# IEEE Transactions on Microwave Theory and Techniques

## Filter Results

Displaying Results 1 - 25 of 27

Publication Year: 2012, Page(s):C1 - C4
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• ### IEEE Transactions on Microwave Theory and Techniques publication information

Publication Year: 2012, Page(s): C2
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• ### Multi-Mode Coupling Wave Theory for Helically Corrugated Waveguide

Publication Year: 2012, Page(s):1 - 7
Cited by:  Papers (58)
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Helically corrugated waveguide has been used in various applications such as gyro-backward wave oscillators, gyro-traveling wave amplifier and microwave pulse compressor. A fast prediction of the dispersion characteristic of the operating eigenwave is very important when designing a helically corrugated waveguide. In this paper, multi-mode coupling wave equations were developed based on the pertur... View full abstract»

• ### Passivity Enforcement for Admittance Models of Distributed Networks Using an Inverse Eigenvalue Method

Publication Year: 2012, Page(s):8 - 20
Cited by:  Papers (5)
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Most transient circuit simulators are based on admittance representations of the constituent circuit elements. It is therefore natural to use admittance parameter descriptions of linear networks, preferably in the form of rational transfer functions that can be directly implemented in the analysis. A problem arises when the measured or calculated frequency-domain response of a linear distributed n... View full abstract»

• ### Extended Passband Bandstop Filter Cascade With Continuous 0.85–6.6-GHz Coverage

Publication Year: 2012, Page(s):21 - 30
Cited by:  Papers (28)
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This paper presents a cascade of tunable bandstop filters with a wide spurious-free upper passband, which is completely spanned by the tuning range of the notch responses. A collection of resonators is shown to be able to provide bandstop filter responses over a 7.8 to 1 tuning range. By using spurious-free upper passband aperture-coupled cavity bandstop filters, multiple resonators, each with oct... View full abstract»

• ### Design Method for Ultra-Wideband Bandpass Filter With Wide Stopband Using Parallel-Coupled Microstrip Lines

Publication Year: 2012, Page(s):31 - 38
Cited by:  Papers (30)
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A method to design microstrip bandpass filters with ultra-wideband (UWB) performance, wide stopband, and practical dimensions is presented. According to the proposed method, three subsections of different lengths and coupling factors are connected to form a stepped-impedance parallel-coupled microstrip structure. A theoretical model is derived and used to find the optimum length and coupling facto... View full abstract»

• ### Design of a Broadband Eight-Way Coaxial Waveguide Power Combiner

Publication Year: 2012, Page(s):39 - 45
Cited by:  Papers (6)  |  Patents (1)
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In this paper, a broadband high-power eight-way coaxial waveguide power combiner with axially symmetric structure is proposed. A combination of circuit model and full electromagnetic wave methods is used to simplify the design procedure by increasing the role of the circuit model and, in contrast, reducing the amount of full wave optimization. The presented structure is compact and easy to fabrica... View full abstract»

• ### $K$ -Band CMOS Differential and Quadrature Voltage-Controlled Oscillators for Low Phase-Noise and Low-Power Applications

Publication Year: 2012, Page(s):46 - 59
Cited by:  Papers (34)
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In this paper, modified circuit topologies of a differential voltage-controlled oscillator (VCO) and a quadrature VCO (QVCO) in a standard bulk 90-nm CMOS process are presented for low dc power and low phase-noise applications. By utilizing current-reuse and transformer-feedback techniques, the proposed VCO and QVCO can be operated at reduced dc power consumption while maintaining extraordinary ci... View full abstract»

• ### Low-Voltage $K$ -Band Divide-by-3 Injection-Locked Frequency Divider With Floating-Source Differential Injector

Publication Year: 2012, Page(s):60 - 67
Cited by:  Papers (24)  |  Patents (2)
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This paper presents the design of a direct-injection divide-by-3 frequency divider operating at the K -band. The divider is implemented in a 0.18- μm CMOS process. The measured free-running frequency of the divider is 7.96 GHz. By utilizing a floating-source differential injector and without a varactor tuning in the divider core, the total locking range is 3.2 GHz with a power consum... View full abstract»

• ### Compact Wideband Linear CMOS Variable Gain Amplifier for Analog-Predistortion Power Amplifiers

Publication Year: 2012, Page(s):68 - 76
Cited by:  Papers (17)
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To predistort the signal of an analog-predistortion power amplifier system, this paper proposes a variable gain amplifier (VGA) topology that gives an optimized linearity and bandwidth performance while having a continuous, linear-in-decibel gain control curve. The design employs a self-biased differential amplifier with a dynamic current source to provide gain and linearity. The overall VGA gain ... View full abstract»

• ### A Dual-Mode CMOS RF Power Amplifier With Integrated Tunable Matching Network

Publication Year: 2012, Page(s):77 - 88
Cited by:  Papers (32)
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A dual-mode CMOS power amplifier (PA) with an integrated tunable matching network is presented. A switched capacitor is fully analyzed to implement a tunable matching network in terms of power-handling capability, tuning ratio, quality factor, and linearity. Based on the presented consideration, a 3.3-V 2.4-GHz fully integrated CMOS dual-mode PA is implemented in a 0.18-μm CMOS process. The... View full abstract»

• ### Switching Behavior of Class-E Power Amplifier and Its Operation Above Maximum Frequency

Publication Year: 2012, Page(s):89 - 98
Cited by:  Papers (13)
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The switching behavior of Class-E power amplifiers (PAs) is described. Although the zero voltage switching can be performed properly, the Cout charging process at the switch-off transition cannot be abrupt and the waveform deviates from the ideal shape, degrading the efficiency. For the operation above maximum frequency, the charging process should be even faster but it cannot fo... View full abstract»

• ### Broadband Doherty Power Amplifier via Real Frequency Technique

Publication Year: 2012, Page(s):99 - 111
Cited by:  Papers (78)  |  Patents (1)
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A comprehensive method of designing a broadband Doherty power amplifier is presented in this paper. The essential limitations of bandwidth extension of a Doherty power amplifier are discussed based on the proposed structure of the Doherty power amplifier, which also takes the output matching networks of both sub-amplifiers into account. The broadband matching is realized by applying the simplified... View full abstract»

• ### A 17–35 GHz Broadband, High Efficiency PHEMT Power Amplifier Using Synthesized Transformer Matching Technique

Publication Year: 2012, Page(s):112 - 119
Cited by:  Papers (13)
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This paper presents a 17 GHz to 35 GHz broadband power amplifier (PA) using 0.15-μm GaAs pHEMT technology. The synthesized transformer using microstrip line matching technique is proposed in this PA design to enhance the broadband frequency response and minimize the chip size. The design procedures are also presented. A high efficiency broadband PA in commercial 0.15 μm GaAs pHEMT pr... View full abstract»

• ### A 50-Mb/s CMOS QPSK/O-QPSK Transmitter Employing Injection Locking for Direct Modulation

Publication Year: 2012, Page(s):120 - 130
Cited by:  Papers (25)  |  Patents (1)
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A 50-Mb/s quadrature phase-shift keying (QPSK)/offset quadrature phase-shift keying (O-QPSK) transmitter suitable for biomedical high-quality imaging application is presented. Centered at 915 MHz, the phase modulation is achieved by directly modifying the self-resonant frequency of an LC voltage-controlled oscillator through capacitor bank switching. By eliminating many unnecessary building blocks... View full abstract»

• ### An Open-Loop Half-Quadrature Hybrid for Multiphase Signals Generation

Publication Year: 2012, Page(s):131 - 138
Cited by:  Papers (1)
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In this paper, a passive half-quadrature hybrid (HQH) is presented for multiphase signal generation at radio frequencies. Utilizing capacitance ratios as the primary design parameters, the proposed hybrid exhibits excellent magnitude and phase balance even in the presence of process and temperature variations. Therefore, it is well suited for integrated-circuit designs with on-chip capacitive elem... View full abstract»

• ### A Phased Array RFIC With Built-In Self-Test Capabilities

Publication Year: 2012, Page(s):139 - 148
Cited by:  Papers (25)
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An X-Band phased-array RF integrated circuit with built-in self-test (BIST) capabilities is presented. The BIST is accomplished using a miniature capacitive coupler at the input of each channel and an on-chip I/Q vector receiver. Systematic effects introduced with BIST system are covered in detail and are calibrated out of measurements. The BIST can be done at a rate of 1 MHz with 55 dB signal-to-... View full abstract»

• ### Fast Multiharmonic Active Load–Pull System With Waveform Measurement Capabilities

Publication Year: 2012, Page(s):149 - 157
Cited by:  Papers (16)
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A novel fast multiharmonic active load-pull system is presented, which allows for the acquisition of the complete voltage and current waveforms. The system is capable of measuring multiple different load impedance or input power states within a short time instance (typically 180 states within 20 ms). It also facilitates high-power capability (up to 100 W) and high-frequency operation (up to 50 GHz... View full abstract»

• ### Broadband Electromagnetic Modeling of Woven Fabric Composites

Publication Year: 2012, Page(s):158 - 169
Cited by:  Papers (12)
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We demonstrate a new method for predicting the broadband electromagnetic (EM) wave propagation characteristics of woven fabric composites. The method combines a rigorous EM model with effective media theory to predict the EM properties of structural composites from dc to 50 GHz. Experimental results are provided that demonstrate the validity of the method. We also describe the presence of large na... View full abstract»

• ### Low-DC Voltage-Controlled Steering-Antenna Radome Utilizing Tunable Active Metamaterial

Publication Year: 2012, Page(s):170 - 178
Cited by:  Papers (28)  |  Patents (2)
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In this paper, we experimentally realized a steering antenna using a type of active metamaterial with tunable refractive index. The metamaterial is realized by periodically printed subwavelength metallic resonant patterns with embedded microwave varactors. The effective refractive index can be controlled by low direct-current (dc) bias voltage applied to the varactors. In-phase electromagnetic wav... View full abstract»

• ### Conformal Ink-Jet Printed $C$-Band Phased-Array Antenna Incorporating Carbon Nanotube Field-Effect Transistor Based Reconfigurable True-Time Delay Lines

Publication Year: 2012, Page(s):179 - 184
Cited by:  Papers (5)
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We present a conformal ink-jet printed 2-bit four-element phased-array antenna (PAA) without any lithography process. Passive and active components, such as microstrip transmission lines, phase shifters, and RF power distribution networks are all developed adopting a room-temperature printing process. The PAA working at 5.2 GHz is printed on flexible DuPont Kapton flexible printed circuit polyimid... View full abstract»

• ### Distortion Mechanisms Originating From Modal Noise in Radio Over Multimode Fiber Links

Publication Year: 2012, Page(s):185 - 194
Cited by:  Papers (8)
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Harmonic and intermodulation distortion contributions generated by modal noise in radio over multimode fiber (RoMMF) systems for in-building wireless coverage are reviewed. The role played by the launching technique and by the optical transmitter and receiver in an intensity-modulated direct-detection RoMMF system is described theoretically and experimentally. The presented results constitute a ba... View full abstract»

• ### The Performance of a Fiber-Optic Link Using Unbiased Balanced Photodiodes for Antenna Array Calibration

Publication Year: 2012, Page(s):195 - 200
Cited by:  Papers (3)
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A quadrature-biased dual-output Mach-Zehnder modulator is used to drive unbiased balanced photodiodes for use in antenna array applications. The RF gain is measured as a function of frequency and photocurrent. Balanced photodiode two-tone measurements at 6 GHz are compared with those of a single photodiode to show 26-dB suppression of the second-order distortion. This results in a second-order lim... View full abstract»

• ### Comments on "A Compact Dual-Band 90°Coupler With Coupled-Line Sections

Publication Year: 2012, Page(s): 201
Cited by:  Papers (2)
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• ### IEEE Transactions on Microwave Theory and Techniques information for authors

Publication Year: 2012, Page(s): 202
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## Aims & Scope

The IEEE Transactions on Microwave Theory and Techniques focuses on that part of engineering and theory associated with microwave/millimeter-wave components, devices, circuits, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technical, and industrial, activities. Microwave theory and techniques relates to electromagnetic waves usually in the frequency region between a few MHz and a THz; other spectral regions and wave types are included within the scope of the Society whenever basic microwave theory and techniques can yield useful results. Generally, this occurs in the theory of wave propagation in structures with dimensions comparable to a wavelength, and in the related techniques for analysis and design..

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## Meet Our Editors

Editor-in-Chief
Luca Perregrini
luca.perregrini@unipv.it

Editor-in-Chief
Jose Carlos Pedro
edit.tmtt@ua.pt