FIELD: measurement equipment.
SUBSTANCE: invention relates to instruments for borehole measurements, which are used for measurement of electromagnetic properties of an underground well. Instrument (100) of logging during drilling includes directional antenna of specific resistance and screen (150, 250, 350, 450, 550) of antenna. Screen (150, 250, 350, 450, 550) has at least one slot (160) having at least one electrically open end (165), which is formed in it. Screen (150, 250, 350, 450, 550) of antenna can include support section (170, 370) and a variety of equally spaced pins (172, 372) continued at the distance from support section (170, 370) so that ends (174, 374) of pins are electrically isolated from housing (110) of the instrument and from each other. As an option, screen (550) of antenna can include a variety of equally spaced plates (570) that are electrically isolated from housing (110) of the instrument and from each other.
EFFECT: proper physical protection of sensitive antenna elements.
16 cl, 9 dwg
