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Microwave and Wireless Components Letters, IEEE

Issue 12 • Date Dec. 2011

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Displaying Results 1 - 24 of 24
  • 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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  • Unconditionally Stable FDTD Method for Solving Oblique Incident Plane Wave on Periodic Structures

    Page(s): 637 - 639
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (157 KB) |  | HTML iconHTML  

    For solving the problem of the oblique incident plane wave over planar periodic objects, an implicit finite-difference time-domain (FDTD) method is proposed by introducing the Crank-Nicolson (CN) scheme to the field transformation technique. Unlike the previous approaches of field transformation method, this technique does not need to introduce additional field components to handle extra terms and is unconditionally stable as proved by a stability analysis. The accuracy and efficiency of the proposed method is verified by comparing with the split-field method. View full abstract»

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  • The Unconditionally Stable One-Step Leapfrog ADI-FDTD Method and Its Comparisons With Other FDTD Methods

    Page(s): 640 - 642
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (202 KB) |  | HTML iconHTML  

    One of the major hurdles that prevent the recently developed alternating-direction-implicit finite-difference time- domain (ADT-FDTD) method from being widely used is its relatively large computational expenditures due to its sub-step computations. To address the issue, a reformulation of the unconditionally stable one-step leapfrog ADI-FDTD method and its comparisons with other FDTD methods are presented in this letter. It is found that the one-step method requires less amount of memory and CPU time than the current unconditionally stable FDTD methods and the similar memory requirement and less CPU time (when the time step is chosen to be adequately large) than the conventional FDTD method. In other words, when the unconditionally stable FDTD methods are required to solve electromagnetic problems, one is strongly recommended to use the one-step leapfrog method presented. View full abstract»

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  • Dual-Band Multi-Pole Directional Filter for Microwave Multiplexing Applications

    Page(s): 643 - 645
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (530 KB) |  | HTML iconHTML  

    A novel microstrip directional filter for multiplexing applications is presented. This device uses composite right-left-handed transmission lines and resonators to achieve dual-band frequency response. In addition, by cascading two or more stages using dual frequency immitance inverters, multi-pole configurations can be obtained. Simulation and experimental results are presented with good agreement. View full abstract»

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  • Mushroom-Type Ground Plane Structure for Wideband SSN Suppression in High-Speed Circuits

    Page(s): 646 - 648
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (366 KB) |  | HTML iconHTML  

    A novel design of ground plane with mushroom-type structures is proposed for wideband suppression of simultaneous switching noise (SSN) in high-speed printed circuit boards. The mushroom-type ground plane (MGP) structure consists of two square patches which are connected to the ground plane by specially designed traces and vias. It is more compact than the mushroom-type electromagnetic bandgap (MEBG) structure where the whole middle layer is occupied by periodic patches. Simulation and measurement results show that the SSN is suppressed significantly by the MGP. A -30 dB suppression bandwidth extending from 600 MHz to 7.5 GHz is achieved by a modified MGP structure. View full abstract»

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  • Three-Way Parallel-Coupled Microstrip Power Divider With Ultrawideband Performance and Equal-Power Outputs

    Page(s): 649 - 651
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (219 KB) |  | HTML iconHTML  

    A compact equal-power three-way divider with ultrawideband performance is presented. The proposed device utilizes simple, three parallel-coupled microstrip lines. In order to enable the use of practical gaps between the tightly coupled lines, slotted ground plane and lumped capacitors, which are connected symmetrically between the two sidelines and the centerline, are utilized. The conformal mapping technique is employed to find the dimensions of the device. The simulated and measured output power, return loss, and isolation show that the proposed divider operates well across the frequency band from 4 to 11 GHz. View full abstract»

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  • A Suspended-Substrate Ku-Band Symmetric Radial Power Combiner

    Page(s): 652 - 654
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (375 KB) |  | HTML iconHTML  

    This letter presents a novel eight-way radial power combiner that exhibits wide bandwidth and very low insertion loss. The peripheral ports of this power combiner use low loss suspended substrate stripline. A cylindrical cavity is introduced as the power combining structure to obtain high combining efficiency and high power handling capability. The proposed power combining structure successfully integrates planar transmission lines with a 3-D cavity structure to realize a wide band, low loss, and compact eight-way power combiner. Measured results show a bandwidth of 3.6 GHz from 12.1 to 15.7 GHz with return loss better than 19 dB and insertion loss less than 0.17 dB, which agree very well with simulated results. View full abstract»

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  • Novel Compact Tri-Band Bandpass Filter With Controllable Bandwidths

    Page(s): 655 - 657
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (577 KB) |  | HTML iconHTML  

    Novel compact tri-band bandpass filter (BPF) with controllable bandwidths is presented in this letter. The tri-band performance is realized by using three sets of resonators, i.e., two sets of short-stub loaded dual-mode resonators, which are designed for the first and second passband, respectively, and half-wavelength resonators for the third passband. The three passband frequencies and bandwidths could be independently tuned and designed. The half-wavelength resonators are embedded between the two dual-mode resonators and serve as part of feed lines for the first and second passband, thus compact size is realized. The newly designed tri-band BPF is verified by circuit implementation and good agreement between the simulated and measured results can be observed. View full abstract»

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  • A Miniaturized Dual-Band Bandpass Filter Using Embedded Resonators

    Page(s): 658 - 660
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (611 KB) |  | HTML iconHTML  

    A compact microstrip dual-band bandpass filter (BPF) using the embedded open-loop ring resonator is proposed. The filter can achieve two passbands without using the external dual-band impedance transformer in the input/output feeding line. Furthermore, by using the developed design method, the ratio of the first passband to the second passband can be controlled. A compact microstrip dual-band BPF operated at 2.45/5.7 GHz is demonstrated. The designed filter has low insertion loss, high rejection between the two passbands, and a very small size of 11.5 × 4.65 mm2 (0.094λ0 × 0.039 λ0), λ0 being the free-space wavelength of the center operating frequency of the 2.45 GHz. The good agreement between simulation and measurement is obtained. View full abstract»

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  • Quintuple-Mode UWB Bandpass Filter With Sharp Roll-Off and Super-Wide Upper Stopband

    Page(s): 661 - 663
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (454 KB) |  | HTML iconHTML  

    This letter presents a quintuple-mode ultra-wideband (UWB) bandpass filter (BPF), using a multiple-stub-loaded resonator, consisting of multiple loaded stubs to a uniform transmission-line resonator, i.e., two asymmetrical stepped-impedance stubs at the center and four uniform-impedance stubs at the symmetrical side locations. Six modes including two odd and four even modes are controllable, while the first five modes are allocated within the UWB band. Two transmission zeros generated by the asymmetrical stepped-impedance stub are used to improve the passband selectivity greatly. The resonant mode and transmission zero chart are given, indicating that the higher modes could be suppressed by the transmission zeros generated by the stubs and the parallel-coupled lines. A compact planar UWB BPF is simulated, fabricated and measured, and the 20 dB stopband performance is extended to 29.7 GHz. View full abstract»

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  • Compact Wideband CPW Bandpass Filters With Transmission Zeros Based on Stepped Impedance Resonators (SIR)

    Page(s): 664 - 666
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (204 KB) |  | HTML iconHTML  

    Compact wideband and highly selective bandpass filters (BPFs) implemented in coplanar waveguide technology are presented. The high frequency selectivity is achieved by the presence of shunt-connected stepped impedance resonators which introduce a transmission zero at both band edges. The circuit model of the filter as well as the design procedure to synthesize the required bandwidth, based on such model, is presented. An order-3 prototype BPF with 38% fractional bandwidth, central frequency fo = 6.3 GHz and 0.03 dB bandpass ripple is designed and fabricated as proof-of-concept demonstrator. The measured filter response is in good agreement with the model predictions. Filter dimensions are as small as 0.16λ0 × 0.29λ00 , λ0 being the free-space wavelength at the central filter frequency. View full abstract»

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  • Application of Cross-Shaped Resonator to the Ultra Wideband Bandpass Filter Design

    Page(s): 667 - 669
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (252 KB) |  | HTML iconHTML  

    An ultra-wideband (UWB) bandpass filter (BPF) with two cascaded cross-shaped resonators is proposed and implemented. As the starting work of this letter, a cross-shaped resonator with wide passband is introduced. With the use of even- and odd-mode approach, this initial resonator is characterized and designed to build up a UWB BPF. And then, a cascaded UWB BPF is fabricated to satisfy Federal Communications Commission indoor mask. View full abstract»

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  • Design of a Reconfigurable Active Bandpass Filter Based on a Controllable Slope Parameter

    Page(s): 670 - 672
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (286 KB) |  | HTML iconHTML  

    This letter presents a reconfigurable active bandpass filter based on a controllable slope parameter. The proposed filter has reconfigurable bandwidths and center frequencies, and both can be continuously changed using varactor diodes as the tuning elements. The wide tuning range of the bandwidth is achieved by adjusting the slope parameter of the resonators. This letter describes the design and testing of a two-pole reconfigurable filter with tuning ranges in the center frequency of 2.0-2.6 GHz and 3 dB bandwidth of 127-598 MHz at the center frequency of 2.15 GHz. View full abstract»

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  • A Self-Tuned Balun-LNA With Differential Imbalance Correction and Blocker Filtering

    Page(s): 673 - 675
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (291 KB) |  | HTML iconHTML  

    A CMOS self-tuned low noise amplifier (LNA) with single-to-differential function is presented. A tuned LNA with high-Q band-pass filtering is reconfigured to an oscillator simply by enabling a positive feedback buffer. Using the proposed LNA, an RF filter can be self-tuned without additional tone-generator circuits, and the calibration system is greatly simplified. By adopting a differential hybrid voltage buffer, differential imbalance is minimized. For a proof-of-concept, the proposed LNA is implemented using a 0.18 μm CMOS process. The circuit operates in a tuning range of 0.8-1.5 GHz, while the error between oscillation and center frequency is less than 5%. A pass band gain of 26.7-30 dB, a noise figure (NF) of 3.9-4.3 dB, and an in/out band IIP3 of -9.9/+10.6 dBm are obtained. The LNA consumes 9 mA with 1.8 V supply. View full abstract»

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  • A 60 GHz CMOS Power Amplifier With Built-in Pre-Distortion Linearizer

    Page(s): 676 - 678
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (715 KB) |  | HTML iconHTML  

    A built-in pre-distortion linearizer using cold-mode MOSFET with forward body bias is presented for 60 GHz CMOS PA linearization on 90 nm CMOS LP process. The power amplifier (PA) achieves a Psat of 10.72 dBm and OP1 dB of 7.3 dBm from 1.2 V supply. After linearization, the OP1 dB has been doubled from 7.3 to 10.2 dBm and the operating PAE at OP1 dB consequently improves from 5.4% to 10.8%. The optimum improvement of the IMD3 is 25 dB. View full abstract»

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  • A 122 GHz Sub-Harmonic Mixer With a Modified APDP Topology for IC Integration

    Page(s): 679 - 681
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (238 KB) |  | HTML iconHTML  

    This letter presents a modified passive subharmonic mixer (SHM) topology based on an anti-parallel-diode-pair (APDP). It features a differential intermediate frequency output facilitating IC integration and improving common-mode noise rejection. An example 122 GHz SHM has been designed and tested in a 0.13 μm SiGe BiCMOS technology for a 122 GHz radar IC. SiGe HBT transistors have been diode-connected to form the APDP. The example SHM exhibits a conversion loss of 8 dB with a 5 dBm LO pumping power. The measured bandwidth extends from 117 to 124 GHz, adequately covering the 122-123 GHz ISM band, while the input 1 dB compression point and noise figure were measured to be -5 dBm and 8.5 dB respectively. Due to its superior 1/f noise performance and high linearity, the mixer is especially well suited to zero intermediate frequency radars. View full abstract»

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  • Ultrafast Low-Loss 40–70 GHz SPST Switch

    Page(s): 682 - 684
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (319 KB) |  | HTML iconHTML  

    The design and characterizations of an ultrafast single-pole single-throw (SPST) absorptive differential switch are presented. The switch exhibits low insertion loss less than 1 dB, and isolation better than 16 dB from 40 to 70 GHz. Sub-nanosecond switching time is achieved by adopting a differential current-steering technique. The total measured rise and fall time are 75 ps envisaging that switching rates up to 13 Gb/s are achievable. To our best knowledge, this is the fastest, lowest insertion loss V-band SPST switch yet reported that can operate over a wide bandwidth of 30 GHz. View full abstract»

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  • Linearization of Concurrent Dual-Band Power Amplifier Based on 2D-DPD Technique

    Page(s): 685 - 687
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (387 KB) |  | HTML iconHTML  

    This letter reports a two-dimensional digital predistortion technique to compensate for the nonlinearity of a concurrent dual band PA. Two different multi-carrier WCDMA signals with more than 1 GHz frequency spacing are concurrently employed to drive the PA and verify the linearization performance. Experimental results show that the proposed technique bounds the adjacent channel power ratio to lower than -46 dBc, which is more than 12 dB improvement for both bands concurrently. View full abstract»

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  • 4–8 GHz Near-Field Probe for Scanning of Apertures and Multimode Waveguides

    Page(s): 688 - 690
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (293 KB) |  | HTML iconHTML  

    In this letter, a high-resolution 4-to-8 GHz-matched dipole probe for near-field mapping of apertures and oversized waveguides is presented. Thanks to its high selectivity, the proposed structure is able to measure with high precision a single linear component of the E-field in the reactive near-field zone. Simulations and measurements of the reflection coefficient and of the field patterns of a horn antenna and an oversized waveguide are reported in the last section. View full abstract»

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  • A Non-Interruptive Link-Variation Monitoring Circuit for Wireless Sensor Applications

    Page(s): 691 - 693
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (716 KB) |  | HTML iconHTML  

    As wireless sensor devices are usually deployed where the operating environment changes unpredictably, the ability to evaluate the variation in the wireless link is required for reliable and efficient operations. In this paper, a novel link-variation-to-digital-converter (LDC) that provides real-time assessments on the link variations is proposed. Due to its unique structure, the proposed LDC can adjust the resolution of the output data and does not interrupt the original system functionality. A wireless power receiver prototype with a proposed circuit is implemented in CMOS 0.18 μm with an active area of 500 μm-by-20 μm. Measurements of the prototype show that link-variations due to mismatches in the resonant matching condition as well as physical misalignments can be successfully evaluated with the proposed LDC. View full abstract»

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  • Photonic Generation of Phase-Coded Millimeter-Wave Signal With Large Frequency Tunability Using a Polarization-Maintaining Fiber Bragg Grating

    Page(s): 694 - 696
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (352 KB) |  | HTML iconHTML  

    A photonic approach to generating a phase-coded millimeter-wave (mm-wave) signal with large frequency tunability is proposed and demonstrated. Two ± second-order optical sidebands are generated by using a Mach-Zehnder modulator that is biased at the maximum transmission point and an optical notch filter. A polarization-maintaining fiber Bragg grating is then utilized to make the two sidebands orthogonally polarized. By sending the two orthogonally polarized sidebands to a polarization modulator, to which a phase-coding signal is applied, a frequency-quadrupled phase-coded mm-wave signal is generated. The generation of a phase-coded mm-wave signal with tunable frequencies at 40, 42, and 50 GHz is experimentally demonstrated. A pulse compression ratio of about 128 is achieved. View full abstract»

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  • 2011 Index IEEE Microwave and Wireless Components Letters Vol. 21

    Page(s): 697 - 728
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    Freely Available from IEEE
  • IEEE Microwave and Wireless Components Letters information for authors

    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