RF/ Microwave Basics for Engineers and Techs

Explore the electromagnetic spectrum and radiation, traveling in vacuum at the speed of light; examine visible light and RF bands, and their diverse applications from cell phones to radio telescopes.

Observe the rf signal generator output on a spectrum analyzer, comparing wired and wireless transmission. Track real-time frequency shifts from 1 ghz to 10 and note antenna-related attenuation over distance.

Identify electromagnetic interference and distinguish intentional radiators from unintentional radiators that produce RF noise. Recognize government EMI regulations, license band safety, and how a spectrum analyzer visualizes interference.

Demonstrates how a lower bandwidth resolution reveals noise and harmonics in a mixed signal around five gigahertz and three gigahertz, highlighting visible peaks, harmonics, and electromagnetic interference in the air.

Explore how filters remove unwanted frequencies and preserve desired signals, covering low-pass, high-pass, band-pass, and notch filters and their use in RF systems.

Explore rf and microwave signal generators across kilohertz to 20 gigahertz, including analog, vector, and synthesizer types, with applications in testing components, receivers, and test systems.

Explore RF and microwave instrumentation by measuring frequency with spectrum analyzers and phase noise analyzers, using time- and frequency-domain techniques with oscilloscopes and real-time spectrum analyzers.

Explore how a swept superheterodyne receiver powers a spectrum analyzer by mixing an unknown signal with a sweeping local oscillator to produce amplitude data across a start-to-stop frequency range.

Discover how RF attenuators protect sensitive circuitry by reducing power and mitigating spurs and modulation effects, with internal integrated and external fixed or variable options controlled by the spectrum analyzer.

Demonstrate in-line attenuation by applying a 20 dB attenuator to a 3 GHz signal and observe 20 dB of attenuation on the spectrum analyzer, with the output shown on screen.

The preamplifier is a low-noise amplifier that increases input signal amplitude, boosting signal-to-noise ratio and sensitivity for low-power signals, often controlled by the spectrum analyzer.

Examine how a low pass filter attenuates signals near a 200 megahertz cutoff using a sweep from a signal generator and a tracking generator with a spectrum analyzer.

Demonstrate how a low pass filter reduces harmonics and spurs in a 1 GHz rf signal, and discuss how pre-selection filters and different filter orders affect harmonic suppression.

Examine a 12-volt powered light amplifier, observe signal gain on a spectrum analyzer, and see how activating the amplifier increases gain and outputs the signal.

Operate a three-port mixer that multiplies the unknown input frequency with the local oscillator, producing the original RF signal, the LO, and the sum/difference frequencies while higher harmonics are ignored.

Analyze a mixer's output with a spectrum analyzer using RF 3 GHz and LO 5 GHz, noting LO minus RF 2 GHz and ignoring harmonics or noise.

Explore how the local oscillator provides a frequency reference for mixers with a voltage-controlled oscillator and crystal references, and how phase noise limits observation and is reduced by temperature control.

Place the if filter after the mixer, removing unwanted components and leaving the down-converted signal; designers use a fixed if with a swept lo to locate the unknown frequency.

See how analog to digital converters transform intermediate frequencies into digital outputs for DSD digital signal processors in spectrum analyzers. Integration reduces size, weight, and cost, with model s1365 datasheet.

Explore resolution bandwidth filtering after the ADC, using a gaussian band-pass shape to define center frequency and bandwidth while noting three and six dB points, selectivity, and EMI implications.

Understand how the envelope detector measures the voltage envelope of a swept rf signal, and how various detectors (positive peak, negative peak, RMS, quasi-peak) reveal noise and signal characteristics.

Apply the video bandwidth filter, a low-pass filter on each frequency band, to smooth the trace, reduce noise, and reveal the true signal, especially for low-power signals near instrument noise.

Explore the vector network analyzer, a swept heterodyne instrument that captures amplitude, frequency, and phase information, unlike scalar analyzers. Enable precise characterization of digital communication components.