Considering　the　low　loss　transmission　and　commercialization　of　hollow　core　fiber,　negative　curvature　hollow　core　fiber　(NC-HCF)　has　become　a　research　hotspot　in　recent　years.　We　report　an　innovative　NC-HCF　with　an　antiresonant　layer　inside　the　cladding　tubes　based　on　semi-ellipse　and　semi-circle　structures.　Based　on　the　COMSOL　simulation,　it　exhibits　an　ultra-low　loss　from　0.6　to　1.6　mu　m　transmission　band.　On　the　one　hand,　as　for　semi-ellipse　and　semi-circle　with　antiresonant　layer　structure,　the　fiber　lowest　confinement　loss　(CL)　of　LP01　mode　reaches　a　lowest　value　of　7.608　x　10(-4)　dB/km　at　0.78　mu　m,　and　the　high-order　mode　suppression　ratio　(HOMER)　value　can　reach　4069.　On　the　other　hand,　the　semi-circle　and　semi-ellipse　with　antiresonant　layer　fiber　structure　shows　the　lowest　CL　of　1.675　x　10(-4)　dB/km　at　0.79　mu　m,　and　the　value　of　HOMER　is　1776.　Moreover,　based　on　the　fabrication　tolerance　analysis,　the　hollow　core　fibers　proposed　indicate　better　performance.　(C)　2022　Society　of　Photo-Optical　Instrumentation　Engineers　(SPIE)