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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.

Circuits




The robot senses the surroundings through the CCD camera and sends to the receiver through the Radio Frequency wireless communication. ... The RF 434 MHz Transmitter output is up to 8mW at 433.92 M...

For example, the circuits we built for wireless receivers consume less than 20 mW power to operate, while also demonstrating the highest conversion gain of any graphene RF circuits at multiple GHz ...

... architecture, RF energy harvesting techniques and existing applications. Then, we present the background in circuit design as well as the state-of-the-art circuitry implementations, and review ...

Keywords: flexible electronics, medical devices, artificial retina, prosthetics, radio frequency circuits, biocompatible electronics, liquid-crystal polymers · [+]Enlarge. Curvy Chips. Radio freque...

... the world's leading university-research consortium for semiconductors and related technologies, promises to revolutionize portable radio frequency (RF) electronics and communication systems via...

2KM Long Range FM Radio Transmitter circuit. This long-range FM radio transmitter has an additional RF power amplifier stage, after the oscillator stage. The extra ... The circuit designed using tr...


Basics of RF Mixers in Radio Receivers / Mixer Tutorial / Frequency Conversion


How To Capture DC Voltage from Radiofrequency (RF) Radiation


Radio Electronics: Frequency Modulation Basic Principles pt1-2 1964 US Army T...


Wireless Radio Frequency Module Using PIC Micro-Controller (Part-1)