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# IEEE Transactions on Microwave Theory and Techniques

## Filter Results

Displaying Results 1 - 25 of 33
• ### Table of contents

Publication Year: 2009, Page(s):C1 - C4
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• ### IEEE Transactions on Microwave Theory and Techniques publication information

Publication Year: 2009, Page(s): C2
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• ### Broadband 4 $times$ 4 Butler Matrices as a Connection of Symmetrical Multisection Coupled-Line 3-dB Directional Couplers and Phase Correction Networks

Publication Year: 2009, Page(s):1 - 9
Cited by:  Papers (29)
| | PDF (832 KB) | HTML

An innovative approach for realization of broadband 4 times 4 Butler matrices, in which broadband symmetrical multisection 3-dB/90deg directional couplers are used as basic elements, has been presented. A new technique for realization of center crossover together with 45deg phase shifters is proposed where phase correction networks, consisting of a number of coupled-line sections, are applied. The... View full abstract»

• ### Third-Order Intermodulation Distortion and Harmonic Generation in Mismatched Weakly Nonlinear Transmission Lines

Publication Year: 2009, Page(s):10 - 18
Cited by:  Papers (7)
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This paper describes a procedure to obtain analytical expressions for the spurious signals generated in nonlinear transmission lines with impedance mismatch when they are subject to small-signals. Using these expressions one can rapidly extract the nonlinear parameters describing the nonlinear effects due to the conductor, L(i) and R(i) , such as in superconductors, and... View full abstract»

• ### Thermal Study of the High-Frequency Noise in GaN HEMTs

Publication Year: 2009, Page(s):19 - 26
Cited by:  Papers (24)
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The high-frequency noise performance of the GaN HEMT is studied for temperatures between 297-398 K. The access resistances RS and RD have a limiting effect on the noise performance, and in this paper, their temperature dependence is studied in detail for a 2 times 100 mum GaN HEMT. RS and RD show an increase of 0.71 and 0.86 %/K, respectively. The self-h... View full abstract»

• ### The Dynamic Behavioral Model of RF Power Amplifiers With the Modified ANFIS

Publication Year: 2009, Page(s):27 - 35
Cited by:  Papers (24)
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The adaptive neuro-fuzzy inference system (ANFIS) has been widely used for modeling different kinds of nonlinear systems including RF power amplifiers (PAs). The modified ANFIS (MANFIS) architecture is simpler than that of ANFIS, but with nearly the same performance for modeling nonlinear systems. In this paper, the MANFIS is applied to model RF PAs with memory effects. The simulation and experime... View full abstract»

• ### Microwave Sampling Beamformer—Prototype Verification and Switch Design

Publication Year: 2009, Page(s):36 - 44
Cited by:  Papers (6)
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In this study, a four-element prototype of the microwave sampling beamformer structure is constructed and tested. The prototype is composed of the microwave hardware and control hardware. A new compact switch is designed and utilized in the structure. The control circuitry is a four-branch time delay and pulsewidth control circuits along with p-i-n diode drivers. The beamforming structure is desig... View full abstract»

• ### Mode-Based Beamforming Arrays for Miniaturized Platforms

Publication Year: 2009, Page(s):45 - 52
Cited by:  Papers (27)  |  Patents (3)
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In this paper, a new and practical mode-based array concept is proposed. The key principle of this mode-based approach is the use of orthogonal radiation modes existing in highly coupled arrays as individual information channels so as to avoid mutual coupling and correlation. Consequently, mode-based arrays can be very compact in size but without suffering undesired effects such as impedance misma... View full abstract»

• ### The Matrix Balun—A Transistor-Based Module for Broadband Applications

Publication Year: 2009, Page(s):53 - 60
Cited by:  Papers (13)
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In this paper the analysis and design of a new active balun with very broadband performance, the matrix balun, are reported. Measured results show a common mode rejection ratio, CMRR, larger than 15 dB between 4 and 42 GHz while exhibiting 2 dB single-ended gain with a ripple of 1 dB. The balun was realized in a 0.15 mum GaAs mHEMT process. It occupies a chip area of 0.63 mm2 and consum... View full abstract»

• ### Design of $X$ -Band RF CMOS Transceiver for FMCW Monopulse Radar

Publication Year: 2009, Page(s):61 - 70
Cited by:  Papers (24)
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In this paper, an X-band CMOS single chip integrating 16 building blocks is developed for frequency modulation continuous wave radar application. The quadrature and monopulse transceiver consists of a voltage-controlled oscillator, amplifiers, Wilkinson power dividers, 90deg hybrid low-noise amplifiers, rat-race hybrid, a single-pole double-throw switch, an active bandpass filter (BPF), and mixers... View full abstract»

• ### Integrated LTCC Synthesizer and Signal Converter Modules at $K$ -Band

Publication Year: 2009, Page(s):71 - 79
Cited by:  Papers (5)
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We report on fully integrated K -band synthesizer and signal converter modules. The designs are realized in low-temperature co-fired ceramics, making extensively use of the multilayer features and advanced capabilities of this substrate system. The interior packaging technology exclusively utilizes flip-chip mounting of bare semiconductors. As a key element a low phase noise synthesizer is ... View full abstract»

• ### Symmetric Reverse-Coupling Waveguide Orthomode Transducer for the 3-mm Band

Publication Year: 2009, Page(s):80 - 88
Cited by:  Papers (19)
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We describe the design, construction, and performance of a waveguide orthomode transducer (OMT) for the 3-mm band (84-116 GHz). The OMT is based on a symmetric backward coupling structure and has a square waveguide input port (2.54 mm times 2.54 mm) and two single-mode waveguide outputs: a standard WR10 rectangular waveguide (2.54 mm times 1.27 mm), and an oval waveguide with full-radius corners. ... View full abstract»

• ### A 1.3-THz Balanced Waveguide HEB Mixer for the APEX Telescope

Publication Year: 2009, Page(s):89 - 98
Cited by:  Papers (46)
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In this paper, we report about the development, fabrication, and characterization of a balanced waveguide hot electron bolometer (HEB) receiver for the Atacama Pathfinder EXperiment telescope covering the frequency band of 1.25-1.39 THz. The receiver uses a quadrature balanced scheme and two HEB mixers, fabricated from 4- to 5-nm-thick NbN film deposited on crystalline quartz substrate with an MgO... View full abstract»

• ### Wideband Circulators for Use at Frequencies Above 100 GHz to Beyond 350 GHz

Publication Year: 2009, Page(s):99 - 108
Cited by:  Papers (16)
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High-performance circulators operating at frequencies in the range from 100 to 350 GHz have been developed for application in major measurement systems. These circulators have open quasi-optical structures. The magnetized plates in these devices are of nonmetallic magnetic materials which have both well-developed millimeter-wave gyrotropic properties and the magnetostatic properties of an excellen... View full abstract»

• ### Full-Wave Analysis and Design of Dielectric-Loaded Waveguide Filters Using a State-Space Integral-Equation Method

Publication Year: 2009, Page(s):109 - 120
Cited by:  Papers (5)
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A full-wave analysis method for waveguide filters based on dielectric loaded resonators is proposed in this work. For such purpose, a state-space integral-equation formulation has been developed, and the efficient numerical evaluation of all matrices and singular integrals related to the method has been detailed. The novel technique has been first validated through the accurate analysis of a diele... View full abstract»

• ### Closed-Form Solutions for the Design of Optimum Matching Networks

Publication Year: 2009, Page(s):121 - 129
Cited by:  Papers (25)
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An analytic solution of optimum matching networks up through order n = 4 is derived. Prior solutions use iterative methods. Examples are given that show direct solution of the matching network elements, and the examples also include insertion of an ideal transformer. Comments on n = 5 and 6 networks are also included. View full abstract»

• ### Analysis of Rapidly Twisted Hollow Waveguides

Publication Year: 2009, Page(s):130 - 139
Cited by:  Papers (10)
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The propagation characteristics of twisted hollow waveguides are considered, and various analysis methods are proposed. It is shown that a twisted hollow waveguide can support waves that travel at a speed slower than the speed of light c. These modes are of particular interest, as slow wave structures have many potential applications in accelerators and electron traveling wave tubes. Since ... View full abstract»

• ### Exact Synthesis of Broadband Three-Line Baluns

Publication Year: 2009, Page(s):140 - 148
Cited by:  Papers (14)
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Three types of three-line baluns are studied in this paper. The equivalent circuits of these baluns are derived using the model of coupled transmission lines. The balun designs with Chebyshev response can then be exactly synthesized. A complete design procedure of the baluns with second-, third-, and fourth-order insertion loss functions is presented. Balun designs with wide bandwidths of more tha... View full abstract»

• ### Miniaturized Dual-Band Hybrid Couplers With Arbitrary Power Division Ratios

Publication Year: 2009, Page(s):149 - 156
Cited by:  Papers (70)
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Branch-line and rat-race couplers are designed to have dual-band operation with arbitrary power division ratios. An elementary two-port is proposed to imitate the 90deg section at the two designated frequencies with different characteristic impedances. The two-port consists of a stepped-impedance section with open stubs attached to its two ends, and its circuit parameters are determined... View full abstract»

• ### Frequency-Selective Limiters Using Nonlinear Bandstop Filters

Publication Year: 2009, Page(s):157 - 164
Cited by:  Papers (9)
| | PDF (887 KB) | HTML

This paper presents a novel design for frequency-selective limiters based on reflection-mode nonlinear bandstop filters. This technique enables the use of low-Q lossy resonators for high-Q bandstop filter applications. Frequency-selective limiters described here achieve fast switching, high levels of power limiting, and flexible channel bandwidth. The prototype for a third-order devi... View full abstract»

• ### Design of Compact Tri-Band Bandpass Filters Using Assembled Resonators

Publication Year: 2009, Page(s):165 - 171
Cited by:  Papers (81)
| | PDF (601 KB) | HTML

A novel approach for designing tri-band bandpass filters with independently controllable center frequencies and improved stopband rejection characteristic is presented in this paper. The assembled resonator constructed by a stepped impedance resonator and a common half-wavelength resonator is employed to obtain tri-band response. The stepped impedance resonator is designed to operate at the first ... View full abstract»

• ### Design of Low-Temperature Co-Fired Ceramic Bandpass Filters With Modified Coupled Inductors

Publication Year: 2009, Page(s):172 - 179
Cited by:  Papers (9)
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With the assistance of modified coupled inductors, novel multilayered bandpass filters are developed in this paper. Two or three transmission zeros appear on both sides of the passband skirt easily by incorporating the proposed structures. In order to fabricate compact multilayered bandpass filters, the low-temperature co-fired ceramic technology is also employed. In addition, the equivalent circu... View full abstract»

• ### Size-Reduced Rectangular Patch Hybrid Coupler Using Patterned Ground Plane

Publication Year: 2009, Page(s):180 - 188
Cited by:  Papers (17)
| | PDF (2553 KB) | HTML

This paper presents, for the first time, the design of a size-reduced rectangular patch hybrid coupler. Different types of compact rectangular patch hybrid couplers with different ground plane patterns are described. For demonstration, two compact rectangular patch hybrid couplers are designed to operate at 3.5 GHz. They are measured to have 30.1% and 33.3% bandwidth with 67.3% and 72.3% size redu... View full abstract»

• ### Implementation of a Microstrip Square Planar $N$-Way Metamaterial Power Divider

Publication Year: 2009, Page(s):189 - 195
Cited by:  Papers (9)
| | PDF (447 KB) | HTML

This paper describes a compact square-shaped 20-way metamaterial power divider implemented in microstrip technology and lumped capacitors and inductors. The divider comprises 12 square tiles exhibiting left-handed behavior and 13 square tiles exhibiting right-handed behavior arranged in a checkerboard tessellation (or mosaic). The divider relies upon the infinite wavelength phenomena in two dimens... View full abstract»

• ### Design of Multipassband Microstrip Branch-Line Couplers With Open Stubs

Publication Year: 2009, Page(s):196 - 204
Cited by:  Papers (14)
| | PDF (1561 KB) | HTML

The microstrip branch-line coupler with multiple passbands is proposed; moreover, the design equations are provided in this paper. In order to obtain multiple passbands, open stubs are added to the conventional branch-line coupler's ports; in addition, these open stubs' impedance and electrical length need to be properly chosen. The proposed couplers can be easily fabricated on the printed circuit... View full abstract»

## 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..

Full Aims & Scope

## Meet Our Editors

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

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