slotted section

slotted section

[′släd·əd ‚sek·shən]
(electromagnetism)
A section of waveguide or shielded transmission line in which the shield is slotted to permit the use of a traveling probe for examination of standing waves. Also known as slotted line; slotted waveguide.
References in periodicals archive ?
The unit will cater for both singles and LP's and the lid can be closed whilst playing LP's thanks to the slotted section.