RF Circuits

  

This list of circuits are related to Radio frequency (RF), that deals with circuits that are designed to operate in the radio frequency spectrum. These circuits are set to operate within the range of about 3 kHz up to 300 GHz.

These circuits are incorporated with everything that transmits or receives radio waves, like mobile phones, radios, Wi-Fi, two-way radios, gps circuits, jammer ciruits, transmitters, rf amplifiers, RF oscillators, PLLs, Voltage-controlled oscillators, Transmitters, Transmission lines, RF connectors, Antennas, Receivers, Tuners, Modulators, demodulators, detectors, RF filters, RF shielding, Ground plane, DSSS, Digital radio, etc. 

Electric currents that oscillate at radio frequencies have special properties not shared by direct current or alternating current of lower frequencies. The energy in an RF current can radiate off a conductor into space as electromagnetic waves (radio waves); this is the basis of radio technology. RF current does not penetrate deeply into electrical conductors but flows along their surfaces; this is known as the skin effect. For this reason, when the human body comes in contact with high power RF currents it can cause superficial but serious burns called RF burns. In order to receive radio signals an antenna must be used. However, since the antenna will pick up thousands of radio signals at a time, a radio tuner is necessary to tune in to a particular frequency (or frequency range). This is typically done via a resonator in its simplest form, a circuit with a capacitor and an inductor forming a tuned circuit. Radio frequency (RF) energy has been used in medical treatments for over 80 years,  generally for minimally invasive surgeries, using radiofrequency ablation and coagulation, including the treatment of sleep apnea. Magnetic resonance imaging (MRI) uses radio frequency waves to generate images of the human body.

People are requesting walkie-talkie and RF remote control schematics, so here are some. Building these circuits needs special equipment and expertise in RF circuits. If you have no experience in RF, I suggest that you choose the easy way and buy a ready-made RF module. Otherwise you can realize you have an exact copy of a circuit in your hand, still it doesn't work the way it should.

 

 

News

Day: March 21, 2017

Hackaday Day: March 21, 2017 Hackaday The first radio transmitters used an electric arc to generate their RF , but were extremely inefficient and wideband, causing interference. A refinement treated the spark not as...

Mar 21, 2017

Gunn diode

Hackaday Gunn diode Hackaday The first radio transmitters used an electric arc to generate their RF , but were extremely inefficient and wideband, causing interference. A refinement treated the spark not as the source...

Mar 21, 2017

Learning Module Educates Students on RF, Wireless Concepts

Learning Module Educates Students on RF , Wireless Concepts Electronics360 ADALM2000 Active Learning Module allows students to design and test analog circuits in real time. Source: Analog Devices. Analog Devices is...

Mar 23, 2017

When is it best to use LDO regulators?

When is it best to use LDO regulators? Electronics Weekly For best overall efficiency, many high performance analog and RF circuits are powered from LDOs post-regulating the output of a switching converter. This requires...

Mar 21, 2017

Bonding SMT components via inkjet printing

Electronics EETimes (registration) Bonding SMT components via inkjet printing Electronics EETimes (registration) They describe their recently patented approach in the AIP Journal of Applied Physics in a paper titled...

Mar 16, 2017

How Does a Voltage Multiplier Work?

Hackaday How Does a Voltage Multiplier Work? Hackaday Note that each component in the circuit only sees at most twice the peak input voltage provided by the source, therefore you can use low voltage components...

Mar 22, 2017

Peregrine Semiconductor, A Murata Company, Acquires Arctic Sand Technologies

Electronics Weekly Peregrine Semiconductor, A Murata Company, Acquires Arctic Sand Technologies Design and Reuse (press release) SAN DIEGO -- March 20, 2017 -- Peregrine Semiconductor Corp., a Murata company and the...

Mar 20, 2017

MFG-2000 RF Function Generators come with 100kHz power amplifier channel.

ThomasNet News (press release) (blog) MFG-2000 RF Function Generators come with 100kHz power amplifier channel. ThomasNet News (press release) (blog) The MFG-2000 series supports various frequency and amplitude...

Mar 6, 2017

HUBER+SUHNER to display latest Polatis, Cube Optics and RF solutions at OFC 2017

HUBER+SUHNER to display latest Polatis, Cube Optics and RF solutions at OFC 2017 RealWire (press release) HUBER+SUHNER, leading international manufacturer of components and systems for optical and electrical...

Mar 14, 2017

Mouser Electronics Distributes Coilcraft Products Globally

Business Wire (press release) Mouser Electronics Distributes Coilcraft Products Globally Business Wire (press release) DALLAS & FORT WORTH, Texas--(BUSINESS WIRE)--Mouser Electronics, Inc., the authorized global...

Mar 14, 2017

Units & Modules