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Microwave and Wireless Components Letters, IEEE

Issue 2 • Date Feb. 2013

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  • Table of contents

    Publication Year: 2013 , Page(s): C1 - C4
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  • IEEE Microwave and Wireless Components Letters publication information

    Publication Year: 2013 , Page(s): C2
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  • Accurate Computation of Poles of a Lossless Multiport Network via Cepstrum Analysis

    Publication Year: 2013 , Page(s): 57 - 59
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (606 KB) |  | HTML iconHTML  

    In this letter, we present a method to compute accurately the poles of a lossless N -port device for which the reflection and transmission(s) zeros are known. It does not require any particular symmetry of these roots and only assumes the poles are with a negative real part in the complex frequency domain. The basic concept is based on the cepstrum and allows to act on high-degree polynomials, thus being a viable option especially for the design of multiplexers. View full abstract»

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  • A Barycentric Vector Fitting Algorithm for Efficient Macromodeling of Linear Multiport Systems

    Publication Year: 2013 , Page(s): 60 - 62
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (806 KB) |  | HTML iconHTML  

    Common-pole modeling of frequency responses can be time consuming for systems with highly resonant responses. This letter presents a Barycentric Vector Fitting algorithm that improves the running time of existing Vector Fitting algorithms. The effectiveness of the approach is demonstrated by applying it to coupled microstrip lines. Numerical results confirm the accuracy of the model and the savings in computation time. View full abstract»

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  • Implementation of Low Scattering Microwave Cloaking by All-Dielectric Metamaterials

    Publication Year: 2013 , Page(s): 63 - 65
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (490 KB) |  | HTML iconHTML  

    We present a cylindrical microwave cloak, which provides low total scattering cross width (TSCW) for cloaked objects larger than the wavelength. The cloak is composed of identical dielectric resonators, while different air fractions are employed to realize the spatial dispersion of the cloak medium effective permeability required by the transformation optics relations. The cloak performance is investigated by simulating the true multi-resonator cloak structure and by experiments. The results of simulations and measurements are in good agreement and confirm the existence of the cloaking band, in which the TSCW of the cloaked target decreases below that of the bare target. View full abstract»

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  • A Modified Marchand Balun Configuration With Tunable Phase Balance

    Publication Year: 2013 , Page(s): 66 - 68
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (759 KB) |  | HTML iconHTML  

    In this letter, a novel modified Marchand balun configuration with tunable phase balance is analyzed and verified experimentally. It is proposed to add a shunt susceptance in between the two couplers of the Marchand balun. This allows for a change in the phase balance which, to first order, is linear with the susceptance, while the magnitude balance is kept constant. To verify the proposed configuration, a lumped element Marchand balun has been fabricated using a SiGe BiCMOS technology. The balun design is centered around 9.4 GHz, with an insertion loss of 6.0 dB. The phase difference between the output ports can be changed from 175.8° to 183 ° whereas the magnitude imbalance is kept almost constant at 0.3 dB. The balun performs well in the range from 7 to 11 GHz, where it is possible to tune the phase to exactly 180°. View full abstract»

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  • Wide-Stopband Bandpass Filters Using Asymmetric Stepped-Impedance Resonators

    Publication Year: 2013 , Page(s): 69 - 71
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (841 KB) |  | HTML iconHTML  

    This letter presents novel bandpass filters (BPFs) with a wide stopband using asymmetric stepped-impedance resonators (SIRs). An uncoupled section located within conventional coupled lines functions as a means of achieving additional transmission zeros between each existing zeros, created by the conventional coupled lines. Designing two types of resonators, which have the same fundamental resonant frequency f1 with different spurious harmonic resonances, results in extending the stopband bandwidth with the better suppression level. Embedded inserted feeder structure is also designed to create supplementary transmission zeros at about 9.0 and 13.0 GHz. Measured results of the proposed filter show the suppression level of -23.7 dB up to 10.6f1 with the FBW of 8.9%. View full abstract»

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  • Design of a Superconducting Ultra-Wideband (UWB) Bandpass Filter With Sharp Rejection Skirts and Miniaturized Size

    Publication Year: 2013 , Page(s): 72 - 74
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (559 KB) |  | HTML iconHTML  

    This letter presents a superconducting ultra-wideband (UWB) bandpass filter (BPF) with sharp rejection skirts and miniaturized size using multiple-mode resonator (MMR). The MMR is formed by loading a stepped-impedance open-end stub in shunt to a modified stepped-impedance resonator (SIR). The modified SIR generates three resonant modes within the 3.1-10.6 GHz UWB band, whereas the stepped-impedance open-end stub creates two transmission zeros and two additional resonant modes improving the bandedge steepness. Interdigital coupled-lines are used for the external couplings to enhance the coupling strength. A superconducting UWB BPF is realized with a compact size of 20 mm × 11 mm. The measured results without any tuning show good performance. The insertion loss at the center frequency is 0.58 dB, the return loss is greater than 10.6 dB, and the group delay variation is less than 1.76 ns. Furthermore, the experimental results of the filter are in good agreement with the simulated ones. View full abstract»

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  • Compact Diplexer Using Slotline Stepped Impedance Resonator

    Publication Year: 2013 , Page(s): 75 - 77
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (544 KB) |  | HTML iconHTML  

    In this letter, a compact diplexer is implemented by using slotline hairpin stepped impedance resonator (SIR) in ground plane. Two sets of slotline SIR with different dimensions are designed to resonate at different frequencies for the diplexer operation. Also, the SIR can provide a degree of freedom to improve the out-of-band rejection by properly tuning its geometrical parameter ratio. Besides, microstrip-slotline transition is used to split the signal to two channels without extra matching circuits and thereby economizes the circuit size. Finally, good agreement between measurement and simulation is achieved. View full abstract»

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  • Novel Balanced Bandpass Filters Using Substrate Integrated Half-Mode Waveguide

    Publication Year: 2013 , Page(s): 78 - 80
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (498 KB) |  | HTML iconHTML  

    The contribution of this work is to propose novel balanced bandpass filters (BPFs) using the half-mode substrate integrated waveguide (HMSIW) and its size-reduced form, a folded HMSIW structure. The size of an HMSIW is about half of the substrate integrated waveguide (SIW) and the size of the folded HMSIW further reduces to 25%. Besides compactness, the proposed BPFs are attractive because the thru-via array needed for providing the side-wall effect is no longer required. In addition, the common-mode (CM) rejection of the HMSIW BPF is achieved from the non-coupling slots, caused by the PMC. The CM rejection of the folded HMSIW BPF is obtained by up-shifting the CM operating frequency far away from the differential-mode (DM) passband. Prototypes of the proposed circuits are fabricated and measured to present CM rejection levels larger than 40 dB over a wide frequency range and DM insertion losses around 2 dB in the passbands. Agreements between measured and simulated data are observed to validate the circuit design and performance. View full abstract»

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  • Compact Wideband Differential Bandpass Filters Using Half-Wavelength Ring Resonator

    Publication Year: 2013 , Page(s): 81 - 83
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (607 KB) |  | HTML iconHTML  

    A new compact wideband differential bandpass filters with wideband common mode suppression using half-wavelength ring resonator is presented in this letter. Five-order passband for the wideband differential mode with two transmission zeros close to the passband is realized with four open stubs. A planar wideband differential filter (3 dB fractional bandwidth 79%) with wideband common mode suppression is designed and fabricated. The theoretical and measured results agree well and show good in-band filtering performances and high selectivity. View full abstract»

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  • Coplanar Waveguides With Nanometer Thick Gold Films

    Publication Year: 2013 , Page(s): 84 - 86
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (570 KB) |  | HTML iconHTML  

    Coplanar waveguides (CPWs) with 8 nm to 50 nm thick gold films are fabricated and characterized up to 40 GHz. Such film thicknesses are comparable with or thinner than electron mean-free-path (MFP) in gold. In this size effect regime, skin effect is negligible. The measured results show that the CPWs have less dispersion, but higher loss when compared with thick metal CPWs. A thin film resistivity model, which includes the effects of electron scatterings from metal surfaces, grain boundaries and surface roughness, is proposed to describe the microwave resistance of such CPWs. For an 8 nm CPW, it has much higher resistance and inductance given that 8 nm is around the percolation threshold of gold films. Furthermore, its inductance and resistance decrease with frequencies due to enhanced coupling among metallic islands. The quality factors of nanometer-CPWs are low, especially at low frequencies. Nevertheless, these CPWs have potential applications in local and regional interconnect, biomedical sensors, microwave nanofluidic channels, and disordered-electronic-system studies. Further work is needed to understand and accurately model nanometer CPWs. View full abstract»

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  • A Novel, Low-Voltage, Current Reused, Quadrature VCO and Divide-by-4 Frequency Divider Circuit

    Publication Year: 2013 , Page(s): 87 - 89
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1122 KB) |  | HTML iconHTML  

    A low-voltage, current-reused, quadrature voltage controlled oscillator (QVCO) and divide-by-4 frequency divider (FD4) architecture is presented for the first time. The proposed architecture features compact and low voltage operation by the proper stacking of a ring-type injection locked FD4 and a back-gate coupled QVCO. This design lowers the power consumption and eliminates the need of high frequency divider as well as buffering stage. The circuit has been implemented in 0.18-μm triple-well CMOS process. Experimental results show a phase noise level of -114.1 dBc/Hz at 1 MHz offset from carrier (2.2 GHz). This chip occupies a core area of 0.9×0.35 mm2 and consumes 2.7 mA from a 1.3 V power supply. View full abstract»

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  • Ultralow Phase Noise and Wideband CMOS VCO Using Symmetrical Body-Bias PMOS Varactors

    Publication Year: 2013 , Page(s): 90 - 92
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (480 KB) |  | HTML iconHTML  

    This letter presents an ultralow phase-noise and wide turning-range CMOS voltage-controlled oscillator (VCO) for 5 GHz WLAN applications. The proposed PMOS-only VCO design with body-bias varactors achieves a tuning range of 20.4% and a phase noise of -138.4 dBc/Hz at 1 MHz offset. The total power consumption of the VCO core is 13.1 mW using a 1.8 V supply voltage. The achieved figure of merit with tuning range (FOMT) is -207.2 for the proposed CMOS VCO. View full abstract»

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  • Offset Lines in Doherty Power Amplifiers: Analytical Demonstration and Design

    Publication Year: 2013 , Page(s): 93 - 95
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (702 KB) |  | HTML iconHTML  

    A theoretical validation of the offset lines method for design of Doherty power amplifiers is presented for the first time. The analysis is carried out considering the simplified unilateral active device model classically adopted in Doherty amplifier theory. In particular, it is proved that, in narrow band conditions, properly designed offset lines preserve the ideal load modulation across the full power sweep range. The demonstration is independent from the Doherty strategy adopted, e.g., in terms of output power back-off, even or uneven architecture. A simple analytical formula to calculate the proper length of the lines is given, and validated through a simulation example. View full abstract»

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  • A Multi-Band Quadrature Clock Generator With High-Pass-Filtered Pulse Injection Technique

    Publication Year: 2013 , Page(s): 96 - 98
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (859 KB) |  | HTML iconHTML  

    A high-pass-filtered (HPF) pulse injection technique is proposed to reduce spurs near the carrier signal due to injection locking. By using this technique, a multi-band quadrature clock generator consisting of a wide-frequency range injection-locked PLL and a frequency-selectable local buffer is demonstrated. The proposed clock generator was fabricated in a 65 nm CMOS. For a 100 MHz reference, the circuit can output 1.0, 2.0, and 4.0 GHz quadrature outputs with an eight-phase VCO and the buffer. It shows an 1 MHz-offset phase noise -105 dBc/Hz and a reference spur level of -50 dBc at 2.0 GHz, with enabling HPF pulse injection. The total power consumption is lower than 32 mW at 4 GHz. View full abstract»

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  • Optical Analog Self-Interference Cancellation Using Electro-Absorption Modulators

    Publication Year: 2013 , Page(s): 99 - 101
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (481 KB) |  | HTML iconHTML  

    An optical analog self-interference cancellation system for radio-frequency communications is proposed and experimentally demonstrated. The system uses two electro-absorption modulators, an optical attenuator and delay, and a balanced photodetector to subtract strong self-interference from a corrupted received signal and recover a weak signal of interest. The system achieves >; 65 dB narrowband cancellation and >; 30 dB broadband cancellation across more than 40 MHz bandwidth for interference in both the 900 MHz and 2.4GHz bands. Both narrowband and broadband cancellation are frequency tunable, and can be combined with other forms of interference cancellation to achieve even higher levels of cancellation. View full abstract»

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  • An Optical to Wireless Data Link Using Radio Frequency Backscatter

    Publication Year: 2013 , Page(s): 102 - 104
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (492 KB) |  | HTML iconHTML  

    The changes in the impedance of an antenna-coupled photo-detector under optical illumination are used to encode data on a backscattered wireless signal similarly to the standard techniques used for radio frequency identification and tagging. The effect is strong enough to allow retrieval of the information without requiring a dc supply at the optical to wireless interface. View full abstract»

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  • Meniscus Effect on the In Vitro Dosimetry of the T25 Flask Under 2.45 and 5.25 GHz Exposures

    Publication Year: 2013 , Page(s): 105 - 107
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (913 KB) |  | HTML iconHTML  

    A practical technique is proposed to precisely model the meniscus of the cell culture in the standard T25 flask used in bioelectromagnetic experiments on RF exposure effects. In standard exposure scenarios, the numerical calculation with the meniscus model effectively improves the accuracy of the in vitro dosimetry, as compared to results from the conventional model with a flat liquid surface. The numerical study uses the finite-difference time-domain (FDTD) method incorporated with a conformal algorithm, which is examined for accuracy against the theoretical analysis. View full abstract»

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  • Estimating the Reduction of Radiated Emissions From Microstrip Components Using Network Analyzer With a Bulk Current Injection Probe

    Publication Year: 2013 , Page(s): 108 - 110
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (470 KB) |  | HTML iconHTML  

    This work presents a novel measurement method using a network analyzer with a bulk current injection (BCI) probe to measure the common-mode conversion coefficient of microstrip components in an RF/microwave circuit. Based on the proposed measurement method, far-field radiated emissions from microstrip components are obtained, which closely corresponds to measurements in a fully anechoic chamber. The proposed method also estimates the radiated emission reduction by miniaturizing the physical size of microstrip bandpass filters (BPFs). Full-wave electromagnetic simulation further demonstrates the effectiveness of the measurement method. View full abstract»

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  • Open Access

    Publication Year: 2013 , Page(s): 111
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    Freely Available from IEEE
  • IEEE Xplore Digital Library

    Publication Year: 2013 , Page(s): 112
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    Freely Available from IEEE
  • IEEE Microwave and Wireless Components Letters information for authors

    Publication Year: 2013 , 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