around 2-22 GHz with a maximum VSWR around 2:1, by using a multi-section design approach. A total of four sections are adopted to achieve better than 20 dB isolation between output ports across the majority of a 3-19 GHz band. The first two stages are implemented on the first wafer, with the last two stages on the second wafer. This configuration significantly reduces the chip size and volume and makes the multi-section wideband divider viable for monolithic microwave integrated circuit implementation. To the authors' knowledge, this is the smallest Wilkinson power divider ever reported for such a wide bandwidth. View full abstract»

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  • Radiation Pattern Measurements of an Integrated Transverse Electromagnetic Horn Antenna Using a Terahertz Photomixing Setup

    Page(s): 49 - 51
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    We report experimental radiation pattern measurements of a transverse electromagnetic horn antenna at the millimetric/sub-millimetric frontier (280-350 GHz). The antenna is fed by a monolithically integrated uni-travelling-carrier photodiode illuminated by an optical beatnote (photomixing) at 1.55 μm. The detection is performed using an electronic sub-harmonic mixer and the whole characterization system is working at room temperature. Radiation patterns are measured in the E-plane and compared with electromagnetic simulations with a good agreement. View full abstract»

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  • Instantaneous Microwave Frequency Measurement Using a Special Fiber Bragg Grating

    Page(s): 52 - 54
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (239 KB) |  | HTML iconHTML  

    A photonic approach to realizing instantaneous microwave frequency measurement based on frequency to optical power ratio mapping using a special fiber Bragg grating (FBG) is proposed and demonstrated. The special FBG is designed to have a spectral response with two slopes that are inversely proportional to optical frequency, which enables the realization of a linear power ratio function, leading to an increased measurement range and improved measurement accuracy. The FBG is fabricated and the incorporation of the FBG in a system for frequency measurement is experimented. Instantaneous microwave frequency measurement with a measurement range of 1-10 GHz and a measurement accuracy of ±0.2 GHz under different input microwave power levels is realized. View full abstract»

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  • Advertisement - 2011 IEEE membership form

    Page(s): 55 - 56
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  • IEEE Microwave and Wireless Components Letters Reviewers List

    Page(s): C3
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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