# S-Parameter Design Tool

> S-Parameter Design Tool (iPhone/iPad app by Clive Poole.)

- Source: https://appshunter.io/ios/app/s-parameter-design-tool/id6770232148 (this page in markdown: same URL + `.md`)
- Developer: [Clive Poole](https://appshunter.io/developer/1896714663)
- Category: Education, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 26.5 · 1 MB
- Languages: American English
- Released: 2026-05-21
- Data updated: 2026-06-19
- User reviews in markdown: https://appshunter.io/ios/app/s-parameter-design-tool/id6770232148/reviews.md

## What is S?

The S-Parameter Design Tool is an S-parameter analysis tool for RF and microwave engineers. Just enter your transistor's S-parameters, choose the device configuration and feedback termination (if any) and the app will compute stability factors, simultaneous conjugate match points, and maximum available gain — all displayed on an interactive Smith chart.

Features:
• S-parameter entry in magnitude/angle, real/imaginary, or dB/angle format
• Common-emitter, common-base, and common-collector configuration conversion
• Series and shunt feedback analysis
• Stability analysis: Rollett K-factor, µ1/µ2, stability circles
• Smith chart and polar plot display
• Results export as CSV

This is a companion App to the website tool: https://www.clivepoole.com/s-parameter-design-tool/
All based on our Book: “Microwave Active Circuit Analysis and Design” by C. Poole and I Darwazeh, Elsevier 2015, ISBN 13: 9780124078239.


## Version history (last 2 releases)

### 1.0.1 — 2026-05-30

Technical update for App Store compliance.

### 1.0 — 2026-05-19

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-19.*