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Microwave and Wireless Components Letters, IEEE

Issue 11 • Date Nov. 2013

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Displaying Results 1 - 23 of 23
  • 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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  • A 600 GHz Asymmetrical Orthogonal Mode Transducer

    Publication Year: 2013 , Page(s): 569 - 571
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (487 KB) |  | HTML iconHTML  

    Development of dual-polarization sensitive receivers offers significant advantages for future terahertz radiometers. The key to any such system is the orthogonal mode transducer (OMT) which separates two superimposed modes into two single-mode waveguides. This letter presents the design, fabrication and measurement of a split-block asymmetrical OMT operating from 500 to 600 GHz. View full abstract»

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  • A W-Band Low-Loss and Wideband LTCC Transition From Waveguide to Microstrip

    Publication Year: 2013 , Page(s): 572 - 574
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (589 KB) |  | HTML iconHTML  

    A broadband transition structure from rectangular waveguide (RWG) to microstrip line (MSL) is presented for the realization of the low-loss packaging module using Low-temperature co-fired ceramic (LTCC) technology at W-band. In this transition, a cavity structure is buried in LTCC layers, which provides the wide bandwidth, and a laminated waveguide (LWG) transition is designed, which provides the low-loss performance, as it reduces the radiation loss of conventional direct transition between RWG and MSL. The design procedure is also given. The measured results show that the insertion loss of better than 0.7 dB from 86 to 97 GHz can be achieved. View full abstract»

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  • Ka-Band Rectangular Waveguide to Suspended Stripline Transition

    Publication Year: 2013 , Page(s): 575 - 577
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (616 KB) |  | HTML iconHTML  

    A Ka-band transition between a rectangular waveguide and a suspended stripline (SSL) is proposed. It uses a configuration in which the SSL substrate is perpendicular to the waveguide main axis. A patch printed on the SSL substrate is used to match the characteristic impedance of the waveguide. A set of formulas to facilitate the design of the element is presented. A prototype of the transition was fabricated and the experimental results agree well with the simulations. The proposed element can have the input matching below -15 dB in a 13% bandwidth while maintaining the insertion loss below 0.22 dB. View full abstract»

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  • Novel Microstrip Fed Mechanically Tunable Combline Cavity Filter

    Publication Year: 2013 , Page(s): 578 - 580
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (661 KB) |  | HTML iconHTML  

    A novel configuration for mechanically tunable combline bandpass filters is proposed, where the classical resonating rod-tuning screw combination is replaced with a simple printed circuit-tuning screw combination. Moreover, because a printed circuit structure that uses metal vias forms the bottom part of the cavity, the coaxial type feeding and the coaxial to cavity matching of classical combline filters are also replaced with a microstrip feeding. Consequently, the proposed configuration provides smaller size, less weight, integration with other printed circuits and significant simplification in the fabrication process. A prototype filter is designed and fabricated for verification. The measured results are in good agreement with the simulation, and the filter exhibits very good harmonic suppression. View full abstract»

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  • A Cross-Guide Waveguide Directional Coupler With High Directivity and Broad Bandwidth

    Publication Year: 2013 , Page(s): 581 - 583
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (749 KB) |  | HTML iconHTML  

    A cross-guide waveguide directional coupler (patent pending) with high directivity and broad bandwidth is proposed in this letter. It consists of two rectangular waveguides (called main waveguide and branch waveguide) crossing at a certain angle and sharing a common broad wall. High directivity is achieved by adding metal inserts in the branch waveguide in the coupling region near the crossed round-ended slots. For verification purpose, a sample coupler has been designed, manufactured and measured. The measured results show that the sample coupler has a directivity greater than 28 dB over the full waveguide bandwidth. View full abstract»

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  • A Compact Dual-Band Bandpass Superconducting Filter Using Microstrip/CPW Spiral Resonators

    Publication Year: 2013 , Page(s): 584 - 586
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (457 KB) |  | HTML iconHTML  

    A compact eight-pole dual-band bandpass filter is designed using a combination of microstrip and coplanar waveguide spiral resonators. To implement a coupling matrix with both large and small elements, four coupling paths are used to apply coupling coefficients varying from 0.001 to 0.3. The fabricated superconducting filter exhibits high performance and excellent agreement with simulations. View full abstract»

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  • A Wideband Power Amplifier in 45 nm CMOS SOI Technology for X Band Applications

    Publication Year: 2013 , Page(s): 587 - 589
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (727 KB) |  | HTML iconHTML  

    A fully-integrated wideband power amplifier (PA) operating in 9-15 GHz range is implemented in a standard 45 nm CMOS SOI technology. The PA is designed with three dynamically-biased stacked Cascode cells (6 stacked transistors) to overcome the low breakdown voltages of nanoscale CMOS transistors. The stacked Cascode cells ensure stable operation and facilitate high gain, and high optimum load impedance, leading to high output power, high efficiency and good linearity characteristics over the entire bandwidth. The unbalanced amplitude and phase of drain-source voltage signals caused by internodal parasitic capacitance are equalized by adjusting the sizing of transistors. With a supply voltage of 4.8 V at 12 GHz, the measured saturated output power and linear power are 22.5 dBm and 19.2 dBm, respectively, while the peak power-added efficiency (PAE) is 19.2%. At a reduced power supply of 3.6 V, the PA achieves peak PAE of 25.7% where the drain efficiency reaches 40.7%. Including its pads, the PA occupies a compact chip area of 0.22 mm2. View full abstract»

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  • Divide-by-Three Injection-Locked Frequency Divider Combined With Divide-by-Two Locking

    Publication Year: 2013 , Page(s): 590 - 592
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (652 KB) |  | HTML iconHTML  

    A divide-by-3 direct-injection-locked frequency divider is demonstrated with an extra divide-by-2 operation by utilizing the two-fold frequency at the common-node between the drain-pumped injectors. The effective transconductance of the injectors is increased due to the existence of divide-by-two locking circuitry. The measured locking range is from 11.77 to 16.64 GHz (34.28%) with an output power of -7.25 dBm, as the core-circuit taking a power consumption of 4.2 mW from 1.2 V power supply. View full abstract»

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  • A Dual-Purpose Reconfigurable Negative Group Delay Circuit Based on Distributed Amplifiers

    Publication Year: 2013 , Page(s): 593 - 595
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (706 KB) |  | HTML iconHTML  

    In this letter, a novel reconfigurable negative group delay distributed amplifier (NGD-DA) circuit is proposed. This NGD-DA offers a new method to realize negative group delay. By properly choosing the gain coefficient of each tap for the DA, we can synthesize the negative group delay at the reverse port of the DA in the frequency band of interest, while maintaining a flat gain at the forward port; this results in a dual-purpose DA. Moreover, the proposed NGD-DA is reconfigurable; the phase response at the reverse port can be simply controlled by adjusting the tap gain coefficients, and therefore the bandwidth as well as the amount of negative group delay can be manipulated. The proposed active NGD circuit is validated through theoretical explanation and experimental results. View full abstract»

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  • 24 GHz Single-Balanced Diode Mixer Exploiting Cellulose-Based Materials

    Publication Year: 2013 , Page(s): 596 - 598
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (419 KB) |  | HTML iconHTML  

    A 24 GHz single-balanced diode mixer in paper substrate is presented. The microstrip 180 degrees hybrid junction (rat-race) is fabricated exploiting a copper adhesive tape that is shaped by a photo-lithographic process and transferred to the hosting (paper) substrate using a sacrificial layer. Only three discrete devices are necessary for the mixer operation, namely: two low-barrier, Schottky diodes and a 0 Ω resistor, used as a jumper. The measurements show a conversion loss of about 10 dB at 24 GHz with a 50 MHz IF signal. At the same frequency the isolation between LO and RF ports is better than 35 dB. The record performance achieved demonstrates, for the first time, the feasibility of K-band mixers exploiting cellulose-based materials. View full abstract»

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  • A 300 GHz Divide-by-2 ILFD Using Frequency Boosting Technique

    Publication Year: 2013 , Page(s): 599 - 601
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (748 KB) |  | HTML iconHTML  

    A 300 GHz divide-by-2 ILFD is fabricated in 40 nm CMOS technology. This ILFD adopts π-type LC networks with a negative coupling technique to enhance the oscillation frequency. The oscillation frequency and the locking range of the proposed ILFD are analyzed. The measured locking range is 297.08-306.64 GHz. The ILFD consumes 9.18 mW under a standard supply of 0.9 V excluding output buffers. View full abstract»

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  • A 2–8 GHz Wideband Dually Frequency-Tuned Ring-VCO With a Scalable {\rm K} _{\rm VCO}

    Publication Year: 2013 , Page(s): 602 - 604
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (976 KB) |  | HTML iconHTML  

    A 2-8 GHZ wideband dual-tuned ring voltage- controlled oscillator (VCO) has been designed and fabricated in TSMC 65nm CMOS process. Using a 6-bit digital-to-analog converter (DAC) that provided the V coarse, the entire frequency range was evenly divided into 64 sub-bands. Next, the oscillation frequency was finely tuned by V fine to control the strength of the latches in the delay cell of the VCO. In addition, 4-bit latch bank was used in each delay cell to ensure that the K VCO was scalable. The active silicon area was 0.038 mm2 and the power consumption was 1.7 and 6.8 mW at 2 and 8 GHz, respectively. View full abstract»

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  • Current Shared Cascade Structure for the Driver Stages of Switching Mode RF Power Amplifiers

    Publication Year: 2013 , Page(s): 605 - 607
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1054 KB) |  | HTML iconHTML  

    In this work, we propose a current shared cascade (CSC) structure for the driver stages of switching mode RF power amplifiers (PAs); this CSC is designed using a differential structure. The CSC structure is composed of a first driver stage stacked on top of a second driver stage. The first and second driver stages share a dc current and the effective supply voltages of each driver stage become approximately half the value of the supply voltage of the power stage. The CSC structure enhances the power efficiency because no additional regulator, usually required for the supply voltage of the driver stages, is necessary. We designed the PA to prove the feasibility of the proposed CSC structure. From the measured results, we successfully verify the feasibility of the proposed topology. View full abstract»

    Open Access
  • A 1.6–9.7 GHz CMOS LNA Linearized by Post Distortion Technique

    Publication Year: 2013 , Page(s): 608 - 610
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (918 KB) |  | HTML iconHTML  

    A linearized ultra-wideband (UWB) CMOS low noise amplifier (LNA) is proposed. The linearity is improved by a post distortion technique, employing PMOS as an auxiliary FET to cancel the second- and the third-order nonlinear currents of common-gate LNA. A three-section band-pass Chebyshev filter is presented for wideband input matching. The LNA implemented in a 0.18 μm CMOS technology demonstrates that IIP3 and IIP2 have about 9 and 6.9 dB improvements in broad frequency range, respectively. Power gain of 9.6-12.6 dB and noise figure (NF) of 3.9-5.8 dB are obtained in the frequency range of 1.6-9.7 GHz with a power dissipation of 10.6 mW under a 1.8 V power supply. View full abstract»

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  • A Switchless CMOS Bi-Directional Distributed Gain Amplifier With Multi-Octave Bandwidth

    Publication Year: 2013 , Page(s): 611 - 613
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (630 KB) |  | HTML iconHTML  

    This letter proposes a wideband switchless bi-directional distributed amplifier in a commercial 0.13 μm CMOS technology, which realizes multi-octave bandwidth with high gain and low noise figure using distributed amplifier technique and cascode-amplifier pair. The measured gain is over 10 dB and measured noise figure is 3.2-6.5 dB. The input and output return losses are better than 9 dB at 3-20 GHz. The measured output P1dB and OIP3 are larger than 8 dBm and 17 dBm at 4-15 GHz. The chip size is 0.96 × 0.85 mm2 including pads. The proposed switchless bi-directional amplifier has almost the same chip size compared to the conventional uni-directional distributed amplifier. The dc power consumption is around 68 mW at 1.5 V supply voltage. Nearly identical RF performances are achieved in the forward and the backward operations due to the symmetric circuit topology and layout. View full abstract»

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  • A Wideband Doherty Power Amplifier With 100 MHz Instantaneous Bandwidth for LTE-Advanced Applications

    Publication Year: 2013 , Page(s): 614 - 616
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (766 KB) |  | HTML iconHTML  

    In this letter, a 698-862 MHz wideband Doherty power amplifier (DPA) with 100 MHz instantaneous bandwidth is presented. The electrical memory effect of the wideband DPA is reduced by the LC resonant circuits employed in the drain bias networks. The influence of the integrated Doherty combiner is compensated by the broadband output matching networks, which were designed by applying the simplified real frequency technique. Driven with 100 MHz LTE-advanced signals, the adjacent channel leakage ratio (ACLR) and ACLR asymmetry of the proposed DPA at 20 MHz offset are improved by about 4 dB and 3 dB respectively, compared to the wideband DPA with conventional bias networks. After digital predistortion (DPD) linearization, the proposed DPA shows an ACLR of lower than -48 dBc at an average output power of 42.5 dBm, and high drain efficiency of over 42% across the operating frequency range. View full abstract»

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  • Reduced Cost Amplitude Independent Photonic RF Frequency Measurement System

    Publication Year: 2013 , Page(s): 617 - 619
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (484 KB) |  | HTML iconHTML  

    We have demonstrated that a previously developed amplitude independent photonic instantaneous frequency measurement (IFM) system can be further simplified by removing one laser source while maintaining the amplitude independent concept. This has reduced the cost of the system specifically when a bank of IFM systems is needed. Also, using high frequency Mach-Zehnder modulators, the system operation bandwidth was improved to 40 GHz. Although the performance of the system is not comparable to state of the art microwave receivers; the potential for system improvement exists. View full abstract»

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  • Sequential Digital Predistortion for Two-stage Envelope Tracking Power Amplifier

    Publication Year: 2013 , Page(s): 620 - 622
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (541 KB) |  | HTML iconHTML  

    To improve the efficiency of the main power amplifier, the envelope tracking technique is widely used. However, due to the reduced gain of the main amplifier by the envelope tracking, the driving power of the drive amplifier requires to be larger and the amplifier should be optimized accordingly for an efficiency operation. In this letter, a two stage envelope tracking power amplifier is studied for the purpose. The envelope tracking technique is applied to both the drive and main power amplifiers to improve efficiency of the drive amplifier, which is usually operated at a low efficiency. The experimental results show that the efficiency of the total system is improved by 2.1% while the efficiency of the drive amplifier is increased by 8%. In addition, to overcome a serious non-linearity due to the dual envelope tracking operation, a new sequential digital predistortion architecture is proposed and using this architecture, the linearity specification of the long term evolution signal has been successfully satisfied. View full abstract»

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  • High Resolution Microwave Frequency Measurement Using a Dual-Parallel Mach–Zehnder Modulator

    Publication Year: 2013 , Page(s): 623 - 625
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (621 KB) |  | HTML iconHTML  

    A novel microwave frequency measurement scheme based on a dual-parallel Mach-Zehnder modulator (DPMZM) is proposed and demonstrated. By simply adjusting the bias voltage of the DPMZM, the measurement range can be divided into several parts and each part has very high resolution. Thus, the system can be used in a two-stage instantaneous frequency measurement scheme, in which the first stage coarsely determines the frequency band of the intercepted microwave signal, and then the proposed scheme measures the frequency with high resolution. An experiment is performed. Instantaneous frequency measurement with a frequency measurement range of 2.3-18.7 GHz and a measurement resolution of ±0.20 GHz is achieved. View full abstract»

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  • A Wideband Doherty Architecture With 36% of Fractional Bandwidth

    Publication Year: 2013 , Page(s): 626 - 628
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (637 KB) |  | HTML iconHTML  

    This letter presents the design and characterization of a novel wideband Doherty architecture. Both input splitter and output combiner are realized by means of two-sections branch-line alike couplers. The realized prototype based on commercial GaN active devices shows more than 36% of fractional bandwidth, from 1.67 to 2.41 GHz. In this frequency range, the measured drain efficiency is within 59% and 43% at 6 dB of output power back-off and within 72% and 53% at saturation, with an output power around 41 dBm. More than 47% average efficiency and less than -40 dBc adjacent channel power ratio are measured applying a 20 MHz LTE digitally pre-distorted signal when the average output power is around 4 W. View full abstract»

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  • IEEE Microwave and Wireless Components Letters Reviewers List

    Publication Year: 2013 , Page(s): C3
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    Freely Available from IEEE

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