# IEEE Transactions on Microwave Theory and Techniques

Includes the top 50 most frequently accessed documents for this publication according to the usage statistics for the month of

• ### Millimeter-Wave Technology for Automotive Radar Sensors in the 77 GHz Frequency Band

Publication Year: 2012, Page(s):845 - 860
Cited by:  Papers (205)  |  Patents (2)
| |PDF (2507 KB) | HTML

The market for driver assistance systems based on millimeter-wave radar sensor technology is gaining momentum. In the near future, the full range of newly introduced car models will be equipped with radar based systems which leads to high volume production with low cost potential. This paper provides background and an overview of the state of the art of millimeter-wave technology for automotive ra... View full abstract»

• ### Equivalent-circuit models for split-ring resonators and complementary split-ring resonators coupled to planar transmission lines

Publication Year: 2005, Page(s):1451 - 1461
Cited by:  Papers (628)  |  Patents (6)
| |PDF (1031 KB) | HTML

In this paper, a new approach for the development of planar metamaterial structures is developed. For this purpose, split-ring resonators (SRRs) and complementary split-ring resonators (CSRRs) coupled to planar transmission lines are investigated. The electromagnetic behavior of these elements, as well as their coupling to the host transmission line, are studied, and analytical equivalent-circuit ... View full abstract»

• ### Band-Switchable Substrate-Integrated Waveguide Resonator and Filter

Publication Year: 2018, Page(s):147 - 156
| |PDF (3711 KB) | HTML

In this paper, we present a new band-switchable substrate-integrated waveguide (SIW) filter structure and its design method. The filter can have a passband either in S- or X-band, or have two passbands-one in S-band and the other one in X-band-at the same time. The presented design method allows us to obtain the bandwidths of two passbands independently. To verify the presented filter structure an... View full abstract»

• ### A Flexible 2.45-GHz Power Harvesting Wristband With Net System Output From −24.3 dBm of RF Power

Publication Year: 2018, Page(s):380 - 395
| |PDF (6610 KB) | HTML

This paper presents a flexible 2.45-GHz wireless power harvesting wristband that generates a net dc output from a -24.3-dBm RF input. This is the lowest reported system sensitivity for systems comprising a rectenna and impedance-matching power management. A complete system has been implemented comprising: a fabric antenna, a rectifier on rigid substrate, a contactless electrical connection between... View full abstract»

• ### A Doherty Amplifier With Modified Load Modulation Scheme Based on Load–Pull Data

Publication Year: 2018, Page(s):227 - 236
| |PDF (3199 KB) | HTML

We present the design and development of a Ka-band Doherty power amplifier (DPA) that achieves high efficiency at power backoff (PBO) using a new load modulation scheme and a proposed load-pull-based design technique. Using the proposed technique, the device size of the peaking amplifier and the impedance of the quarter-wavelength (λ/4) inverter are properly chosen to achieve high power-add... View full abstract»

• ### A Novel Ultra-Lightweight Multiband Rectenna on Paper for RF Energy Harvesting in the Next Generation LTE Bands

Publication Year: 2018, Page(s):366 - 379
| |PDF (4458 KB) | HTML

This paper introduces a novel compact ultralightweight multiband RF energy harvester fabricated on a paper substrate. The proposed rectenna is designed to operate in all recently released LTE bands (range 0.79-0.96 GHz; 1.71-2.17 GHz; and 2.5-2.69 GHz). High compactness and ease of integration between antenna and rectifier are achieved by using a topology of nested annular slots. The proposed rect... View full abstract»

Publication Year: 2017, Page(s):4593 - 4605
| |PDF (6478 KB) | HTML

A class of frequency-reconfigurable input-reflectionless/absorptive RF/microwave filters is presented. They consist of tunable complementary-duplexer architectures that are composed of a main and an auxiliary channel with opposite filtering transfer functions. By loading the auxiliary channel with a reference-impedance resistor and by taking the output node of the main channel as the output termin... View full abstract»

• ### Highly Efficient 1.8-GHz Amplifier With 120-MHz Class-G Supply Modulation

Publication Year: 2017, Page(s):5223 - 5230
| |PDF (2667 KB) | HTML

A broadband and highly efficient class-G supply modulated power amplifier (PA) system with 120-MHz instantaneous modulation bandwidth operating in the 1.8-GHz band is presented in this paper. The core element is the fast class-G supply modulator which switches the supply voltage of the RF PA between three discrete levels with a minimum pulse duration of 2.5 ns. Two designs for the drain bias inter... View full abstract»

• ### Tunable Constant-Bandwidth Substrate-Integrated Bandstop Filters

Publication Year: 2018, Page(s):157 - 169
| |PDF (6775 KB) | HTML

A new method for designing tunable bandstop filters with constant fractional and absolute bandwidths (ABWs) is presented. The constant bandwidth is achieved through a new coupling structure, which is passive and consists only of coupling elements and transmission lines. Its theory of operation is presented, and design principles and tradeoffs are examined in detail. Several prototype filters are f... View full abstract»

• ### Microstrip-Ridge Gap Waveguide Filter Based on Cavity Resonators With Mushroom Inclusions

Publication Year: 2018, Page(s):136 - 146
| |PDF (4498 KB) | HTML

In this paper, we propose a novel microstrip-ridge gap waveguide (MS-RGW) filter configuration, which is based on cavity resonators with mushroom inclusions. The resonators are realized as defects in surrounding mushroom-based perfect magnetic conductor (PMC), and thus, the filter configuration does not require additional conductive layers nor rearrangement of the PMC elements. The hosting MS-RGW ... View full abstract»

• ### Theory of Terminated Nonlinear Transmission Lines

Publication Year: 2018, Page(s):91 - 99
| |PDF (2496 KB) | HTML

Properly terminating a transmission line, in order to transfer the maximum available power to the load, is an important issue. The problem, fully analyzed in linear lines, is still considered as a persisting problem in the area of nonlinear transmission lines (NLTLs). In this paper, an accurate analysis is presented which gives a closed-form formula for the matching efficiency of the NLTLs. Using ... View full abstract»

• ### A Simple Coaxial to Circular Waveguide OMT for Low-Power Dual-Polarized Antenna Applications

Publication Year: 2018, Page(s):109 - 115
| |PDF (3601 KB) | HTML

A simple design for an orthomode transducer (OMT) is proposed for low-power antenna applications, such as receiver antennas as well as laboratory testing antennas. The design exploits detuning pins to enable enlarging the higher order mode-free bandwidth in an asymmetric configuration without compromising the port isolation. The design guidelines are presented for a scalable design. Moreover, the ... View full abstract»

• ### 3-D Millimeter-Wave Statistical Channel Model for 5G Wireless System Design

Publication Year: 2016, Page(s):2207 - 2225
Cited by:  Papers (37)
| |PDF (4462 KB) | HTML

This paper presents a 3-D statistical channel impulse response (IR) model for urban line of sight (LOS) and non-LOS channels developed from 28- and 73-GHz ultrawideband propagation measurements in New York City, useful in the design of 5G wireless systems that will operate in both the ultra-high frequency/microwave and millimeter-wave (mmWave) spectrum to increase channel capacities. A 3GPP-like s... View full abstract»

• ### Dielectric Characterization of RF-Printed Circuit Board Materials by Microstrip Transmission Lines and Conductor-Backed Coplanar Waveguides Up to 110 GHz

Publication Year: 2018, Page(s):237 - 244
| |PDF (8100 KB) | HTML

This paper introduces a method for determining the attenuation constant and the dielectric permittivity (Dk) by microstrip lines and/or conductor-backed coplanar waveguides. The method considers several effects (surface waves, frequency-dependent conductance, inductance, and resistance) for obtaining the attenuation constant of the line and the Dk of the substrate out of measurements. For the comp... View full abstract»

• ### A Precision Wideband Quadrature Generation Technique With Feedback Control for Millimeter-Wave Communication Systems

Publication Year: 2018, Page(s):215 - 226
| |PDF (3696 KB) | HTML

An integrated two-stage polyphase filter (PPF) with feedback control for quadrature local oscillator generation at millimeter-wave frequencies is described. To minimize the in-phase (I) and quadrature (Q) mismatch, the second stage of the PPF utilizes triode-region nMOS transistors to implement variable resistors where the resistance is precisely controlled by modulating the shared gate-to-source ... View full abstract»

• ### A Wideband SiGe BiCMOS Frequency Doubler With 6.5-dBm Peak Output Power for Millimeter-Wave Signal Sources

Publication Year: 2018, Page(s):187 - 200
| |PDF (4389 KB) | HTML

This paper presents a balanced frequency doubler with 6.5-dBm peak output power at 204 GHz in 130-nm SiGe BiCMOS technology ( fT/fmax = 210/250 GHz). To convert the single-ended input signal to a differential signal for balanced operation, an on-chip transformer-based balun is employed. Detailed design procedure and compensation techniques to lower the imbalance at the output... View full abstract»

• ### A 28-GHz Low-Power Phased-Array Receiver Front-End With 360° RTPS Phase Shift Range

Publication Year: 2017, Page(s):4703 - 4714
| |PDF (4479 KB) | HTML

A low-power 28-GHz phased-array receiver (RX) front end is presented that incorporates a low-power low-noise amplifier (LNA) and a passive reflection-type phase shifter (RTPS) capable of 360° phase shift with 5-b phase resolution and low gain variation. Passive phase shifters are limited by tradeoffs between phase resolution, insertion loss, and phase shift range. The proposed RTPS load des... View full abstract»

• ### An Ultracompact 9.4–14.8-GHz Transformer-Based Fractional-N All-Digital PLL in 40-nm CMOS

Publication Year: 2017, Page(s):4241 - 4254
| |PDF (5266 KB) | HTML

In this paper, we apply various area reduction techniques on an inductor-capacitor (LC)-tank oscillator in order to make its size comparable to that of ring oscillators (ROs), while still retaining its salient features of excellent phase noise and low sensitivity to supply variations. The resulting oscillator employs a proposed ultracompact split transformer topology that provides a 1:2 passive vo... View full abstract»

• ### High-impedance electromagnetic surfaces with a forbidden frequency band

Publication Year: 1999, Page(s):2059 - 2074
Cited by:  Papers (2158)  |  Patents (145)
| |PDF (412 KB)

A new type of metallic electromagnetic structure has been developed that is characterized by having high surface impedance. Although it is made of continuous metal, and conducts dc currents, it does not conduct ac currents within a forbidden frequency band. Unlike normal conductors, this new surface does not support propagating surface waves, and its image currents are not phase reversed. The geom... View full abstract»

• ### Magnetism from conductors and enhanced nonlinear phenomena

Publication Year: 1999, Page(s):2075 - 2084
Cited by:  Papers (4575)  |  Patents (209)
| |PDF (236 KB)

We show that microstructures built from nonmagnetic conducting sheets exhibit an effective magnetic permeability μeff, which can be tuned to values not accessible in naturally occurring materials, including large imaginary components of μeff. The microstructure is on a scale much less than the wavelength of radiation, is not resolved by incident microwaves, and uses a v... View full abstract»

• ### A 173 GHz Amplifier With a 18.5 dB Power Gain in a 130 nm SiGe Process: A Systematic Design of High-Gain Amplifiers Above $f_{max }/2$

Publication Year: 2018, Page(s):201 - 214
| |PDF (7347 KB) | HTML

A novel theory of stability for two-port networks is developed. Using this theory, a new method of designing amplifiers with a high-power gain working close to the maximum frequency of oscillation (fmax) is proposed. Contrary to the existing amplifier design methodologies, in this method, the transistor capability of power amplification is fully utilized. This becomes more important at ... View full abstract»

• ### 0.2-nJ/b Fast Start-Up Ultralow Power Wireless Transmitter for IoT Applications

Publication Year: 2018, Page(s):259 - 272
| |PDF (5416 KB) | HTML

Wireless transmitters (Tx) targeting Internet-of-things (IoT) applications impose tough end-to-end efficiency requirements. The frequency synthesis problem is usually solved by incorporating a variant of the phase-locked loop. However, power-hungry dividers and large loop time constants hurt the aggregated Tx power consumption and produce systems with slow start-up and turnaround times, particular... View full abstract»

• ### Guided-wave and leakage characteristics of substrate integrated waveguide

Publication Year: 2005, Page(s):66 - 73
Cited by:  Papers (519)  |  Patents (1)
| |PDF (432 KB) | HTML

The substrate integrated waveguide (SIW) technique makes it possible that a complete circuit including planar circuitry, transitions, and rectangular waveguides are fabricated in planar form using a standard printed circuit board or other planar processing techniques. In this paper, guided wave and modes characteristics of such an SIW periodic structure are studied in detail for the first time. A ... View full abstract»

• ### Substrate-Integrated Waveguide Filters Based on Dual-Mode Air-Filled Resonant Cavities

Publication Year: 2018, Page(s):726 - 736
| |PDF (4113 KB)

This paper presents the design and implementation of a novel class of substrate-integrated waveguide (SIW) filters, based on partially air-filled cavity resonators. Removing the dielectric in a portion of the SIW cavity allows obtaining dual-mode cavities: such cavities represent a doublet, used as the building blocks in the design of filters. A thorough modal analysis of the air-filled resonant c... View full abstract»

• ### Postmatching Doherty Power Amplifier With Extended Back-Off Range Based on Self-Generated Harmonic Injection

Publication Year: 2018, Page(s):1 - 13
| |PDF (4905 KB)

In this paper, an asymmetric drain biased postmatching Doherty power amplifier (DPA) using harmonic injection is proposed for further back-off extension. The injected harmonic components are generated by the two active devices. Aided by the proposed harmonic injection network, drain waveform amplitude modulation for both devices can be achieved at saturation, which results in enhanced saturated po... View full abstract»

• ### Ultra-Broadband I/Q RF-DAC Transmitters

Publication Year: 2017, Page(s):5411 - 5421
| |PDF (5439 KB) | HTML

An ultra-broadband I/Q RF-DAC digital wireless transmitter architecture is proposed for 5G terminals and base stations. Broadband 1-32-GHz and tuned 20-32-GHz 2×6-bit versions of the transmitter were designed and manufactured in a production 45-nm SOI CMOS technology. They feature a process-and-temperature invariant quadrature phase generator with less than 1.4° phase error from 1 to... View full abstract»

• ### Performance Analysis of Reconfigurable Bandpass Filters With Continuously Tunable Center Frequency and Bandwidth

Publication Year: 2017, Page(s):4572 - 4583
| |PDF (4446 KB) | HTML

This paper presents a comparison and performance evaluation of three different technologies for the implementation of tunable filters utilizing semiconductor varactors, commercially available barium strontium titanate (BST) thin film and screen-printed BST thick-film varactors. To identify the most suitable technology for applications in low power receiving up to high-power transmitting stages, th... View full abstract»

• ### Design of Five-Way Bagley Polygon Power Dividers in Rectangular Waveguide

Publication Year: 2018, Page(s):116 - 127
| |PDF (6000 KB) | HTML

Power combiners are in general complex to manufacture and do not show a compact structure when more than two output ports are needed. To overcome these problems, the design of a five-way Bagley polygon in rectangular waveguide is presented. The proposed geometry is simple, suitable for an efficient optimization, and allows its fabrication by milling. A five-way Ku-band E-plane rectangular waveguid... View full abstract»

• ### Broadband Nonreciprocal Phase Shifter Design Technique

Publication Year: 2018, Page(s):1 - 9
| |PDF (1836 KB)

In this contribution, a novel method to design broadband nonreciprocal phase shifters (NRPS) is illustrated: this new topology is based on the combination of two directive-distributed amplifiers with a four-port phase-shifting network. The presented approach includes explicit design formulae allowing for arbitrary differential-phase implementation. Extensive design description of a 180° NRP... View full abstract»

• ### Three-dimensional millimeter-wave imaging for concealed weapon detection

Publication Year: 2001, Page(s):1581 - 1592
Cited by:  Papers (467)  |  Patents (62)
| |PDF (292 KB) | HTML

Millimeter-wave imaging techniques and systems have been developed at the Pacific Northwest National Laboratory (PNNL), Richland, WA, for the detection of concealed weapons and contraband at airports and other secure locations. These techniques were derived from microwave holography techniques that utilize phase and amplitude information recorded over a two-dimensional aperture to reconstruct a fo... View full abstract»

• ### A Review of GaN on SiC High Electron-Mobility Power Transistors and MMICs

Publication Year: 2012, Page(s):1764 - 1783
Cited by:  Papers (253)  |  Patents (5)
| |PDF (3801 KB) | HTML

Gallium-nitride power transistor (GaN HEMT) and integrated circuit technologies have matured dramatically over the last few years, and many hundreds of thousands of devices have been manufactured and fielded in applications ranging from pulsed radars and counter-IED jammers to CATV modules and fourth-generation infrastructure base-stations. GaN HEMT devices, exhibiting high power densities coupled... View full abstract»

• ### Design and Analysis of W-Band Injection-Locked Frequency Divider Using Split Transformer-Coupled Oscillator Technique

Publication Year: 2018, Page(s):177 - 186
| |PDF (2204 KB) | HTML

A W-band injection-locked frequency divider (ILFD) with low-power and wide locking range is presented in this paper. The operation frequency and locking range are enhanced by using split transformer-coupled oscillator. The optimum bias and the size of the injection transistor are chosen to achieve wider locking range without increasing chip area and dc power consumption. The proposed ILFD is imple... View full abstract»

• ### Ambient RF Energy Harvesting in Urban and Semi-Urban Environments

Publication Year: 2013, Page(s):2715 - 2726
Cited by:  Papers (214)
| |PDF (1376 KB) | HTML

RF harvesting circuits have been demonstrated for more than 50 years, but only a few have been able to harvest energy from freely available ambient (i.e., non-dedicated) RF sources. In this paper, our objectives were to realize harvester operation at typical ambient RF power levels found within urban and semi-urban environments. To explore the potential for ambient RF energy harvesting, a city-wid... View full abstract»

• ### Novel Inductive Wireless Power Transfer Uplink Utilizing Rectifier Third-Order Nonlinearity

Publication Year: 2018, Page(s):319 - 331
Cited by:  Papers (1)
| |PDF (2939 KB) | HTML

This paper proposes a new approach for inductive wireless power transfer (IWPT) tag-to-reader communication. A new technique to achieve transmitter/receiver (Tx/Rx) frequency separation is demonstrated. A two-tone Tx is adopted at the reader, and the third-order intermodulation (IM3) frequency generated by the tag rectifier nonlinearity is used as the Rx carrier, which is modulated by a baseband s... View full abstract»

• ### CMOS low-noise amplifier design optimization techniques

Publication Year: 2004, Page(s):1433 - 1442
Cited by:  Papers (323)
| |PDF (336 KB) | HTML

This paper reviews and analyzes four reported low-noise amplifier (LNA) design techniques applied to the cascode topology based on CMOS technology: classical noise matching, simultaneous noise and input matching (SNIM), power-constrained noise optimization, and power-constrained simultaneous noise and input matching (PCSNIM) techniques. Very simple and insightful sets of noise parameter expression... View full abstract»

• ### A Coupled-Line Coupling Structure for the Design of Quasi-Elliptic Bandpass Filters

Publication Year: 2018, Page(s):1 - 5
| |PDF (862 KB)

A coupled-line coupling structure is proposed for the design of quasi-elliptic bandpass filters (BPFs). The coupled-line structure functions as the input coupling structure for a BPF and introduces one pair of symmetrical transmission zeros at around the cutoff frequencies. Equivalent circuit models play an important role in the design of microwave filters. Accordingly, this paper undertakes a maj... View full abstract»

• ### Terahertz technology

Publication Year: 2002, Page(s):910 - 928
Cited by:  Papers (1510)  |  Patents (51)
| |PDF (629 KB) | HTML

Terahertz technology applications, sensors, and sources are briefly reviewed. Emphasis is placed on the less familiar components, instruments, or subsystems. Science drivers, some historical background, and future trends are also discussed View full abstract»

• ### Microwave-Induced Thermoacoustic Imaging of Subcutaneous Vasculature With Near-Field RF Excitation

Publication Year: 2018, Page(s):577 - 588
| |PDF (2781 KB) | HTML

Imaging of subcutaneous vasculature is of great interest for biometric security and point-of-care medicine. We investigate the feasibility of microwave-induced thermoacoustic (TA) tomography as a safe, compact, low-power, and cost-effective imaging technique for subcutaneous vasculature by means of application-specific design of near-field, radio frequency (RF) applicators. Using commercial transd... View full abstract»

• ### Modal Analysis and Propagation Characteristics of Leaky Waves on a 2-D Periodic Leaky-Wave Antenna

Publication Year: 2018, Page(s):1 - 11
| |PDF (1844 KB)

A 2-D periodic leaky-wave antenna is studied to examine the mechanism of beam formation from leaky-wave modes and the properties of the leaky-wave modes. The structure consists of a grounded dielectric slab with a periodic arrangement of narrow rectangular patches of metal on the upper surface of the dielectric, excited by a slot in the ground plane. The dimensions of the unit cell and the size of... View full abstract»

• ### Wireless Power Transmission: R&D Activities Within Europe

Publication Year: 2014, Page(s):1031 - 1045
Cited by:  Papers (55)
| |PDF (2882 KB) | HTML

Wireless power transmission (WPT) is an emerging technology that is gaining increased visibility in recent years. Efficient WPT circuits, systems and strategies can address a large group of applications spanning from batteryless systems, battery-free sensors, passive RF identification, near-field communications, and many others. WPT is a fundamental enabling technology of the Internet of Things co... View full abstract»

• ### A 77–81-GHz 16-Element Phased-Array Receiver With $pm {hbox{50}}^{circ}$ Beam Scanning for Advanced Automotive Radars

Publication Year: 2014, Page(s):2823 - 2832
Cited by:  Papers (38)
| |PDF (3056 KB) | HTML

A 16-element phased-array receiver has been developed for advanced W-band automotive radars. The phased-array receiver is based on a single SiGe chip with RF beamforming capabilities, which is packaged using low-cost bond-wire techniques and attached to a 16-element linear microstrip array. The antenna results in a directivity of 29.3 dB and a gain of 28.0 dB at 77-81 GHz, and can be scanned to &#... View full abstract»

• ### Compact Wideband Balanced Bandpass Filters With Very Broad Common-Mode and Differential-Mode Stopbands

Publication Year: 2018, Page(s):737 - 750
| |PDF (3144 KB)

Compact balanced bandpass filters based on a combination of multisection mirrored stepped-impedance resonators and interdigital capacitors are presented in this paper. The considered filter topology is useful to achieve wide bandwidths for the differential mode, with broad stop bands for that mode, as well as very efficient common-mode suppression. By conveniently adjusting the transmission zeros ... View full abstract»

• ### Design Methodologies of Compact Orthomode Transducers Based on Mechanism of Polarization Selectivity

Publication Year: 2018, Page(s):1 - 12
| |PDF (2439 KB)

An orthomode transducer (OMT) design is presented and implemented for future RF and millimeter-wave applications. The novelty of the proposed OMT stems from a distinct concept of handling dual-polarized signals on the basis of a polarization-selective coupler (PSC). The theory of the PSC is developed and understood through analyzing its constituent waveguides. Such waveguides are hybrid forms of n... View full abstract»

• ### Bandwidth Investigation on Half-Height Pin in Ridge Gap Waveguide

Publication Year: 2018, Page(s):100 - 108
Cited by:  Papers (1)
| |PDF (3402 KB) | HTML

Gap waveguide is a promising transmission structure, especially for millimeter-wave (mmW) and terahertz applications. It does not require conductive connection between the upper and the lower plates, which makes this technology gain advantages over conventional rectangular waveguides and substrate integrated waveguides in an mmW and terahertz regime. Different fabrication methods for gap waveguide... View full abstract»

• ### A CMOS RF-to-DC Power Converter With 86% Efficiency and -19.2-dBm Sensitivity

Publication Year: 2018, Page(s):1 - 7
| |PDF (2423 KB)

This paper proposes an RF-to-dc power converter for ambient wireless powering that is efficient, highly sensitive, and less dependent on the load resistance with an extended dynamic range. The proposed rectifier utilizes a variable biasing technique to control the conduction of the rectifying transistors selectively, hence minimizing the leakage current; unlike the prior work that has a fixed feed... View full abstract»

• ### Decorrelation-Based Concurrent Digital Predistortion With a Single Feedback Path

Publication Year: 2018, Page(s):280 - 293
| |PDF (7179 KB) | HTML

In this paper, a novel decorrelation-based concurrent digital predistortion (DPD) solution is proposed for dual-band transmitters (TXs) employing a single wideband power amplifier (PA), and utilizing only a single feedback receiver path. The proposed decorrelation-based parameter learning solution is both flexible and simple, and operates in a closed-loop manner, opposed to the widely applied indi... View full abstract»

• ### FMCW SAR System for Near-Distance Imaging Applications—Practical Considerations and Calibrations

Publication Year: 2018, Page(s):450 - 461
| |PDF (3868 KB) | HTML

A combination of frequency-modulated continuous-wave (FMCW) technology with a synthetic aperture radar (SAR) technique is a highly sought after method, which leads to a compact and cost-effective imaging system, for near-distance target imaging. One of the limiting factors of FMCW radars is that the ramp signal modulates the received signal, which limits the minimum achievable range resolution. In... View full abstract»

• ### A Compact Microstrip T-Type Switch for Narrowband Applications

Publication Year: 2018, Page(s):170 - 176
| |PDF (1617 KB) | HTML

This paper presents a compact T-type switch that involves three different operational states providing high flexibility in signal routing. Two of the states are between adjacent ports, while the other is a crossover state. T-type switches are mainly used as building blocks of redundancy matrices for satellite communications systems, although mobile applications also take advantage of switching dev... View full abstract»

• ### Model-Free Closed-Loop Stability Analysis: A Linear Functional Approach

Publication Year: 2018, Page(s):73 - 80
| |PDF (1967 KB) | HTML

Performing a stability analysis during the design of any electronic circuit is critical to guarantee its correct operation. A closed-loop stability analysis can be performed by analyzing the impedance presented by the circuit at a well-chosen node without internal access to the simulator. If any of the poles of this impedance lie in the complex right half-plane, the circuit is unstable. The classi... View full abstract»

• ### A Review on Recent Progress of Portable Short-Range Noncontact Microwave Radar Systems

Publication Year: 2017, Page(s):1692 - 1706
Cited by:  Papers (6)
| |PDF (3657 KB) | HTML

This paper reviews recent progress of portable short-range noncontact microwave radar systems for motion detection, positioning, and imaging applications. With the continuous advancements of modern semiconductor technologies and embedded computing, many functionalities that could only be achieved by bulky radar systems in the past are now integrated into portable devices with integrated circuit ch... 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..

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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