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Microwave and Wireless Components Letters, IEEE

Issue 1 • Date Jan. 2014

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Displaying Results 1 - 25 of 27
  • Table of contents

    Publication Year: 2014 , Page(s): C1 - C4
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  • IEEE Microwave and Wireless Components Letters publication information

    Publication Year: 2014 , Page(s): C2
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  • Editorial

    Publication Year: 2014 , Page(s): 1
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  • New Microstrip Cascaded-Quadruplet Bandpass Filter Based on Connected Couplings and Short-Ended Parallel-Coupled Line

    Publication Year: 2014 , Page(s): 2 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (802 KB) |  | HTML iconHTML  

    A cascaded-quadruplet (CQ) bandpass filter (BPF) using quarter-wave resonators is proposed based on connected couplings and short-ended parallel-coupled line (SE-PCL). The two distinct coupling mechanisms are well-characterized and employed to implement the main couplings and out-of-phase cross coupling among the CQ filter topology. Analytic design formulas with great simplicity are developed. Specifically, a microstrip CQ filter centering at 1.5 GHz with a fractional bandwidth of 10% is designed and implemented for demonstration. The measured results coincide well with the simulated ones thus validate the feasibility of the design approach. View full abstract»

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  • A Simple Printed Compensated Balun for Enhanced Ultra-Wideband Performances

    Publication Year: 2014 , Page(s): 5 - 7
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (552 KB) |  | HTML iconHTML  

    This letter presents a printed compensated balun of simple structure for enhanced ultra-wideband performances. The presented design stems from the generic compensated type of Marchand balun with an optimization on selected parameters for the bandwidth enhancement. A simple planar structure based on a 3-metal-layered PCB is proposed to realize the optimal design of the circuit scheme. The proposed balun design was implemented on a standard FR4 PCB and successfully verified with consistent simulation and measurement results. The presented balun achieves ultra wideband performances with a return loss better than 10 dB from 0.45 GHz to 6.85 GHz, a bandwidth ratio of 15:1. Over the entire bandwidth, the magnitude and phase imbalances are within 0.5 dB and 10 °, respectively. To the best of our knowledge, this work performs the largest bandwidth among the printed or planar baluns reported in the literature to date. View full abstract»

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  • A 3-D Miniaturized High Selectivity Bandpass Filter in LTCC Technology

    Publication Year: 2014 , Page(s): 8 - 10
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (710 KB) |  | HTML iconHTML  

    Transmission zeros are used to improve the roll-off factors of filters but as a consequence, the out-of-band rejection decreases. In this work, an LTCC filter design is presented which employs a series inductor (implemented as a via hole) to improve the out-of-band rejection by introducing a third transmission zero. The filter, designed for GPS band (1.57 GHz), has one of the smallest reported foot prints ( (0.063×0.048×0.005)λg) and demonstrates the highest roll off factor (16.7 dB/100 MHz) for this band. With only four LTCC layers, the design is cost effective and thus highly suitable for miniaturized, ultra-thin system-on-package applications. View full abstract»

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  • Investigation of the Flip-Chip Package With BCB Underfill for W-Band Applications

    Publication Year: 2014 , Page(s): 11 - 13
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (568 KB) |  | HTML iconHTML  

    Flip-chip package has great potential for use in millimeter-wave applications. However, the coefficient of thermal expansion mismatch between the chip and the substrate usually generates thermal stresses that fracture the flip-chip structure. The use of underfills with low dielectric loss is essential to improve the mechanical strength and reliability of the flip-chip package. Benzocyclobutene (BCB) was used in this study as the underfill material for the flip-chip structure using the no-flow process. The flip-chip structure with BCB injection provides good RF performance with a return loss of better than 18 dB and an insertion loss of 0.6 dB up to 100 GHz, in addition to a lower dielectric loss. Furthermore, thermal cycle and shear force tests show that the underfill injection can significantly improve the reliability of a flip-chip package. View full abstract»

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  • Wideband Bandpass Filter Composed of Dual-Path Resonators Using Coupled-Line and Transmission Line With Inductive Elements

    Publication Year: 2014 , Page(s): 14 - 16
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (528 KB) |  | HTML iconHTML  

    A dual-path resonator for a wideband bandpass filter (bandpass filter) is proposed by using a coupled-line and a transmission line with inductive elements. It realizes a dual-mode resonance by an open-circuited interdigital coupled-line and a transmission zero near the lower cutoff frequency due to the effect of the dual-path. The wideband BPF composed of two resonators and two open-circuited stubs is also presented. The presented filter shows that steepness at both the lower and upper cutoff frequencies and high attenuation level at the stopband are obtained. Measurement result with electromagnetic simulation is observed and they are good agreement. Its bandwidth is about 1.7 GHz and the fractional bandwidth is about 44% on compact size of 22×17 mm2. View full abstract»

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  • Compact Microstrip Filtering Power Dividers With Good In-Band Isolation Performance

    Publication Year: 2014 , Page(s): 17 - 19
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (757 KB) |  | HTML iconHTML  

    Compact and high isolation microstrip filtering power dividers (PDs) have been presented in this letter. In order to effectively reduce circuit area, the compact folded net-type resonator is selected to build up the resonator-based PDs with a filtering response. The highly symmetric structure of the divider provides not only a good in-band isolation performance, but also a low magnitude imbalance and phase imbalance. For the demonstration, two design examples of in-phase and out-of-phase PDs with second-order Chebyshev filtering response have been designed and fabricated with microstrip technology. As a result, both dividers have an extremely small size of 0.19 λg by 0.19 λg. The measured results are in good agreement with the simulated predictions, showing that better than 30 dB isolation within the whole passband is achieved with a tradeoff of the bandwidth. View full abstract»

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  • Distributed Transmission Line Negative Group Delay Circuit With Improved Signal Attenuation

    Publication Year: 2014 , Page(s): 20 - 22
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (773 KB) |  | HTML iconHTML  

    In this letter, a novel design and implementation of a distributed negative group delay circuit (NGDC) with reduced signal attenuation is demonstrated. By inserting an additional transmission line Z2 into the conventional NGDC, the proposed NGDC provides further design parameters in order to obtain the required differential-phase group delay (GD) time and help to reduce the signal attenuation. As a result, the number of gain compensating amplifiers can be reduced, which can contribute to the efficiency enhancement as well as the stable operation when integrated into the RF system. Both theory and experiment are provided to validate the proposed structure. From the experiment, for the same GD time of -7.9 ns, the signal attenuation of the proposed circuit is 16.5 dB, an improvement signal attenuation of the conventional circuit of 19.2 dB. View full abstract»

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  • Novel Compact UWB Bandpass Filters Design With Cross-Coupling Between \lambda / 4 Short-Circuited Stubs

    Publication Year: 2014 , Page(s): 23 - 25
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (665 KB) |  | HTML iconHTML  

    Two novel, compact, and highly frequency selective ultra-wideband (UWB) bandpass filters (BPFs) based on an improved model are presented in this letter. The improved model contains four short-circuited stubs connected by transmission lines. A cross-coupling between the first and last short-circuited stubs is introduced to obtain new pairs of transmission zeros on both sides of the passband. The relationship between the coupling factor and the position of the transmission zeros was analyzed and good agreement was obtained between the analysis and model simulation results. Based on the model, two UWB BPFs are designed with 51% (3.1 to 5.2) GHz and 108% (3 to 10) GHz relative bandwidth and small size of 15 mm × 15 mm and 19 mm × 14 mm, respectively. The insertion loss of the (3.1 to 5.2) GHz filter is less than 0.4 dB in passband and the other one is less than 3 dB. The simulation and measurement results agree well. View full abstract»

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  • Design of Millimeter-Wave Bandpass Filter Using Electric Coupling of Substrate Integrated Waveguide (SIW)

    Publication Year: 2014 , Page(s): 26 - 28
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (629 KB) |  | HTML iconHTML  

    A millimeter-wave (mmW) bandpass filter (BPF) using substrate integrated waveguide (SIW) is proposed in this work. A BPF with three resonators is formed by etching slots on the top metal plane of the single SIW cavity. The filter is investigated with the theory of electric coupling mechanism. The design procedure and design curves of the coupling coefficient (K) and quality factor (Q) are given and discussed here. The extracted K and Q are used to determine the filter circuit dimensions. In order to prove the validity, a SIW BPF operating at 140 GHz is fabricated in a single circuit layer using low temperature co-fired ceramic (LTCC) technology. The measured insertion loss is 1.913 dB at 140 GHz with a fractional bandwidth of 13.03%. The measured results are in good agreement with simulated results in such high frequency. View full abstract»

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  • Ultrawide Bandwidth Chip-to-Chip Interconnects for III-V MMICs

    Publication Year: 2014 , Page(s): 29 - 31
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (350 KB) |  | HTML iconHTML  

    Ultrawide bandwidth coplanar waveguide interconnects between GaAs chips based on a novel fabrication process are demonstrated. Fabricated structures on 100 μm thick GaAs chips exhibited chip-to-chip insertion losses below 1 dB up to 110 GHz, and below 2.2 dB up to 220 GHz from on-wafer S-parameter measurements. A return loss larger than 10 dB from 100 MHz to 220 GHz was measured. The measured responses are consistent with numerical simulations, including the effects of excess solder at the chip-to-chip interface. Numerical simulations indicate that further improvements in performance, with insertion losses as low as 1.1 dB at 220 GHz, should be possible by minimizing the excess solder. View full abstract»

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  • A Linear Phase Filter in Quadruplet Topology With Frequency-Dependent Couplings

    Publication Year: 2014 , Page(s): 32 - 34
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB) |  | HTML iconHTML  

    This letter presents a design of a linear phase microwave bandpass filter. The filter is composed of four resonators arranged in the quadruplet topology. Making the cross and one direct coupling dispersive gives additional design flexibility. The first advantage of using frequency-dependent couplings is the possibility to chose an arbitrary location of a pair of complex transmission zeros (TZs) in the s-domain. The second one is the presence of an additional imaginary transmission zero that improves the filter selectivity. We provide a proof-of-concept design of a filter using substrate integrated waveguide (SIW) technology. The frequency-dependent couplings are implemented in SIW as a composition of both: an inductive part realized in a form of an H-plane iris and a capacitive part realized as a grounded coplanar waveguide (GCPW). The measured filter characteristics prove the validity of the model. View full abstract»

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  • Miniaturized and Large-Division-Ratio Ring Coupler Using Novel Transmission-Line Elements

    Publication Year: 2014 , Page(s): 35 - 37
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (824 KB) |  | HTML iconHTML  

    In this letter, a novel transmission-line element that is able to exhibit a high-impedance passband is proposed and applied for coupler realization with a large power division ratio. The analysis of the transmission-line element was conducted by its equivalent circuit model and the closed-form equations for the pole and zero frequencies of the effective impedance were derived to help control the passband impedance and phase responses by the lumped parameters. The high-impedance feature of the presented artificial line was exploited to experimentally develop a 12 dB ring coupler, which occupies only 29% footprint of the conventional coupler at 3.5 GHz. Experimental results are in good agreement with the simulation data. View full abstract»

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  • A Novel Dual-Band Bandpass Filter With Closely Spaced Passbands

    Publication Year: 2014 , Page(s): 38 - 40
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (666 KB) |  | HTML iconHTML  

    This letter proposes a double-slot-loaded resonator for exploration of a novel dual-band bandpass filter with two closely spaced passbands. A small ratio of dual-passband central frequencies is realized by positioning the double slot stubs in an offset way. The first-passband fractional bandwidth can be properly tuned by a distance between the two slots, while the second one is determined by attaching a microstrip open-circuited stub at center. After the principle of this initial filter is described, a prototype filter is designed and fabricated. Measured results satisfactorily validate the predicted ones of the proposed filter. View full abstract»

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  • A Bi-Phase MEMS Resonator Modulator

    Publication Year: 2014 , Page(s): 41 - 43
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (611 KB) |  | HTML iconHTML  

    The high-electric field piezoelectric properties of a PZT-transduced, two-port, acoustic resonator are utilized to create a binary phase shift modulator. The modulator operates at frequencies below 100 MHz in a length extensional mode. Typical peak modulation voltage levels are 7 V. The design is configured as a subsystem with separate RF and data ports for use in low data rate, battery-powered networks. View full abstract»

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  • Design of Low Phase-Noise Oscillator Based on a Hairpin-Shaped Resonator Using Composite Right/Left-Handed Transmission Line

    Publication Year: 2014 , Page(s): 44 - 46
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (725 KB) |  | HTML iconHTML  

    In this letter, a low phase-noise microwave oscillator based on a hairpin-shaped resonator (HSR) using a composite right/left-handed transmission line (CRLH TL) is proposed. The proposed HSR consists of the conventional transmission line (CTL) and the CRLH TL. In order to obtain the high- Q factor, an electric field is concentrated on the CRLH TL, and then the CRLH TL provides a low loss due to a slow wave effect. The proposed HSR has a very compact size of 0.105 λg ×0.19 λg. An oscillator based on the HSR was designed, fabricated and measured. At the oscillation frequency of 4.95 GHz, the measured phase noise is -120.5 dBc/Hz at 100 kHz offset with 4.93 dBm output power. View full abstract»

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  • A 0.8/2.4 GHz Tunable Active Band Pass Filter in InP/Si BiCMOS Technology

    Publication Year: 2014 , Page(s): 47 - 49
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (601 KB) |  | HTML iconHTML  

    A tunable active band pass filter (BPF) has been designed in a chip-scale heterogeneous integration technology, which intimately integrates InP HBTs on a deep scaled CMOS technology. The BPF test chip consists of a programmable gain amplifier (PGA), a BPF core, and a buffer. The chip features a frequency tuning range from 0.8 to 2.4 GHz with 150 MHz pass band and four gain steps: 0, 6, 12, and 16 dB. The BPF core employs active-RC architecture for high linearity by leveraging the >300 GHz fT of InP HBTs and the programmability of CMOS. The test chip occupies 1.7×1.25 mm2 area including pads and draws 85/110 mA from a 3.5 V power supply for 0.8/2.4 GHz bands, respectively. In addition, it demonstrates out-of-band IIP3s of 21.97/16.87 dBm for 0.8/2.4 GHz bands at the high gain mode, which suggests the BPF core delivers 37.97/32.87 dBm out-of-band IIP3s. View full abstract»

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  • Miniaturized 3-bit Phase Shifter for 60 GHz Phased-Array in 65 nm CMOS Technology

    Publication Year: 2014 , Page(s): 50 - 52
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (779 KB) |  | HTML iconHTML  

    The letter presents a compact 3-bit 90 ° phase shifter for phased-array applications at the 60 GHz ISM band (IEEE 802.11ad standard). The designed phase shifter is based on reflective-type topology using the proposed reflective loads with binary-weighted digitally-controlled varactor arrays and the transformer-type directional coupler. The measured eight output states of the implemented phase shifter in 65 nm CMOS technology, exhibit phase-resolution of 11.25 ° with an RMS phase error of 5.2 °. The insertion loss is 5.69 ± 1.22 dB at 60 GHz and the return loss is better than 12 dB over 54-66 GHz. The chip demonstrates a compact size of only 0.034 mm2. View full abstract»

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  • A Miniaturized Marchand Balun in CMOS With Improved Balance for Millimeter-Wave Applications

    Publication Year: 2014 , Page(s): 53 - 55
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (524 KB) |  | HTML iconHTML  

    The analysis and design of a millimeter-wave passive balun on silicon substrate with small size and good balance is presented. The reason for the imbalance of the balun is analyzed and a novel method using two grounded T bars beneath the coupled lines to tune the balance is proposed. The balun was fabricated in a 65 nm CMOS process, by using broadside coupled lines with small separation, the length of balun is reduced, resulting in a size of only 0.01 mm2. In the 57-67 GHz band, the measured amplitude imbalance is less than 0.5 dB and the phase imbalance is less than 1 °. This method for optimizing the imbalance of balun is efficient and it does not increase the size of balun. View full abstract»

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  • A 94 GHz, 1.4 dB Insertion Loss Single-Pole Double-Throw Switch Using Reverse-Saturated SiGe HBTs

    Publication Year: 2014 , Page(s): 56 - 58
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (561 KB) |  | HTML iconHTML  

    This work demonstrates two 94 GHz SPDT quarter-wave shunt switches using saturated SiGe HBTs. A new mode of operation, called reverse saturation, using the emitter at the RF output node of the switch, is utilized to take advantage of the higher emitter doping and improved isolation from the substrate. The switches were designed in a 180 nm SiGe BiCMOS technology featuring 90 nm SiGe HBTs (selective emitter shrink) with fT/fmax of 250/300+ GHz. The forward-saturated switch achieves an insertion loss and isolation at 94 GHz of 1.8 dB and 19.3 dB, respectively. The reverse-saturated switch achieves a similar isolation, but reduces the insertion loss to 1.4 dB. This result represents a 30% improvement in insertion loss in comparison to the best CMOS SPDT at 94 GHz. View full abstract»

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  • Mode Reconfigurable Resonators Insensitive to Alignment for Magnetic Resonance Wireless Power Transmission

    Publication Year: 2014 , Page(s): 59 - 61
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (598 KB) |  | HTML iconHTML  

    In this letter, a mode reconfigurable resonator insensitive to its alignment is proposed. The resonator is capable of maintaining a wireless power transmission (WPT) efficiency without degradation of its performance caused by misalignments. After optimum mode selection, the average WPT efficiency of 66.71% (59.02 to 71.34%) in the azimuthal plane is measured at the transmitting distance of 20 cm. The result shows that the resonator can maintain a WPT efficiency with less than 12.5% of variation. Therefore, it is expected that the resonator would be a good solution for the practical applications demanding alignment-free in mid-range and high efficiency WPT systems. View full abstract»

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  • Analysis of Loaded Substrate Integrated Waveguides and Attenuators

    Publication Year: 2014 , Page(s): 62 - 64
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (487 KB) |  | HTML iconHTML  

    This letter provides an approximate analysis of a slotted substrate integrated waveguide with periodic loading elements using the transverse resonance technique. The technique is used to design a travelling wave attenuator whereby pin diodes are capacitively coupled to the waveguide slot. By changing the bias, and therefore loading resistance, a very constant, variable attenuation is produced over the waveguide band. View full abstract»

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  • UHF Surface Dynamics Parameters Radar Design and Experiment

    Publication Year: 2014 , Page(s): 65 - 67
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (300 KB) |  | HTML iconHTML  

    This letter proposes a new ultra high frequency (UHF) radar system called UHF surface dynamics parameters radar (USDPR). The hardware has been developed based on the surface currents radar (SCR) system for an all-digital receiver platform, which realizes direct radio frequency (RF) band-pass sampling and orthogonal demodulation of the amplified echo, as compared with traditional intermediate frequency (IF) receivers. Closed-loop test and field test proves the correctness of the design. View full abstract»

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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