Overview
Shintaro Uda (1896–1976) carried out the experiments at Tohoku Imperial University that established how parasitic elements placed near a driven dipole produce directional gain. The antenna is the Yagi-Uda; in English it is usually just "the Yagi". He is in this corpus as the clearest small-scale illustration of how publication language allocates credit.
What You Need
- Lived: 1896–1976, Japan
- Anchor year: 1926 — the experimental work
- Strand: overlooked — the name that dropped off
Steps
The problem as it stood
The idea that a nearby conductor might re-radiate and shape a pattern was not, by itself, enough. What lengths? What spacings? How many? Without answers the concept is not an antenna design, and answering them meant systematic measurement at short wavelengths in the 1920s.
What he actually did
Uda ran the experimental programme, publishing a series of papers in Japanese from 1926 that worked out the behaviour of reflectors and directors and the effect of varying their length and spacing. This is the work that turned the principle into something an engineer could build to specification.
How it worked
The measurements established the sensitivity of the design to element length and spacing — that a director must be shorter than the driven element and a reflector longer, and roughly by how much. That is the difference between a physical curiosity and a manufacturable component.
What it made possible
A design specification that could be reproduced anywhere, which is why the antenna spread so fast once Yagi published it in English. Uda continued in antenna research and became a professor at Tohoku.
What happened to him
He remained an academic in Japan and published extensively in Japanese. He and Yagi both died in 1976. In Japan the joint attribution is standard; in English it usually is not.
Where the credit landed
Uda published first, in Japanese, from 1926. Yagi published in English in 1928 and held the patent. Yagi credited Uda, and the correct name of the design has always been the Yagi-Uda. The shortening to "Yagi" happened in Anglophone usage, not by either man's doing. This is the linguistic erasure mechanism operating on someone who was neither obscure nor uncredited — merely publishing in the wrong language for posterity.
Pro Tips
- Uda published first; Yagi published in English.
- Working out the dimensions is the engineering — the concept alone is not a design.
- Correct usage is Yagi-Uda.
Knowledge Base
What You'll Learn
Uda is the control case for the corpus's claims about language and credit.
Why this one is unusually clean
Most erasure in this corpus involves a corporation, a contract or a patent fight. Here there was none of that: no employer absorbed the work, no anonymity clause applied, and the senior colleague actively credited the junior one. The name still dropped out of English usage. That makes Uda useful evidence that language alone is sufficient to erase a contributor.
Where This Fits
This guide covers one specific part of the history of media technology. The wider picture — how each link in the chain from capture through transmission to display was actually built, who built it, and why the credit so often landed somewhere else — is in A History of Broadcast Technology: The Chain From Capture to Screen, which frames the discipline as a whole and links out to the detailed guides underneath it, including this one. If you are starting from scratch rather than solving a specific problem, read that first and come back here.
FAQ
Q: Did Yagi take credit for Uda's work?
A: No. Yagi credited Uda, and the design has always properly been called the Yagi-Uda antenna. The shortening to "Yagi" is a feature of English-language usage rather than an act by either man.
Q: What did Uda contribute specifically?
A: The experimental programme, published from 1926, establishing how parasitic reflectors and directors behave and how element length and spacing determine the pattern — the work that made the design reproducible.