# RF Forum (rfforum.com)

> RF Forum is an independent, non-commercial, international online community for RF and microwave engineering. Engineers, researchers and students discuss RF circuit design, antennas and propagation, EM simulation, test and measurement, PA/LNA/mixers, wireless and satellite systems, components and interconnects, and microwave photonics / RF-over-fiber. English is the primary language; a Chinese Corner (中文交流) hosts discussion in Chinese. Content is strictly technical.

Canonical site: https://www.rfforum.com/
Contact: admin@rfforum.com

## Boards
- [RF Design & Circuits](https://www.rfforum.com/c/rf-design): Circuit design, matching, layout, oscillators and synthesizers
- [RF-over-Fiber & Microwave Photonics](https://www.rfforum.com/c/rfof): Analog optical links, RoF/RFoF, photonic signal generation and processing
- [Antennas & Propagation](https://www.rfforum.com/c/antennas): Antenna design, arrays, measurements, path loss and channel models
- [EM Simulation](https://www.rfforum.com/c/em-sim): Full-wave and circuit simulation: HFSS, CST, ADS, openEMS and more
- [Test & Measurement](https://www.rfforum.com/c/test): VNA, spectrum and noise measurements, calibration, fixtures and de-embedding
- [Components & Interconnects](https://www.rfforum.com/c/components): Connectors, cables, passives, filters, PCB materials and transmission lines
- [PA / LNA / Mixers](https://www.rfforum.com/c/pa-lna-mixers): Power amplifiers, low-noise amplifiers, mixers, linearity and DPD
- [Wireless & 5G/6G/Satcom](https://www.rfforum.com/c/wireless): Cellular, Wi-Fi, satellite, radar and link budgets
- [Learning & Careers](https://www.rfforum.com/c/careers): Study paths, books, interviews and career questions
- [中文交流 Chinese Corner](https://www.rfforum.com/c/chinese): 用中文讨论射频与微波技术 · Discussion in Chinese
- [Announcements](https://www.rfforum.com/c/announcements): Forum news, rules and feedback

## Key pages
- [Home](https://www.rfforum.com/): board overview and latest activity
- [Latest threads](https://www.rfforum.com/latest): all threads, most recently active first
- [About](https://www.rfforum.com/about): what RF Forum is and its principles
- [FAQ](https://www.rfforum.com/faq): joining, languages, posting rules
- [Contact](https://www.rfforum.com/contact): how to reach the forum team
- [Search](https://www.rfforum.com/search?q=): full-text thread search (e.g. https://www.rfforum.com/search?q=VNA)

## Recent discussions
- [LNA blocker desense: IIP3, gain compression and the front-end budget that datasheets skip](https://www.rfforum.com/t/77)
- [Measuring noise figure: Y-factor, cold source, and where the errors hide](https://www.rfforum.com/t/87)
- [5G RedCap RF requirements - simpler than eMBB?](https://www.rfforum.com/t/83)
- [DPD algorithms - memory polynomial vs neural network?](https://www.rfforum.com/t/82)
- [Microwave photonics primer: what it is and where it is used](https://www.rfforum.com/t/8)
- [Grounding strategy for mixed-signal RF boards](https://www.rfforum.com/t/86)
- [Directly modulated laser vs. external modulation (MZM) for analog links](https://www.rfforum.com/t/7)
- [RF-over-Fiber link budget: gain, noise figure and where RIN comes in](https://www.rfforum.com/t/6)
- [Phase noise basics: what L(f) means and how it limits your system](https://www.rfforum.com/t/5)
- [Why 50 ohms? The history and the trade-off behind the standard](https://www.rfforum.com/t/4)
- [Measuring very low phase noise without a dedicated analyser](https://www.rfforum.com/t/85)
- [Why your amplifier oscillates only with a particular cable attached](https://www.rfforum.com/t/84)
- [LNA noise figure - how low can you practically get at 2.4GHz?](https://www.rfforum.com/t/81)
- [PCB grounding for RF: via fences, return paths and split planes](https://www.rfforum.com/t/3)
- [Smith chart matching: a practical step-by-step workflow](https://www.rfforum.com/t/2)

## Machine-readable
- [Sitemap](https://www.rfforum.com/sitemap.xml): every board and thread URL with lastmod
- [robots.txt](https://www.rfforum.com/robots.txt)

Thread pages (https://www.rfforum.com/t/<id>) are server-rendered HTML with schema.org DiscussionForumPosting JSON-LD (author, dates, reply count, replies).