The distortion in a horn simply,and an example of a constant directivity horn are discussed,which gives an actual measured polar response,beam width at horizontal & vertical axis,the relation among directivity factor,and directivity index & frequency.

The application of polar coordinates in the transition curve;

Path Planning Based on the Polar Coordinates,Grids,and Fuzzy Controller;

Calculation method of the skew bridge in the polar coordinates;

The study of machining cam in polar coordinates;

Study on the Control System and Movement Control of Polar Coordinate NC Machine;

Under the control of MCS-51 SCM (single chip machine), the polar coordinates are used in the common milling machine to complete the machining of cam whose precision is ±0.

A method of measuring contrate involute errors of double gears, gear shapers and gear shavers on the CZ450 gear integrated error tester using the polar coordinate method is introduced.

A polar coordinate method for determining all the points on the sectional line in the expansien figure of curved surface,is presented in the paper.

It also discussed how to implement road construction survey and staking-out using polar coordinate method.