OOIR: Observatory of International Research

Papers

(The median citation count of IEEE Microwave and Wireless Components Letters is 7. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2021-06-01 to 2025-06-01.)

Article	Citations
IEEE Microwave and Wireless Components Letters information for authors	69
IEEE Microwave and Wireless Components Letters publication information	62
Table of Contents	55
Designing a Broadband Amplifier Without Load–Pull	54
Table of Contents	54
A 28-GHz CMOS Power Amplifier Linearized by Dynamic Conductance Control and Body Carrier Injection	53
An Active Leakage Canceller Adopting Switched-Capacitor Digital Power Amplifier for UHF-RFID Transceiver	45
The Threshold Optimization of the Canonical Piecewise Linear Function-Based Model for RF PA Linearization	41
Experimental Investigation of Resistive–Reactive Class-J Mode Using Time-Domain Low-Frequency Active Harmonic Load–Pull Measurements	41
1-Thru Deembedding Method for One-Port Microwave Device Characterization	40
A 16–24-GHz SiGe Decibel-Linear Low-Gain-Error Digitally Controlled High-Efficiency Variable Gain Amplifier	38
Comments on “Two-Section Broadband Couplers With Wide-Range Phase Differences and Power-Dividing Ratios”	36
A 2.4-GHz Sub-Sampling PLL With an Adaptive and No Power Contribution FLL Achieving 103.58 fs rms Jitter and −257.8 dB FOM	34
RF Characterization of 3-D-Printed Tunable Resonators on a Composite Substrate Infused With Magnetic Nanoparticles	33
Proof-of-Concept of Millimeter-Wave RF Beamforming Transmitter Architecture Employing Frequency-Multiplier-Based Up-Converters	33
Back-Gate Lumped Resistance Effect on AC Characteristics of FD-SOI MOSFET	32
Frequency Division Multiplexer With Directional Filters in Multilayer LCP Films at - and -Band	32
A Low Complexity LUT-Based Digital Predistortion Block With New Pruning Method	32
A Linearity-Enhanced 18.7–36.5-GHz LNA With 1.5–2.1-dB NF for Radar Applications	31
Broad Dual-Band Rectifier With Wide Input Power Ranges for Wireless Power Transfer and Energy Harvesting	31
Electromagnetic Analysis of Integrated On-Chip Sensing Loop for Side-Channel and Fault-Injection Attack Detection	30
Miniaturized Half-Mode T-Septum SIW Bandpass Filter With an Ultrawide Stopband	30
Compact and Efficient Broadband Rectifier Using T-type Matching Network	29
3-D Printed Dual-Band Filter Based on Spherical Dual-Mode Cavity	29
The Second Source Harmonic Optimization in Continuous Class-GF Power Amplifiers	29

Systematic Design of Wideband Bandpass Filters Based on Short-Circuited Stubs and λ/2 Transmission Lines	28
A High-Gain Doherty Power Amplifier With Harmonic Tuning	28
Self-Sensing Digital Predistortion of RF Power Amplifiers for 6G Intelligent Radio	28
A Tunable Multimode Quadrature Balanced N-Path Diplexer With Nonlinear Cross-Modulation Distortion Correction	27
Investigation of a Modified Flat-Roofed Sine Waveguide Slow-Wave Structure for Wideband 220-GHz TWT	27
An Ultrasensitive 14-GHz 1.12-mW EPR Spectrometer in 28-nm CMOS	27
Investigation of the Impact of Zero-Forcing Precoding on the Variation of Massive MIMO Transmitters’ Performance With Channel Conditions	27
Feasibility of Additively Manufactured Tunable Liquid Crystal Loaded Dielectric Waveguides	26
Improved Leapfrog LOD-FDTD Method With Controlling Parameters	26
2 × 4 VGA-Less Bidirectional Dual-Polarization 28 GHz Beamformer in 130-nm SiGe BiCMOS	25
A 16-nW-57-dBm Sensitivity Wakeup Receiver Using MEMS-Based Matching Network	25
Dual-Bandstop Substrate-Integrated-Coaxial Tunable and Static RF Filters	25
Filtering T-Type Switch With Flexible Signal Routing Reconfigurability for Crossover-/Adjacent-Channel Applications	25
Multi-Angle Recognition of Vehicles Based on Carrier-Free UWB Sensor and Deep Residual Shrinkage Learning	24
Convolutional Implementation and Analysis of the CFS-PML ABC for the FDTD Method Based on Wave Equation	24
A High-Density and Low-Crosstalk Differential Pin Map for 112 Gb/s PAM4 Applications	24
Model-Based VF Technique for Parasitic Reflections Reduction of Frequency-Domain Chipless RFID Systems	23
A High Conversion Gain Frequency Doubler Using Transformer-Based Second Harmonic Feedback Technique in 28-nm CMOS	23
A Ka-Band 6-Bit Digital-Controlled Differential VGA With 16-dB Gain Control Range and 4.9° Phase Variation in 65-nm CMOS	23
A 0.43 g Wireless Battery-Less Neural Recorder With On-Chip Microelectrode Array and Integrated Flexible Antenna	23
A Fully-Integrated Ka-Band CMOS Rectifier Using Large Signal Analysis for Wireless Power Transfer	22
Efficient and Compact Tri-Band Rectifier With Large Frequency Ratio for WPT	22
Half-Mode Waveguide Based on Gap Waveguide Technology for Rapid Prototyping	22
Broadband High-Efficiency RF Rectifier With a Cross-Shaped Match Stub of Two One-Eighth-Wavelength Transmission Lines	22
Synthesis Design of Wideband Phase Shifters Using Coupled-Line Structure	22
FR4-Based Low Phase Noise SISL VCO Using Tunable Weakly Coupled Resonators	22
Highly Miniaturized Continuously Tunable Phase Shifter Based on Liquid Crystal and Defected Ground Structures	22
Table of Contents	21
IEEE Microwave and Wireless Components Letters Information for Authors	21
A Millimeter-Wave Variable-Gain Power Amplifier With P₁ dB Improvement Technique in 65-nm CMOS	21
IEEE Microwave and Wireless Components Letters information for authors	21
Chest and Abdominal Signals Separation Based on SIMO Radar With Difference Beamforming	21
A Digital Correction Method for Increased Dynamic Range in Interferometric Six-Port Radars	20
IEEE Microwave and Wireless Components Letters publication information	20
Novel High-Isolation Polarization and Multimode Division Circuit for Circular Waveguide	20
A 0.4-V High-Gain Low-Noise Amplifier Using a Variable-Frequency Image-Rejection Technology	20
Instinctual Interference-Adaptive Low-Power Receiver With Combined Feedforward and Feedback Control	20
Terahertz WR-2.2 Waveguide to Transmission-Line Transition on Silicon Substrate Fabricated Using MEMS Technology	19
Three-Layer Compact K/Ka Feed Chain Using Enhanced Ortho-Mode Junction	19
Automated Diplexer Design With Key Performance Indicator-Based Objectives	19
A Quantitative Analysis of Physical Security and Path Loss With Frequency for IBOB Channel	19
Current-Reused Divide-by-16 Injection-Locked Frequency Divider	19
A 18–44 GHz Low Noise Amplifier With Input Matching and Bandwidth Extension Techniques	19
Wideband Butler Matrix Based on Dual-Layer HMSIW for Enhanced Miniaturization	19
A 26–31 GHz Linearized Wideband CMOS LNA Using Post-Distortion Technique	19
Dual-Purpose Planar Radial-Array of Rectenna Sensors for Orientation Estimation and RF-Energy Harvesting at IoT Nodes	19
Table of contents	18
A 140-μW Front-End With 5.7-dB NF and +10-dBm OOB-IIP3 Using Voltage-Mode Boosting Mixer	18
Magnitude Scaling-Based Behavioral Model for Power Amplifiers With Dynamic Power Transmission	18
Welcome to the New Editor-in-Chief	18

Table of Contents	18
Corrections to “Compact Filtering Balun With Wide Stopband and Low Radiation Loss Using Hybrid Microstrip and Substrate-Integrated Defected Ground Structure”	18
A 31-Tap Reconfigurable Analog FIR Filter Using Heterogeneously Integrated Polystrata Delay-Lines	18
IEEE Microwave and Wireless Components Letters information for authors	18
A Compact 275–320-GHz Reflection-Type Phase Shifter	18
W-Band E-Plane Waveguide Filter Using Compact Beeline Resonator	18
Table of contents	18
Ultralow Power E-Band Low-Noise Amplifier With Three-Stacked Current-Sharing Amplification Stages in 28-nm CMOS	17
A 61-GHz Rectifier Using Internal Voltage Cancellation and Body-Biasing Techniques in 22-nm FDSOI	17
Generalized Ridge Regression-Based Few-Sample Learning Digital Predistortion	17
Corrections to “Parameterized Modeling Incorporating MOR-Based Rational Transfer Functions With Neural Networks for Microwave Components” [May 22 379-382]	17
A 1.9-dB NF K-Band Temperature-Healing Phased-Array Receiver Employing Hybrid Packaged 65-nm CMOS Beamformer and 0.1-μm GaAs LNAs	17
A Nonlinear Rectifying Diode Model for Low and High Power Levels in Microwave Regime	17
Dual-Broadband Impedance Converter Based on Multiedge Frequency Matching Technique	17
Load-Modulation-Based IMD3 Cancellation for Millimeter-Wave Class-B CMOS Power Amplifiers Achieving EVM < 1.2%	17
Compact Dual-Band Balanced-to-Unbalanced Filtering Power Divider Design With Extended Common-Mode Suppression Bandwidth	17
A Highly Linear Dual-Stage Amplifier With Beyond 1.75-THz Gain–Bandwidth Product	17
IEEE Microwave and Wireless Components Letters information for authors	17
A 0.6-dB Low Loss and 3–165 GHz Wideband Phase Difference Sub-THz Coupler in 0.18-μm CMOS	17
Received Signal Strength Estimation in Indoor Environment Using High Frequency Rytov Approximation	17
Dual-Band Balanced to Unbalanced Multilayer Filtering Magic-T Based on SIW Cavity	17
A Broadband Rectifier With Wide Incident Angle of Incoming Waves Based on Quadrature Coupler for RF Energy Harvesting	16
A Dual-Mode SIW Compact Monopulse Comparator for Sum and Difference Multibeam Radar Applications	16
A Spatial Modes Filtering FETD Method Combined With Domain Decomposition for Simulating Fine Electromagnetic Structures	16
A True Inline Coaxial-Cavity Filter With Two Symmetric Zeros	16
A 3.6 mW 60 GHz Low-Noise Amplifier With 0.6 ns Settling Time for Duty-Cycled Receivers	16
Miniaturized High-Power Beam Steering Network Using Novel Nonplanar Waveguide Butler Matrix	16
Dual-Mode RF Mixer for Low-Power Direct-Conversion Receiver	16
Modeling Thick Metal in Forward Volume Spin Wave Transducers	16
Localization With Distributed MIMO Using a High-Speed Sigma-Delta-Over-Fiber Testbed	16
Stochastic Optimization of the CPL-Function-Based Model for RF Power Transistors	16
A Small-Signal Description of Black-Phosphorus Transistor Technologies for High-Frequency Applications	16
Design of Compact Coupled Resonators for Triple-Band Wireless Power Transfer	16
A 77-GHz Low-Conversion-Loss Fourth-Harmonic Mixer on SISL Platform	16
Closed-Loop Antenna Impedance Tuning via Transfer Function Learning for 5G Sub-6 GHz User Equipment	16
A Divide-by-Three ILFD With Second Harmonic Enhancement	16
IEEE Microwave and Wireless Components Letters Publication Information	16
A Monolithic Vertical Integration Concept for Compact Coaxial-Resonator-Based Bandpass Filters Using Additive Manufacturing	15
Mode Composite Folded Substrate Integrated Waveguide	15
Uniformly Distributed Near-Field Probing Array for Enhancing the Performance of 5G Millimeter-Wave Beamforming Transmitters	15
A Band-Limited Magnitude-Selective Affine Function-Based Model for Digital Predistortion of 5G Broadband Power Amplifiers	15
A Wide Tuning-Range Triple-Mode CMOS VCO Using Switched-Tunable Inductor	15
IEEE Microwave and Wireless Components Letters publication information	15
Telemetry Transmission to Support Bidirectional Communication for Capsule Endoscope Using Human Body Communication	15
A Low Phase Noise K-Band VCO With a Threshold Voltage-Based Current Source	15
IEEE Microwave and Wireless Components Letters publication information	15
Additive Manufacturing of a Wideband Capable W-Band Packaging Strategy	15
A W-Band 1-dB Insertion Loss Wilkinson Power Divider Using Silicon-Based Integrated Passive Device	15
Coaxial Control in Iteration Synthesis of Axis-Perturbed Mode Converter	15
A 230-GHz Endfire SIS Mixer With Near Quantum-Limited Performance	15
Filtering Power Divider With Tunable Attenuation Based on Graphene Nanoplates	14
A Broadband 10–43-GHz High-Gain LNA MMIC Using Coupled-Line Feedback in 0.15-μm GaAs pHEMT Technology	14
A 440–540-GHz Transmitter in 130-nm SiGe BiCMOS	14
Dual-Band Ultrathin Polarization Converter for S-Band Microwave Transmission	14
Waveguide Cell With Water Filling for Passive Intermodulation Localization on Planar Circuits	14
A 300-GHz Low-Noise Amplifier in 130-nm SiGe SG13G3 Technology	14
Multitarget Simulator for Automotive Radar Sensors With Unknown Chirp-Sequence Modulation	14
A W-Band SPDT Switch With 15-dBm P1dB in 55-nm Bulk CMOS	14
2–8 GHz Interference Detector With 1.1 μs Response	14
A Compact Asymmetric Waveguide Orthomode Transducer for Millimeter-Wave Applications	14
A High-Efficiency 28 GHz/39 GHz Dual-Band Power Amplifier MMIC for 5G Communication	14
110–140-GHz Wide-IF-Band 65-nm CMOS Receiver Design for Fusion Plasma Diagnostics	14
A K-Band CMOS Standing Wave Oscillator Using Digital-Controlled Artificial Dielectric Differential Transmission Lines	14
Equivalent Circuit-Based Coupling Modeling of Double Bond Ribbons Interconnection Variation in Electronic Packaging	14
An E-Band High-Performance Variable Gain Low Noise Amplifier for Wireless Communications in 90-nm CMOS Process	14
Shape Modeling of Microstrip Filters Based on Convolutional Neural Network	14
Implementation of Distributed-Element Foster Section and Its Applications to Bandpass Filters	14
Cryogenic Characterization of the High Frequency and Noise Performance of SiGe HBTs From DC to 70 GHz and Down to 2 K	14
Quality Improved Real-Time Microwave Imaging Using BP-TwIST Method	14
A New High-Frequency HEMT GaN Extrinsic Capacitance Extraction Technique	14
Dual-Band VCO Using High Quality Factor Two Orthogonally Located Inductors in 0.18-μm CMOS Technology	14
Single-Crystalline LiTaO₃ Film-Based High-Frequency Surface Acoustic Wave Resonators and Electronics Applications	14
A Broadband High-Efficiency Rectifier for Mid-Field Wireless Power Transfer	14
W-Band Bandpass Filter Using Rectangular Microcoaxial Structure	14
A 2-Bit Voltage-Controlled Oscillator (VCO) for Multiband Wireless Applications	14
A Broadband Power Divider Based on Vertically Installed Planar Circuit Structure	13
Long-Range FM Backscatter Tag With Tunnel Diode	13
A New Explicit–Implicit Hybridizable Discontinuous Galerkin Time-Domain Method for Electromagnetics	13
Temperature Compensated Internal LNA Noise Calibration Source	13
Measurement of Uniaxially Anisotropic Dielectrics With a Fabry–Perot Open Resonator in the 20–50 GHz Range	13

IEEE Microwave and Wireless Components Letters information for authors	13
Vertical Waveguide-to-Microstrip Self-Diplexing Transition for Dual-Band Applications	13
An Unequal Wilkinson Power Divider Based on Integrated Passive Device Technology and Parametric Model	13
A Broadband Coaxial Line-to-SIW Transition Using Aperture-Coupling Method	13
A 5-W GaN Doherty Amplifier for Ka-Band Satellite Downlink With 4-GHz Bandwidth and 17-dB NPR	13
3–9-GHz CMOS LNA Using Body Floating and Self-Bias Technique for Sub-6-GHz 5G Communications	13
Subnanoliter Sensing of Dielectric Properties of Liquid-in-Flow at 190 GHz	13
IEEE Microwave and Wireless Components Letters information for authors	13
Broadband 100-W Ka-Band SSPA Based on GaN Power Amplifiers	12
IEEE Microwave and Wireless Components Letters information for authors	12
Doppler Shift Tolerance of Accumulation and Outer Coding in MIMO-PMCW Radar	12
Design of 0.6–0.8-GHz and 1.6–1.9-GHz Dual-Band PA With Peak PAEs of Over 70% by NPE Method With Dynamical Continuous-Mode Criteria	12
IEEE Microwave and Wireless Components Letters information for authors	12
A Novel Architecture for Frequency Doubler Featuring Compact 3-D Stacked Packaging and Four Multiplying Structures	12
Output Phase and Amplitude Analysis of GaN-Based HEMT at Cryogenic Temperatures	12
Time-Division Multiple Tags Based Multitarget Respiration Monitoring Radar With a Single Beam	12
Table of Contents	12
Miniaturized Quarter-Mode SIW Filters Loaded by Dual-Mode Microstrip Resonator With High Selectivity and Flexible Response	12
IEEE Microwave and Wireless Components Letters information for authors	12
IEEE Microwave and Wireless Components Letters information for authors	12
Design and Analysis of a 26–34.5-GHz Power Amplifier With Balanced Mismatch Reduction and Interstage Matching	12
Editorial	12
A Fully Packaged Bandpass Filter on Stripline Patch Resonator With Wide Upper Stopband	12
A Circular Waveguide Dual-Mode Filter With Improved Out-of-Band Performance for Satellite Communication Systems	12
IEEE Microwave and Wireless Components Letters publication information	12
Extension of Babinet Principle to Complementary Metallic Elements on the Interface of Different Substrates	12
Asynchronous 256-Element Phased-Array Calibration for 5G Base Station	12
Table of Contents	12
30-GHz Low-Phase-Noise Scalable Multicore Class-F Voltage-Controlled Oscillators Using Coupled-Line-Based Synchronization Topology	12
Novel Double-Ridged Waveguide Orthomode Transducer for mm-Wave Application	12
A 40-Gb/s Modulator Driver Using Cascade Swing Compensation in 90 nm CMOS	12
A Reduced-Complexity Direct Learning Architecture for Digital Predistortion Through Iterative Pseudoinverse Calculation	11
A Low-Loss Broadband Planar Transition From Ground Coplanar Waveguide to Substrate-Integrated Coaxial Line	11
A Multipole Approach Toward On-Chip Metal Routing for Reduced EM Side-Channel Leakage	11
Directional Coupler Calibration for Accurate Online Incident Power Measurements	11
Cascaded Dispersive Delay Structure Based on Periodic Glide Symmetric Microstrip Stubs	11
DC Power-Optimized Ka-Band GaN-on-Si Low-Noise Amplifier With 1.5 dB Noise Figure	11
Design of a C-Band High Efficiency Power Amplifier With Compact Harmonic Control Network	11
Modified Pulse Position Modulation for Joint Radar Communication Based on Chirp Sequence	11
Low Phase Noise Oscillator Incorporating a Quarter-Wavelength Resonators-Based Network With Source/Load Coupling	11
A Novel Deep-Q-Network-Based Fine-Tuning Approach for Planar Bandpass Filter Design	11
An 18–50-GHz Δ–Σ Modulated Quasi-Continuous Digital Vector-Modulation Phase Shifter With Variable Gain Control	11
A W-Band 0.01 mm² Cavity Resonator Employing Slot-Loaded Shielded Folded Ridged Quarter-Mode in CMOS Technology	11
Miniaturized Dual-Band Power Splitter in LTCC for GNSS Applications	11
A Novel End-Wall Waveguide Excitation With Wide Bandwidth and Simple Structure for Millimeter-Wave/Terahertz Application	11
WR-3.4 InP HBT Amplifier Module With Integrated Wideband Waveguide Transitions	11
Parallel Non-Monte Carlo Transient Noise Simulation	11
Novel In-Line Microstrip-to-Waveguide Transition Based on E-Plane Probe T-Junction Structure	11
Contactless Measurement of Human Systolic Time Intervals Based on Doppler Cardiograms in Clinical Environment	11
CMOS Detector Using Customized Bolt-Wrench Capacitor on Backend Oxide Layer	11
A Miniaturized 3-D Metamaterial Absorber With Wide Angle Stability	11
High-Efficiency W-Band Pulsed TWT With Three-Stage Depressed Collector	11
High-Gain 670-GHz Amplifier Circuits in InGaAs-on-Insulator HEMT Technology	11
Radar-Based Mapping of the Environment: Occupancy Grid-Map Versus SAR	11
Hybrid Load-Modulated Balanced Amplifier With High Linearity and Extended Dynamic Range	10
The Charge-Based Flicker Noise Model for HEMTs	10
Hybrid Asymmetrical Load Modulated Balanced Amplifier With Wide Bandwidth and Three-Way-Doherty Efficiency Enhancement	10
A D-Band SiGe Power Amplifier Using a Four-Way Coupled-Line Wilkinson Combiner	10
Compact Half-Mode SIW Filter With High Selectivity and Improved Stopband Performance	10
An Artificial Intelligence Assisted Distance Variation Robust Microwave Sensor for Biofuel Analysis Applications	10
IEEE Microwave and Wireless Components Letters information for authors	10
Compact UWB BPF With Broad Stopband Based on Loaded-Stub and C-Shape SIDGS Resonators	10
An X/Ku Dual-Band Switchless Frequency Reconfigurable GaAs Power Amplifier	10
An Integrated Compact Phase Shifter With a Single Analog Control	10
Current Source Implementations for the HIE-FDTD Methods	10
A Differential D-Band Low-Noise Amplifier in 0.13 μm SiGe	10
Robust GaN-Based LNAs With Active Epitaxial Current Limiters	10
80–110-GHz Broadband Linear PA With 33% Peak PAE and Comparison of Stacked Common Base and Common Emitter PA in InP	10
Ferroelectric-on-Si Super-High-Frequency Fin Bulk Acoustic Resonators With Hf_0.5Zr_0.5O₂ Nanolaminated Transducers	10
Efficient EM Optimization Exploiting Parallel Local Sampling Strategy and Bayesian Optimization for Microwave Applications	10
Table of contents	10
A 1–42 GHz GaN Distributed Amplifier With Adjustable Gain by Voltage-Controlled Switch	10
A Substantially Lowered-Voltage High-Power W-Band Pulsed Traveling Wave Tube	10
Millimeter-Wave Hybrid RF-DC Converter Based on a GaAs Chip for IoT-WPT Applications	10
A Low-Noise W-Band Receiver in a 28-nm CMOS Technology	10
A Highly Efficient 18–40 GHz Linear Power Amplifier in 40-nm GaN for mm-Wave 5G	10
5G Millimeter-Wave Substrate-Integrated Waveguide Quad-Channel Diplexer With High In-Band and Wideband Isolation	10
Design of Planar Baluns With Filtering Response Using Coupled Line Sections	10
Time Domain Analysis of 3-D Microwave Film Bulk Acoustic Resonator Based on Electro- Mechanical Coupling Algorithm	10
Design and Analysis of High-Gain and Compact Single-Input Differential-Output Low Noise Amplifier for 5G Applications	9
A Reconfigurable S-/X-Band GaN MMIC Power Amplifier	9
A Miniaturized Differential Microwave Microfluidic Sensor With High Decoupling	9
Improving Wireless Power Transfer Efficiency With DC/DC Boost Charger by Multi-Sine Excitation at 5.8 GHz	9
A -Band Power Amplifier With Four-Way Combining in 0.13-μm SiGe	9
Table of Contents	9
Ring-Shaped D-Band E-Plane Filtering Coupler	9
A Compact and Broadband Balun Based on Multilayer SIW	9
High-Gain, Low-Power, and Low-Noise CMOS Mixer Using Current-Reused Bleeding Amplification	9
A Miniaturized Ultra-Wideband Radar for UAV Remote Sensing Applications	9
2022 Index IEEE Microwave and Wireless Components Letters Vol. 32	9
W-Band E-Plane Waveguide Bandpass Filter Based on Meander Ring Resonator	9
IEEE Microwave and Wireless Components Letters publication information	9
Modeling Microwave Connectors Used as Signal Launchers for Microstrip Lines of Different Widths	9
Enhanced Performance of Multilayer Bandpass Filter Using Slow-Wave Empty Substrate- Integrated Waveguide (SW-ESIW)	9
Ultralow Power K-Band Frequency Doubler With Differential Output	9