LOOP ANTENNA Russian patent published in 2008 - IPC H01Q7/00 

FIELD: recording and measuring sine-wave noise and pulsed magnetic fields at heavy noise, transmitting loop antennas.

SUBSTANCE: proposed loop antenna has multiturn loop disposed in multiturn screen made in the form of tube with transversal annular notch; contact member is electrically connected to finish of last turn of screen tube and affords electrical connection with finish of last turn of loop on one end and with start of first turn of tube, on other end; electric length of one part of multiturn screen equals that of other part of multiturn screen of loop; start of first turn of loop and respective start of first turn of tube form coaxial transmission line section which is connected to impedance transformer whose output functions as antenna output.

EFFECT: enlarged passband with negligible irregularity of amplitude-frequency response in operating frequency band, provision for cutting off high-level and low-frequency noise and for antenna output to asymmetric transmission line.

1 cl, 2 dwg