Direct machined broadband corrugated horn array for millimeter observations

Shigeyuki Sekiguchi, Masahiro Sugimoto, Kenji Mitsui, Yoshiyuki Obuchi, Shibo Shu, Yutaro Sekimoto, Norio Okada, Kouichi Kubo, Toshikazu Takahashi, Tom Nitta,

Kenichi Karatsu, Masakazu Sekine, Agnes Dominjon, Masato Naruse, Takashi Noguchi

G3.7

Direct machined wide-band corrugated horn

• Observation for B-mode polarization of CMB • Simple plane corrugation design without ring

roaded structure • Horn was made of aluminum bulk at NAOJ

machine-shop. • Height : ~14.6 mm • Design frequency : 120 – 270 GHz

Horn simulation

120 GHz 180 GHz

240 GHz 270 GHz 210 GHz

150 GHz

• 120 – 270 GHz horn • Simulation using HFSS and CST software • Symmetric co-polarization • Low cross-polarization • Low return loss

80 – 180 GHz horn array • Scaling of 120 – 270 GHz horn • Good beam shape and return loss

120 – 270 GHz horn • Beam pattern and return loss have been

measured at room temperature. • Measurement results are consistent with

the simulation one.

Horn array MKID camera • Horn array camera connected horn array with broadband

planar OMT on SOI wafer is developed. (S. Shibo+ poster No. G2.18 ) • Multicolor band : 90 GHz , 150 GHz • The unnecessary part was caved to reduce the standing

wave and the weight.

• Horn array camera modules for LiteBIRD is also designed. (Y. Sekimoto+ poster No. G4.19, T. Matsumura+ Session5. on Thursday 23 )