# Microwave measurement with Joel Dunsmore

- Show: [The Amp Hour](https://hardwarepodcasts.com/podcast/the-amp-hour)
- Published: 2021-03-08
- Length: 1h 21m
- Episode: 533
- Page: https://hardwarepodcasts.com/podcast/the-amp-hour/2021-03-08-microwave-measurement-with-joel-dunsmore
- Listen: https://theamphour.com/533-microwave-measurement-with-joel-dunsmore/

## Summary

Joel Dunsmore, a Keysight Fellow and original designer of the HP 8753 VNA, explains the evolution of vector network analyzers from single-box instruments to high-port-count modular systems. He details the critical role of calibration, error correction, and the physical realities of RF components like APC7 connectors and coaxial cables in achieving accurate measurements. The discussion covers modern challenges in 5G and SATCOM testing, including the use of multi-port analyzers for phased arrays and the integration of spectrum analysis capabilities within VNAs to improve manufacturing throughput.

## Chapters

- [0:00](https://hardwarepodcasts.com/podcast/the-amp-hour/2021-03-08-microwave-measurement-with-joel-dunsmore#t=0) Introduction: Joel Dunsmore and the HP 8753
- [1:58](https://hardwarepodcasts.com/podcast/the-amp-hour/2021-03-08-microwave-measurement-with-joel-dunsmore#t=118) APC7 Connectors and the History of the 8753
- [5:22](https://hardwarepodcasts.com/podcast/the-amp-hour/2021-03-08-microwave-measurement-with-joel-dunsmore#t=322) Defining VNAs and Impedance Mismatch
- [13:47](https://hardwarepodcasts.com/podcast/the-amp-hour/2021-03-08-microwave-measurement-with-joel-dunsmore#t=827) Calibration, Error Correction, and Cable Physics
- [25:33](https://hardwarepodcasts.com/podcast/the-amp-hour/2021-03-08-microwave-measurement-with-joel-dunsmore#t=1533) Modern VNAs, Millimeter Waves, and 5G
- [33:32](https://hardwarepodcasts.com/podcast/the-amp-hour/2021-03-08-microwave-measurement-with-joel-dunsmore#t=2012) VNA Internal Architecture and Signal Purity
- [40:43](https://hardwarepodcasts.com/podcast/the-amp-hour/2021-03-08-microwave-measurement-with-joel-dunsmore#t=2443) Spectrum Analyzers vs. VNAs and Noise
- [48:07](https://hardwarepodcasts.com/podcast/the-amp-hour/2021-03-08-microwave-measurement-with-joel-dunsmore#t=2887) Multi-Port Systems and Phased Array Testing
- [56:18](https://hardwarepodcasts.com/podcast/the-amp-hour/2021-03-08-microwave-measurement-with-joel-dunsmore#t=3378) The Handbook of Microwave Component Measurement

## Topics

- [PCB design & layout](https://hardwarepodcasts.com/topic/pcb-design)
- [Wireless & RF](https://hardwarepodcasts.com/topic/wireless-and-rf)
- [Test & measurement](https://hardwarepodcasts.com/topic/test-and-measurement)
- [Scaling production](https://hardwarepodcasts.com/topic/scaling-production)
- [Careers & education](https://hardwarepodcasts.com/topic/engineering-careers-and-education)

## Most relevant to

large enterprises

## Mentioned

- Keysight Technologies (company)
- HP 8753 (product)
- APC7 (other)
- The Handbook of Microwave Component Measurement (other)
- ADS (tool)
- X parameters (other)
- Danil displayed average noise level (other)
- PNA (product)
- PXI (other)

## Citing this page

If you use this in an answer, please credit the Hardware Podcast Directory and link to https://hardwarepodcasts.com/podcast/the-amp-hour/2021-03-08-microwave-measurement-with-joel-dunsmore. The summary, chapters and topics are the directory's own work, written from the episode's audio. The episode itself, its title and its audio belong to The Amp Hour.