engineering

Lan Jen Chu

Lan Jen Chu is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Lan Jen Chu rather than just read about it. In short: Lan Jen Chu (August 24, 1913 – July 25, 1973) was a Chinese-born American electrical engineer and a professor of electrical engineering at the Massachusetts Institute of Technology. Chu is noted for his work on the fundamental limitations for small antennas, also known as Chu–Harrington limit.

Key takeaways

Lan Jen Chu belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Lan Jen Chu to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Lan Jen Chu from memory before moving on to harder problems.

Reference excerpt

Lan Jen Chu (August 24, 1913 – July 25, 1973) was a Chinese-born American electrical engineer and a professor of electrical engineering at the Massachusetts Institute of Technology. Chu is noted for his work on the fundamental limitations for small antennas, also known as Chu–Harrington limit.

Biography Lan Jen Chu was born on August 24, 1913, in Huai'an in the Jiangsu province of China. He graduated from Shanghai Jiao Tong University in 1934 with a Bachelor of Science degree in electrical power, and went on to receive Master of Science and Doctorate of Science degrees in electrical engineering from MIT in 1935 and 1938, respectively. Chu was with the Radiation Laboratory at MIT from 1942 to 1946 and with the Department of Electrical Engineering from 1947 to 1973. He died on July 25, 1973, in Lexington, Massachusetts, and was survived by his wife Grace Feng and three children. During World War II, Chu supervised research at MIT of many special antennas for use in radar and telecommunication applications. In 1945, he acted as a United States Secretary of War and headed the advisory specialist group to United States Armed Forces in China. For his services, he received the President's Certificate of Merit. He has also authored three technical books, two of which were with Richard Adler and Robert Fano in the area of electromagnetics. Lan Jen Chu was a fellow of the American Physical Society and the Institute of Radio Engineers, as well as a member of Academia Sinica.

Publications

Books Adler RB, Chu LJ, Fano RM, Electromagnetic Energy Transmission and Radiation, MIT, 1968. Fano RM, Chu LJ, Adler RB, Electromagnetic Fields, Energy, and Forces, MIT, 1968. Stratton JA, Morse PM, Chu LJ, Hunter RA, Elliptic Cylinder and Spheroidal Wave Functions: Including Tables of Separation Constants and Coefficients, Wiley-MIT, 1941. Stratton JA, Morse PM, Chu LJ, Little JDC, Corbató FJ, Spheroidal Wave Functions: Including Tables of Separation Constants and Coefficients, MIT, 1956.

Book chapters Stratton JA, Electromagnetic Theory, Wiley-IEEE, 2007, pp. 464–470.

References

Illustrations

Worked examples

Example 1 — a first encounter with Lan Jen Chu

Start with the simplest possible case. Write down what Lan Jen Chu claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Lan Jen Chu before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Lan Jen Chu ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Lan Jen Chu

In research: Lan Jen Chu appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Lan Jen Chu in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Lan Jen Chu is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1913 births, 1973 deaths, 20th-century American engineers, so understanding it makes those chapters shorter.
In everyday life: Look for Lan Jen Chu outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Lan Jen Chu in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Lan Jen Chu means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Lan Jen Chu out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Lan Jen Chu in simple terms?

Why does Lan Jen Chu matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Lan Jen Chu?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Lan Jen Chu.