Hollow-core　negative　curvature　fibers　can　confine　light　within　air　core　and　have　small　nonlinearity　and　dispersion　and　high　damage　threshold,　thereby　attracting　a　great　deal　of　interest　in　the　field　of　hollow　core　fibers.　However,　reducing　the　loss　of　hollow-core　negative　curvature　fibers　is　a　serious　problem.　On　this　basis,　three　new　types　of　fibers　with　different　nested　tube　structures　are　proposed　in　the　near-infrared　spectral　regions　and　compared　in　detail　with　a　previously　proposed　hollow-core　negative　curvature　fiber.　We　used　finite-element　method　for　numerical　simulation　studies　of　their　transmission　loss,　bending　loss,　and　single-mode　performance,　and　then　the　transmission　performance　of　various　structural　fibers　is　compared.　We　found　that　the　nested　elliptical　antiresonant　fiber　1　has　better　transmission　performance　than　that　of　the　three　other　types　of　fibers　in　the　spectral　range　of　0.72-1.6　mu　m.　Results　show　that　the　confinement　loss　of　the　LP01　mode　is　as　low　as　6.45x10(-6)　dB/km　at　lambda　=　1.06　mu　m.　To　the　best　of　our　knowledge,　the　record　low　level　of　confinement　loss　of　hollow-core　antiresonant　fibers　with　nested　tube　structures　was　created.　In　addition,　the　nested　elliptical　antiresonant　fiber　1　has　better　bending　resistance,　and　its　bending　loss　was　below　2.99x10(-2)　dB/km　at　5　cm　bending　radius.　(C)　2022　Optica　Publishing　Group　under　the　terms　of　the　Optics　Open　Access　Publishing　Agreement