Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Power01:08

Power

13.0K
The concept of work involves force and displacement; meanwhile, the work-energy theorem relates the net work done on a body to the difference in its kinetic energy, calculated between two points on its trajectory. While none of these quantities or relations involves time explicitly, we know that the time available to accomplish work is often just as important as the amount of work itself. For example, sprinters in a race may have achieved the same velocity at the finish, therefore,...
13.0K
Instantaneous Power01:22

Instantaneous Power

918
Instantaneous power is important in electrical circuits, mainly when dealing with sinusoidal input. Instantaneous power, denoted as p(t), results from the multiplication of the instantaneous voltage (v(t)) across an element and the instantaneous current (i(t)) flowing through it. This relationship adheres to the passive sign convention and represents a fundamental principle in electrical engineering.
918
Complex Power01:14

Complex Power

916
Power engineers have introduced the concept of complex power to determine the cumulative effect of parallel loads. This idea plays a crucial role in power analysis because it encompasses all the details related to the power consumed by a specific load.
Complex power is defined as the multiplication of the voltage and the complex conjugate of the current. The magnitude of this power, known as apparent power, is measured in volt-amperes (VA). Notably, the angle of the complex power equates to the...
916
Electrical Power01:07

Electrical Power

3.8K
Electric power is the product of current and voltage, represented in units of joules per second, or watts. For example, cars often have one or more auxiliary power outlets with which you can charge a cell phone or other electronic devices. These outlets may be rated at 20 amps and 12 volts, so that the circuit can deliver a maximum power of 240 watts. Consider a 25 Watt bulb and a 60 Watt bulb. The conversion of electrical energy produces heat and light, while the kinetic energy lost by the...
3.8K
Sums of Power01:22

Sums of Power

68
In definite integration, Riemann sums approximate the area under a curve by dividing it into subintervals and summing the areas of rectangles. When these approximations follow predictable numerical patterns, such as arithmetic or polynomial sequences, sum formulas offer a more efficient and accurate way to compute the result. In particular, the sum of consecutive integers, squares, and cubes plays an essential role in simplifying these calculations, especially when dealing with uniform...
68
Nuclear Power02:36

Nuclear Power

9.5K
Controlled nuclear fission reactions are used to generate electricity. Any nuclear reactor that produces power via the fission of uranium or plutonium by bombardment with neutrons has six components: nuclear fuel consisting of fissionable material, a nuclear moderator, a neutron source, control rods, reactor coolant, and a shield and containment system.
Nuclear Fuels
Nuclear fuel consists of a fissile isotope, such as uranium-235, which must be present in sufficient quantity to provide a...
9.5K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Profiles of stress hormones in relation to DENV serotypes among dengue-positive patients.

PloS one·2026
Same author

Development of reference material from Rift Valley fever virus RNA.

Virology journal·2026
Same author

Drug target mining and in silico screening of Tibetan plant metabolites for potential alleviation of Oroya fever, a neglected tropical disease.

Scientific reports·2026
Same author

Optimized Viability-ddPCR with Triton X-100 Enhancement for Selective Detection of Live <i>Salmonella enterica</i> and <i>Cronobacter sakazakii</i>.

Journal of microbiology and biotechnology·2026
Same author

Bioinformatics analysis of Rickettsia typhi autoimmune associations and screening of Streptomyces-derived inhibitors.

BioData mining·2025
Same author

Proteome mining of Yersinia Enterocolitica for drug targets and computational inhibitor identification with ADMET, anti-inflammation potential and formulation characteristics.

BioData mining·2025

Related Experiment Video

Updated: Feb 2, 2026

Construction of Constant-Load (Isotonic) and Constant-Velocity (Isokinetic) Torque-Velocity-Power Profiles In vivo for the Rat Plantar Flexors
07:44

Construction of Constant-Load (Isotonic) and Constant-Velocity (Isokinetic) Torque-Velocity-Power Profiles In vivo for the Rat Plantar Flexors

Published on: October 3, 2025

538

Ku-Band 50 W GaN HEMT Power Amplifier Using Asymmetric Power Combining of Transistor Cells.

Seil Kim1, Min-Pyo Lee2, Sung-June Hong3

  • 1Department of Radio Science and Engineering, Chungnam National University, Daejeon 34134, Korea. ksl4896@naver.com.

Micromachines
|November 28, 2018
PubMed
Summary

This study introduces a Ku-band 50 W power amplifier using Gallium Nitride (GaN) High Electron Mobility Transistor (HEMT) technology. Asymmetric power combining techniques achieve high output power and efficiency for radar applications.

Keywords:
GaN high electron mobility transistor (HEMT)Ku-bandamplitude balanceasymmetric power combiningphase balancepower amplifier

More Related Videos

Determining and Controlling External Power Output During Regular Handrim Wheelchair Propulsion
08:55

Determining and Controlling External Power Output During Regular Handrim Wheelchair Propulsion

Published on: February 5, 2020

8.0K
Establishing Organoids from Human Tooth as a Powerful Tool Toward Mechanistic Research and Regenerative Therapy
11:02

Establishing Organoids from Human Tooth as a Powerful Tool Toward Mechanistic Research and Regenerative Therapy

Published on: April 13, 2022

4.1K

Related Experiment Videos

Last Updated: Feb 2, 2026

Construction of Constant-Load (Isotonic) and Constant-Velocity (Isokinetic) Torque-Velocity-Power Profiles In vivo for the Rat Plantar Flexors
07:44

Construction of Constant-Load (Isotonic) and Constant-Velocity (Isokinetic) Torque-Velocity-Power Profiles In vivo for the Rat Plantar Flexors

Published on: October 3, 2025

538
Determining and Controlling External Power Output During Regular Handrim Wheelchair Propulsion
08:55

Determining and Controlling External Power Output During Regular Handrim Wheelchair Propulsion

Published on: February 5, 2020

8.0K
Establishing Organoids from Human Tooth as a Powerful Tool Toward Mechanistic Research and Regenerative Therapy
11:02

Establishing Organoids from Human Tooth as a Powerful Tool Toward Mechanistic Research and Regenerative Therapy

Published on: April 13, 2022

4.1K

Area of Science:

  • Electrical Engineering
  • Materials Science
  • Semiconductor Device Physics

Background:

  • High-power amplifiers are crucial for radar and communication systems.
  • Gallium Nitride (GaN) High Electron Mobility Transistors (HEMTs) offer superior performance characteristics for high-frequency applications.
  • Achieving optimal power combining in multi-cell amplifier designs presents significant challenges in maintaining amplitude and phase balance.

Purpose of the Study:

  • To design and demonstrate a Ku-band, 50 W internally-matched power amplifier.
  • To investigate the effectiveness of asymmetric power combining techniques for GaN HEMT cells.
  • To achieve balanced amplitude and phase signals at the transistor cell combining stage for improved performance.

Main Methods:

  • Utilized a large-signal transistor cell model for amplifier design within the foundry process.
  • Implemented asymmetric power combining using a slit pattern, oblique wire bonding, and an asymmetric T-junction.
  • Designed input and output matching circuits using thin-film processes on titanate and alumina substrates.

Main Results:

  • Achieved maximum saturated output power ranging from 57 to 66 W.
  • Demonstrated drain efficiency between 40.3% and 46.7%.
  • Obtained a power gain of 5.3 to 6.0 dB at power saturation across the 16.2 to 16.8 GHz frequency range under pulsed conditions (330 μs pulse period, 6% duty cycle).

Conclusions:

  • The asymmetric power combining strategy effectively balances amplitude and phase in multi-cell GaN HEMT amplifiers.
  • The developed Ku-band power amplifier meets demanding power and efficiency requirements for radar systems.
  • The thin-film matching circuits on specialized substrates contribute to the overall high-frequency performance.