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Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Why?

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Regards.

EDIT: cross-posted with gophert.
 
The impedance of the end of a grounded quarter wave stub is theoretically infinite.

With eg. a half wave dipole (with grounded centre point), you can pick any feed impedance you want by moving closer to the centre [= lower impedance] of further from the centre [= higher impedance].
 

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