# IEEE Microwave and Wireless Components Letters

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• ### Filtering Power Divider With Good Isolation Performance and Harmonic Suppression

Publication Year: 2016, Page(s):984 - 986
Cited by:  Papers (1)
| | PDF (1137 KB) | HTML

A microstrip filtering power divider (FPD) with good isolation performance and harmonic suppression is presented. By replacing a simple resistor with a novel distributed stepped-impedance resonator network, better isolation and wider stopband are simultaneously attained. A transmission matrix-based analysis method is then extensively described to determine the circuit geometrical parameters at the... View full abstract»

• ### Simulation and experiment on SIW slot array antennas

Publication Year: 2004, Page(s):446 - 448
Cited by:  Papers (283)  |  Patents (3)
| | PDF (368 KB) | HTML

By etching longitudinal slots on the top metallic surface of the substrate integrated waveguide (SIW), an integrated slot-array antenna is proposed in this letter. The whole antenna and feeding system are fabricated on a single substrate, which takes the advantage of small size, low profile, and low cost, etc. The design process and experimental results of a four-by-four SIW slot array antenna at ... View full abstract»

• ### Novel 1.5-1.9 GHz Tunable Single-to-Balanced Bandpass Filter With Constant Bandwidth

Publication Year: 2016, Page(s):972 - 974
| | PDF (948 KB) | HTML

A novel tunable single-to-balanced bandpass filter is proposed in this letter. It consists of pairs of stepped-impedance resonators (SIRs), which are connected by back-to-back varactors in between. Based on such a simple structure, the filter can cover from 1.5 GHz to 1.9 GHz with constant absolute bandwidth, and exhibit differential outputs in each tuning state. The amplitude and phase imbalances... View full abstract»

Publication Year: 2016, Page(s):981 - 983
Cited by:  Papers (1)
| | PDF (914 KB) | HTML

This article reports on a simple yet efficient miniaturization technique of substrate integrated waveguide cavity resonators through stub loading. The stubs are attached to the cavity side edges and they are coupled with the magnetic fields of the cavity. This setup allows the stub loaded cavity to operate below its fundamental resonant frequency. This miniaturization technique is demonstrated by ... View full abstract»

• ### Microstrip T-Junction Power Divider With Exponentially Tapered Transmission Lines

Publication Year: 2016, Page(s):987 - 989
Cited by:  Papers (2)
| | PDF (776 KB) | HTML

A method is provided for calculating the port parameters of an exponentially tapered power divider. Derived from the general solution for the input impedance of an exponentially tapered line, a design methodology for power dividing ratios from 2-10 dB is shown. An analytic formula for the power dividing ratio is expressed in terms of input impedances of the T-junction. Two devices are fabricated a... View full abstract»

• ### Low-Cost Surrogate Models for Microwave Filters

Publication Year: 2016, Page(s):969 - 971
| | PDF (378 KB) | HTML

A novel low-cost kriging-based multivariable parametric macromodeling technique for microwave filters is presented. Kriging is used to model both the residues and poles of a microwave filter's reflection coefficient, and the zeros of the transmission coefficient. The proposed residue-pole-zero (RPZ) technique is demonstrated to efficiently model a high dimensional (8D) microwave filter with pseudo... View full abstract»

• ### Miniaturized Substrate Integrated Waveguide (SIW) Power Dividers

Publication Year: 2016, Page(s):888 - 890
Cited by:  Papers (1)
| | PDF (1277 KB) | HTML

In this letter, compact substrate integrated waveguide (SIW) power dividers are presented. Both equal and unequal power divisions are considered. A quarter-wavelength long wedge shape SIW structure is used for the power division. Direct coaxial feed is used for the input port and SIW-tomicrostrip transitions are used for the output ports. Four-way equal, unequal and an eight-way equal division pow... View full abstract»

• ### An Asymmetric 2.4 GHz Directional Coupler Using Electrical Balance

Publication Year: 2016, Page(s):990 - 992
| | PDF (870 KB) | HTML

The concept of electrical balance is used to achieve wideband isolation in an asymmetric 2.4 GHz directional coupler. An intuitive approach using impedance transformation property of transmission lines is used to develop the theory for designing arbitrary-coupling-ratio directional couplers. A coupler based on this theory is designed and fabricated on a two-layered RO4003C PCB. The coupler achieve... View full abstract»

• ### Compact Hexagonal Shape Elliptical Low Pass Filter With Wide Stop Band

Publication Year: 2016, Page(s):978 - 980
Cited by:  Papers (3)
| | PDF (1110 KB) | HTML

In this work a new hexagonal shape compact elliptical low pass filter (LPF) is introduced. To improve and extend the stop band, two additional transmission zeros are created by introducing three semi-circular slots in the ground plane. Insertion loss is <;0.85dB in the range of 0-1.5 GHz within the pass band and return loss is >18 dB in the entire pass band. Rejection band is extended up to ... View full abstract»

• ### A Quintuple-mode Wideband Bandpass Filter on Single Metallic Cavity With Perturbation Cylinders

Publication Year: 2016, Page(s):975 - 977
Cited by:  Papers (2)
| | PDF (657 KB) | HTML

A quintuple-mode wideband bandpass filter (BPF) on a single circular waveguide cavity with perturbation-oriented cylinders is proposed. These five resonant modes are the fundamental TM01 mode, a pair of TM11 degenerate modes, and a pair of TE11 degenerate modes. Three metallic cylinders are installed on the bottom of an intra-cavity to excite TM modes, and two coax... View full abstract»

• ### Compact 6.5-28.5 GHz On-Chip Balun With Enhanced Inband Balance Responses

Publication Year: 2016, Page(s):993 - 995
| | PDF (990 KB) | HTML

In this letter, a miniaturized on-chip stacked-spiral-coupled (SSC) Marchand balun is proposed with wideband operation, i.e., fractional bandwidth (FBW) >125%. To improve the inband balance responses (i.e., amplitude- and phase-balances), the self-coupled compensation line and center-tapped ground-shield with deep trench are introduced. To verify the mechanism of structures mentioned above, a b... View full abstract»

• ### Dual-Band Bandpass Filters Using Stub-Loaded Resonators

Publication Year: 2007, Page(s):583 - 585
Cited by:  Papers (281)
| | PDF (179 KB) | HTML

Dual-band bandpass filters using novel stub-loaded resonators (SLRs) are presented in this letter. Characterized by both theoretical analysis and full-wave simulation, the proposed SLR is found to have the advantage that the even-mode resonant frequencies can be flexibly controlled whereas the odd-mode resonant frequencies are fixed. Based on the proposed SLR, a dual-band filter is implemented wit... View full abstract»

• ### Ultra-wideband (UWB) bandpass filters using multiple-mode resonator

Publication Year: 2005, Page(s):796 - 798
Cited by:  Papers (595)
| | PDF (232 KB) | HTML

A novel microstrip-line ultra-wideband (UWB) bandpass filter is proposed and implemented using a multiple-mode resonator (MMR), aiming at transmitting the signals in the whole UWB passband of 3.1-10.6GHz. In the design, the first three resonant frequencies of this MMR are properly adjusted to be placed quasiequally within the UWB. Then, the parallel-coupled lines at the two sides are longitudinall... View full abstract»

• ### A Compact Mixer-First Receiver With >24 dB Self-Interference Cancellation for Full-Duplex Radios

Publication Year: 2016, Page(s):1005 - 1007
| | PDF (1197 KB) | HTML

This letter presents a single-channel full-duplex receiver with tunable self-interference (SI) cancelling capability through LO phase shifting. The receiver takes advantage of high linearity of the passive mixer-first architecture to eliminate SI without degrading sensitivity due to inter-modulation distortion. The proposed receiver exhibits a DSB noise figure of 8.6-12.5 dB over an operating freq... View full abstract»

• ### Compact Balanced Dual-Band Bandpass Filter Based on Modified Coupled-Embedded Resonators

Publication Year: 2017, Page(s):31 - 33
Cited by:  Papers (1)
| | PDF (804 KB) | HTML

A new compact balanced dual-band bandpass filter based on coupled-embedded resonators with modified ground plane is presented in this work. Common-mode is rejected within the two differential passbands by symmetrically introducing four coupled U-shaped defected ground structures below the resonators. Common-mode rejection is significantly improved when compared with the standard (solid ground plan... View full abstract»

• ### A High Efficiency and Low Distortion 6 W GaN MMIC Doherty Amplifier for 7 GHz Radio Links

Publication Year: 2017, Page(s):70 - 72
Cited by:  Papers (1)
| | PDF (681 KB) | HTML

This contribution presents a novel design methodology for Gallium Nitride (GaN) Monolithic Microwave Integrated Circuit (MMIC) Doherty Power Amplifiers (DPAs). The proposed solution allows to mitigate the relevant phase distortion (AM/PM) and gain penalty, typically registered in GaN DPAs, without worsening other key features such as back-off efficiency and amplitude distortion (AM/AM). To this pu... View full abstract»

• ### Integrated microstrip and rectangular waveguide in planar form

Publication Year: 2001, Page(s):68 - 70
Cited by:  Papers (797)  |  Patents (16)
| | PDF (57 KB)

Usually transitions from microstrip line to rectangular waveguide are made with three-dimensional complex mounting structures. In this paper, a new planar platform is developed in which the microstrip line and rectangular waveguide are fully integrated on the same substrate, and they are interconnected via a simple taper. Our experiments at 28 GHz show that an effective bandwidth of 12% at 20 dB r... View full abstract»

• ### Fully-Integrated Two-Stage GaN MMIC Doherty Power Amplifier for LTE Small Cells

Publication Year: 2016, Page(s):918 - 920
Cited by:  Papers (3)
| | PDF (1270 KB) | HTML

A novel two-stage Doherty power amplifier (PA) was designed and fully integrated on a 0.25-μm GaN on SiC monolithic microwave integrated circuit die with a dimension of 3.3 × 2.6 mm2 to build small-cell base stations. An asymmetric Doherty configuration was adopted for the power stage with the reversed uneven input power splitting network for better performance. To improve... View full abstract»

• ### Analysis and Implementation of an Ultra-Wide Tuning Range CMOS Ring-VCO With Inductor Peaking

Publication Year: 2017, Page(s):49 - 51
Cited by:  Papers (1)
| | PDF (1470 KB) | HTML

A novel ring voltage controlled oscillator (VCO) topology is proposed which uses monolithic inductors as a peaking load. Four design examples have been fabricated and tested to verify the proposed circuit structure. The highest measured oscillation frequency is 25.07 GHz, with a tuning range of more than four octaves, and the active area is 0.0085 mm2. The design has the highest combine... View full abstract»

• ### D–Band RF–MEMS SPDT Switch in a $0.13~\mu$ m SiGe BiCMOS Technology

Publication Year: 2016, Page(s):1002 - 1004
Cited by:  Papers (1)
| | PDF (727 KB) | HTML

This letter presents a D-Band (110-170 GHz) RF-MEMS based Single-Pole Double-Throw (SPDT) switch fabricated in a 0.13 μm SiGe BiCMOS technology. The on-wafer S-parameter measurements of the RF-MEMS based SPDT switch show beyond state of the art RF performances, 1.42 dB insertion loss and 54.5 dB isolation at 140 GHz. The SPDT switch consists of a tee junction connected to two Single-Pole Si... View full abstract»

• ### Wideband Fully Tunable Bandpass Filter Based on Flexibly Multi-Mode Tuning

Publication Year: 2016, Page(s):789 - 791
Cited by:  Papers (1)
| | PDF (793 KB) | HTML

In this letter, a wideband fully tunable bandpass filter with three adjustable transmission poles is proposed. The fundamental structure consists of two half-wave length (λ/2) resonators with center-tapped open and shorted stubs. Due to the same odd-mode resonant frequency, these two dual-mode resonators can form a wideband bandpass filter with three poles. Further, the fully tunable filter... View full abstract»

• ### Multilayer Substrate Integrated Waveguide (SIW) Filters With Higher-Order Mode Suppression

Publication Year: 2016, Page(s):678 - 680
Cited by:  Papers (3)
| | PDF (590 KB) | HTML

This letter presents a multilayer approach for suppressing the higher order modes of substrate integrated waveguide (SIW) bandpass filters. Rectangular SIW resonators in multilayer substrates can be vertically coupled with magnetic and/or electric coupling by the proposed apertures etched on the middle metal layer. Harmonic passbands produced by the first higher-order mode TE102 can be ... View full abstract»

• ### Effective negative-ϵ stopband microstrip lines based on complementary split ring resonators

Publication Year: 2004, Page(s):280 - 282
Cited by:  Papers (433)  |  Patents (1)
| | PDF (128 KB) | HTML

In this letter a super-compact stopband microstrip structure is proposed. The frequency gap is produced by an array of complementary split ring resonators (CSRRs)-a concept proposed here for the first time-etched on the ground plane. This behavior is interpreted as due to the presence of a negative effective dielectric permittivity in the vicinity of resonance. The resulting device produces a deep... View full abstract»

• ### Single- and Dual-Band Bandpass Filters Using Coupled Stepped-Impedance Resonators With Embedded Coupled-Lines

Publication Year: 2016, Page(s):675 - 677
Cited by:  Papers (5)
| | PDF (826 KB) | HTML

A pair of coupled stepped-impedance resonators and its use to build single- and dual-band bandpass filter (BPF) is presented. To that end, two symmetrical stepped-impedance resonators with two embedded coupled-line sections are used. The adopted resonators are coupled at the two open-ended edges. The first even-mode resonant mode can be suppressed or excited based on whether it is required to real... View full abstract»

• ### Tunable Center Frequency Negative Group Delay Filter Using Coupling Matrix Approach

Publication Year: 2017, Page(s):37 - 39
| | PDF (807 KB) | HTML

In this letter, a negative group delay filter (NGDF) with tunable center frequencies is presented. The proposed filter is designed using finite unloaded-Qu resonators based on the coupling matrix approach. The proposed NGDF does not require a lumped resistor to generate a negative group delay and has source-load and inter-resonator couplings. The center frequency of the filter is tuned ... View full abstract»

• ### Improved Doherty Amplifier Design with Minimum Phase Delay in Output Matching Network for Wideband Application

Publication Year: 2016, Page(s):915 - 917
Cited by:  Papers (1)
| | PDF (1238 KB) | HTML

This letter presents an improved Doherty power amplifier (DPA) for high-efficiency and wideband operations. To achieve the impedance transformations both in the low power region and at saturation, a design approach is proposed to determine the desired minimum phase delays of the carrier and peaking output matching networks, which can simplify the load modulation network of the DPA and extend the b... View full abstract»

• ### A V-Band Current-Reused LNA With a Double-Transformer-Coupling Technique

Publication Year: 2016, Page(s):942 - 944
Cited by:  Papers (1)
| | PDF (911 KB) | HTML

This letter presents a current-reused V-band low-noise amplifier (LNA) with a double-transformer-coupling technique in 65nm CMOS technology. A couple of common-source (CS) stages are stacked to share current, and the double transformers are used as an RF signal path between the CS stages for both gain and stability considerations. The LNA has three CS-CS stages, and achieves a peak gain of 31.4 dB... View full abstract»

• ### Dispersion characteristics of substrate integrated rectangular waveguide

Publication Year: 2002, Page(s):333 - 335
Cited by:  Papers (371)
| | PDF (191 KB) | HTML

Dispersion properties of the substrate integrated rectangular waveguide (SIRW) are rigorously obtained using the BI-RME method combined with the Floquet's theorem. Our analysis shows that the SIRW basically has the same guided-wave characteristics as the conventional rectangular waveguide. Empirical equations are derived from the calculated dispersion curves in order to estimate the cutoff frequen... View full abstract»

• ### Vertical Split Ring Resonator Using Vias With Wide Bandwidth and Small Electrical Size

Publication Year: 2017, Page(s):16 - 18
Cited by:  Papers (1)
| | PDF (789 KB) | HTML

In this letter, we propose a vertically inserted split ring resonator (SRR) in microstrip lines. Since the top and bottom layers of the resonator are electrically connected by using via holes and it has a 3-D shape, it occupies a small electrical size. Through numerical simulations and measurement, it is shown that it can provide a wider range variation of bandwidth than conventional planar SRRs a... View full abstract»

• ### A Broadband Multistage LNA With Bandwidth and Linearity Enhancement

Publication Year: 2016, Page(s):834 - 836
| | PDF (1727 KB) | HTML

Design techniques to enhance bandwidth and linearity of broadband multistage low-noise amplifiers (LNAs) are presented. A feedback amplifier circuit is proposed to compensate for transistor gain roll-off with frequency in other amplifier stages and extend overall bandwidth. Moreover, a transistor width tapering in a multistage LNA is applied to improve linearity. These techniques are adopted in a ... View full abstract»

• ### Wideband Bandpass Filter Using U-Slotted Substrate Integrated Waveguide (SIW) Cavities

Publication Year: 2015, Page(s):1 - 3
Cited by:  Papers (20)
| | PDF (717 KB) | HTML

A wideband fifth-order bandpass filter (BPF) is proposed and designed using the U-slotted substrate integrated waveguide (SIW) cavities. The U-shape slots, etched on the SIW cavity, are used to form up a new multiple-mode resonator (MMR) in order to achieve a wide passband of operation while keeping the overall size of the filter circuit to be much compact. The proposed fifth-order SIW filter is 2... View full abstract»

• ### Dual-Band Filtering Power Divider With High Selectivity and Good Isolation

Publication Year: 2016, Page(s):774 - 776
Cited by:  Papers (3)
| | PDF (741 KB) | HTML

A novel microstrip dual-band filtering power divider (FPD) is presented in this letter. By introducing a proper coupling topology between the quarter-wavelength (λ/4) shortended microstrip line and two multi-mode resonators, the dualband FPD is constructed. Meanwhile, good isolation of this FPD is attained by installing an isolation resistor between the resonators. Additionally, two 3;... View full abstract»

• ### Wide-Range Adaptive RF-to-DC Power Converter for UHF RFIDs

Publication Year: 2016, Page(s):634 - 636
Cited by:  Papers (3)
| | PDF (1415 KB) | HTML

A wide-range, differential, cross-coupled rectifier is proposed with an extended dynamic range of input RF power that enables wireless powering from varying distances. The proposed architecture mitigates the reverse-leakage problem in conventional, cross-coupled rectifiers without degrading sensitivity. A prototype is designed for UHF RFID applications, and is implemented using 0.18 μm CMOS... View full abstract»

• ### Contactless Measurement of Absolute Voltage Waveforms by a Passive Electric-Field Probe

Publication Year: 2016, Page(s):1008 - 1010
| | PDF (851 KB) | HTML

This work proposes an improved technique for accurate, contactless measurement of the absolute voltage waveforms of microwave circuits, employing a passive electric-field sensing probe. The proposed technique uses an electromagnetic model of the interaction between the probe and a device under test, to allow the extraction of the coupling capacitance variation versus frequency. Employing these inf... View full abstract»

• ### A Compact Broadband Direct Coaxial Line to SIW Transition

Publication Year: 2016, Page(s):894 - 896
| | PDF (924 KB) | HTML

In this letter, a novel coaxial line to substrate integrated waveguide (SIW) broadband transition is presented. The transition is designed by connecting the inner conductor of a coaxial line to an open-circuited SIW. The configuration directly transforms the TEM mode of a coaxial line to the fundamental TE10 mode of the SIW. A prototype back-to-back transition is fabricated for X-band operation us... View full abstract»

• ### Compact Tunable Balanced Bandpass Filter With Novel Multi-Mode Resonator

Publication Year: 2017, Page(s):43 - 45
| | PDF (873 KB) | HTML

A novel multi-mode resonator is presented to design compact tunable balanced bandpass filters (BPFs). From the theoretical analysis, the common-mode (CM) resonant frequencies are different from that of the differential-mode (DM) response, so the CM suppression can be achieved without adding any extra lumped elements. For the DM response, the modal frequencies of odd and even modes can be adjusted ... View full abstract»

• ### Low-Cost Inkjet Printed Passive Booster for Increasing the Magnetic Coupling in Proximity of Metal Object for NFC Systems

Publication Year: 2016, Page(s):996 - 998
Cited by:  Papers (1)
| | PDF (669 KB) | HTML

A passive fully inkjet-printed circuit on a plastic based flexible substrate for increasing the communication read range of an NFC based system is proposed. Two parallel coils resonating at 13.56 MHz are used for the improvement of coupling between the transmitter and receiver. The proposed system behaves like a lens by concentrating the absorbed magnetic energy from a wide area in a small focal r... View full abstract»

• ### A 2-15 GHz VCO With Harmonic Cancellation for Wide-Band Systems

Publication Year: 2016, Page(s):933 - 935
Cited by:  Papers (1)
| | PDF (956 KB) | HTML

A 2-15 GHz SiGe VCO (voltage controlled oscillator) has been developed with a very low harmonic content. The design is based on the harmonic cancellation concept and uses a multiple-phase ring oscillator together with a wide-band active-weighted summer. The VCO results in an output power of -8 to -6 dBm and <; -50 dBc 3rd and 5th harmonic level at 2-15 GHz. The active area of the chip is very s... View full abstract»

• ### Ku Band Continuously Tunable Circular Cavity SIW Filter With One Parameter

Publication Year: 2016, Page(s):270 - 272
Cited by:  Papers (3)
| | PDF (896 KB) | HTML

This letter introduces a Ku band continuously tunable filter with one parameter. The proposed filter is implemented using substrate integrated waveguide (SIW) technology and has a simple and symmetrical structure. The tunability of the circular resonator is a kind of mechanical tuning, achieved by the different distance between moving copper column and the center of the circular cavity. Location o... View full abstract»

• ### A reconfigurable microstrip antenna for switchable polarization

Publication Year: 2004, Page(s):534 - 536
Cited by:  Papers (167)  |  Patents (3)
| | PDF (2024 KB) | HTML

A novel reconfigurable microstrip antenna with switchable polarization sense is proposed. The proposed antenna has a simple structure, consisting of a corner-truncated square radiating patch, four small triangular conductors, and a microstrip line feed. Using independently biased PIN diodes on the patch, it can produce linear polarization, or left- or right-hand circular polarization according to ... View full abstract»

• ### On the Improved High-Frequency Linearity of Drain Extended MOS Devices

Publication Year: 2016, Page(s):999 - 1001
| | PDF (649 KB) | HTML

Based upon two-tone measurements, 5dB improvement in the linearity behavior of drain extended MOS (DeMOS) device is reported by novel drain engineering. The presented modification significantly improves the device saturation characteristic, ON resistance and transconductance without affecting the breakdown behavior. Formation of IMD sweet-spot by device design is shown and verified using DeMOS dev... View full abstract»

• ### Reconfigurable Single/Multi-Band Filtering Power Divider Based on Quasi-Bandpass Sections

Publication Year: 2016, Page(s):684 - 686
Cited by:  Papers (4)
| | PDF (827 KB) | HTML

A new class of adaptive Wilkinson-type filtering power divider that simultaneously exhibits single/multi-band operation, frequency tuning, and controllable number of passbands is reported. It exploits the incorporation of single/multi-band quasi-bandpass sections into the input/output terminals of the power divider, whose quarter-wavelength-long transmission-line segments are reused as impedance i... View full abstract»

• ### A Compact Half-Mode Substrate Integrated Waveguide Bandpass Filter With Wide Out-of-Band Rejection

Publication Year: 2016, Page(s):501 - 503
Cited by:  Papers (4)
| | PDF (724 KB) | HTML

A compact bandpass filter exhibiting an ultra-wide out-of-band rejection is studied and developed. A combination of electromagnetic bandgap (EBG)-loaded half-mode substrate integrated waveguide (HMSIW) and composite right/left-handed (CRLH) HMSIW is used in this development. The proposed filter operates below the characteristic cutoff frequency of HMSIW. The CRLH HMSIW loaded with EBG structures i... View full abstract»

• ### Miniaturization of a 90° Hybrid Coupler with Improved Bandwidth Performance

Publication Year: 2016, Page(s):891 - 893
Cited by:  Papers (2)
| | PDF (757 KB) | HTML

This letter presents a compact hybrid coupler having wider bandwidth compared to a conventional 90° branch line coupler. Coupling between two closely spaced branches is utilized for the improvement. Closed form expressions are derived using a lossless transmission line theory. Further, graphs are presented to determine size of the coupler with the required bandwidth specifications. In the b... View full abstract»

• ### A New Approach to Design Microstrip Wideband Balun Bandpass Filter

Publication Year: 2016, Page(s):116 - 118
Cited by:  Papers (8)
| | PDF (753 KB) | HTML

A new design method of microstrip wideband balun bandpass filter (BPF) is presented in this letter. By utilizing the standing-wave property of voltage distribution along an open-circuited half-wavelength (λ/2) microstrip transmission line, the out-of-phase signals can be obtained at two output ports of a balun. Meanwhile, proper coupling topologies between the open-circuited λ/2 micr... View full abstract»

• ### Novel Four-Way Multilayer SIW Power Divider With Slot Coupling Structure

Publication Year: 2015, Page(s):799 - 801
Cited by:  Papers (2)
| | PDF (745 KB) | HTML

A novel four-way multilayer substrate integrated waveguide (SIW) power divider with slot coupling structure is proposed in this letter. Two rectangular slots located in the right and left arms of SIW T-junction are employed to achieve efficient transition with two microstrip lines. Good impedance matching and signal transmission between SIW and microstrip lines are achieved. Two isolation resistor... View full abstract»

• ### On the Continuity of High Efficiency Modes in Linear RF Power Amplifiers

Publication Year: 2009, Page(s):665 - 667
Cited by:  Papers (117)  |  Patents (2)
| | PDF (338 KB) | HTML

A novel formulation for the voltage waveforms in high efficiency linear power amplifiers is described. This formulation demonstrates that a constant optimum efficiency and output power can be obtained over a continuum of solutions by utilizing appropriate harmonic reactive impedance terminations. A specific example is confirmed experimentally. This new formulation has some important implications f... View full abstract»

• ### A 10:1 Unequal Wilkinson Power Divider Using Coupled Lines With Two Shorts

Publication Year: 2009, Page(s):789 - 791
Cited by:  Papers (28)
| | PDF (268 KB) | HTML

Abstract-A novel unequal Wilkinson power divider is presented. A coupled-line section with two shorts is proposed to realize the high characteristic impedance line, which cannot be implemented by conventional microstrip fabrication technique due to fabrication limitation. The proposed coupled-line structure is compatible with single layer integration and can be easily designed based on an even-odd... View full abstract»

• ### A Wideband Active Phase Shifter using Positive and Negative Inductance/Capacitance

Publication Year: 2016, Page(s):927 - 929
| | PDF (814 KB) | HTML

This letter presents an active phase shifter providing a quasi-constant transmission (S21) phase over a wide frequency range. The active phase shifter consists of positive and negative inductance/capacitance(L/C). The transmission phase of the positive L/C is compensated by that of the negative L/C along the frequency. The active phase shifter was implemented in IBM 7RF 180 nm CMOS tech... View full abstract»

• ### Compact Constant Bandwidth Tunable Wideband BPF With Second Harmonic Suppression

Publication Year: 2016, Page(s):870 - 872
| | PDF (1283 KB) | HTML

A compact tunable wideband bandpass filter (BPF) having constant absolute bandwidth (CABW) with tunable selectivity and second harmonic suppression is presented in this letter. The BPF is designed using non-uniform quarter-wave spiral resonators loaded with varactor diodes and a capacitively coupled stub. The BPF consists of combline coupled section also. It is shown that the inherent transmission... View full abstract»

## 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

## Meet Our Editors

Editor in Chief
N. Scott Barker
Dept. Elect. Comp. Eng.
University of Virginia
Charlottesville, VA 22904
barker@virginia.edu
dsk6n@virginia.edu