Wireless & RF
4971 articles · Page 205 of 208
S-Parameter De-Embedding for On-Wafer RF Filter Characteriza
Guide engineers through removing probe pad and transmission line effects using TRL calibration and EM-simulated de-embedding structures.
How to Design a 50 Ω to 75 Ω Impedance Matching Network for
Provide calculable LC network values, PCB layout tips to minimize parasitics, and VNA validation steps for CATV upstream return path amplifiers.
Impedance Matching Networks for GaN HEMT Power Amplifiers: L
Compare design trade-offs (bandwidth, Q-factor, harmonic suppression) between microstrip stubs and Pi-networks for 3.5 GHz GaN PAs; include Smith chart walkthro
Wireless Coexistence Testing: Bluetooth/Wi-Fi/Thread Interfe
Outline standardized test setups (per EN 300 328 v2.2.2) to evaluate receiver desense in multi-radio IoT gateways; include channel overlap and duty cycle parame
RF Filter Rejection Bandwidth Verification Using Spectrum An
Detail how to configure RBW, VBW, and sweep settings to accurately measure stopband rejection depth and edge steepness per IEEE Std 145-2013.
Troubleshooting RF Amplifier Oscillation: 7 Diagnostic Steps
List oscilloscope and spectrum analyzer diagnostics—including bias network resonance checks, ground loop detection, and parasitic capacitance mitigation techniq
How to Calculate Link Budget for mmWave 28 GHz Point-to-Poin
Walk through a full link budget example including atmospheric attenuation, rain fade margin, antenna misalignment loss, and hardware impairments—using ITU-R P.6
5G NR Band n77 Filter Insertion Loss vs. Temperature: Real-W
Present thermal chamber test results showing insertion loss drift from −40°C to +85°C for BAW, SAW, and LTCC filters; include calibration methodology.
LoRa End Device Certification Paths: LoRaWAN 1.0.4 vs. 1.1 S
Break down device attestation, join server integration, and key management differences between LoRaWAN versions affecting regional certification (e.g., FCC ID,
Selecting the Right RF Mixer for LO Leakage-Sensitive Applic
Compare double-balanced vs. image-reject mixers for low-LO-leakage use cases (e.g., radar front-ends); reference measured data from Mini-Circuits, Marki, and Qo
RF Shielding Effectiveness Testing: MIL-STD-461G RE102 Compl
List test setup requirements (anechoic chamber, LISN, calibrated E-field probes), pass/fail thresholds, and common failure points for military-grade RF emission
RF Amplifier Gain Flatness Testing: Step-by-Step Lab Procedu
Explain how to measure and interpret gain flatness across frequency bands using VNA and signal analyzer setups; include pass/fail thresholds per MIL-STD-461G.
High-Frequency PCB Material Selection: Rogers RO4350B vs. FR
Compare Dk/Df stability, thermal expansion, copper adhesion, and cost impact on phase consistency and insertion loss in FMCW radar front-end boards.
RF Spectrum Monitoring for Interference Hunting: Real-Time F
Configure real-time spectrum analyzers (Keysight N9020B, R&S FSW) with optimal RBW, sweep time, persistence, and trigger modes to isolate intermittent GSM/Bluet
IQ Imbalance Correction in RF Transceivers: Digital Pre-Dist
Explain calibration workflows (tone injection, pilot tone analysis) and DSP algorithms to compensate for gain/phase mismatch in AD9361 and ADRV9009-based SDR pl
Secure NB-IoT OTA Firmware Updates: Delta, Rollback & AT Str
Engineering guide to signed delta updates, rollback protection, AT command sequencing, and fallback mechanisms for NB-IoT devices in carrier-assisted OTA deploy
RF Harmonic Suppression Filters: Designing 2nd/3rd Harmonic
Provide layout-ready filter topologies (LC ladder, stub-based) and simulation validation steps to meet FCC Part 15.247 spectral mask limits for ISM-band LoRa ga
RF Power Measurement Errors: Thermistor vs. Diode Sensors fo
Quantify amplitude error sources (temperature drift, frequency response nonlinearity, impedance mismatch) when measuring modulated 5G NR signals with diode and
RF Switch Selection Criteria: Isolation, Insertion Loss, and
Evaluate SPDT/SP4T switches (e.g., Qorvo QM11032, Broadcom AFEM-8072) for TDD FDD coexistence in C-Band 5G small cells using datasheet parameters and real-world
Antenna Matching Network Tuning: Vector Network Analyzer Wor
Step-by-step matching procedure—from initial Smith chart readout to iterative capacitor/inductor adjustment—using NanoVNA for PCB trace antennas on LoRa end-dev
RF Filter Selection Guide: BAW vs. SAW vs. LC for 5G Sub-6 G
Compare insertion loss, power handling, temperature drift, and package integration constraints of BAW, SAW, and miniaturized LC filters for n78/n79 band front-e
RF Over-the-Air (OTA) Testing Best Practices for mmWave 5G B
Detail chamber setup, probe calibration, beam sweep validation metrics, and uncertainty budgeting for 28/39 GHz phased-array antenna characterization in product
Low-Noise Amplifier Design Tradeoffs: NF vs. Gain vs. Input
Analyze real-world design compromises—using Qorvo QPL9057 and Skyworks SKY65111 as examples—for Wi-Fi/BLE receiver LNAs balancing noise figure, gain flatness, a
LoRa Network Planning Tool: Coverage Mapping with Path Loss
Demonstrate use of open-source tools (e.g., Radio Mobile) with ITU-R P.1546 models and DEM data to predict LoRa link budget over hilly agricultural zones.