Bends in Rectangular Waveguide Part II Full Bends & Mitre Bends

Bends in Rectangular WaveguidePart II Full Bends & Mitre Bends Simone Meschino Applied Electronic Dept. “Roma Tre” University

Full Bends Analysis H-plane Full-Bend Analysis: S11 and S21 vs. 100 mm  bending radius  850 mm and l_ref = 500 mm. E-plane Full-Bend Analysis: S11 and S21 vs. 100 mm  bending radius  850 mm and l_ref = 500 mm.

H-plane: Coupling : The better results occur for R_Bend = 500 mm. • S11 = - 50,3 dB • S21 = - 0,005 dB

E-plane: Coupling : The better results occur for R_Bend = 650 mm. • S11 = - 63,32 dB • S21 = - 0,002 dB

H-plane: • Simple Mitre Bend: l= 0; • Modified Mitre Bend: 0 < l < a/2 • w = a = 109,22 mm • 0,61 mm l  108,61 mm and l_ref = 500 mm. • E-plane: • Simple Mitre Bend: l= 0; • Modified Mitre Bend: 0 < l < b/2 • w = b = 54,61 mm • 0,305 mm l  52,45 mm and l_ref = 500 mm. Mitre Bends Analysis

H-plane: Coupling : The better results occur for l= 5 mm: • S11 = - 43,62 dB • S21 = - 0,93 dB

E-plane: Coupling : The better results occur for l= 23,5 mm: • S11 = - 15,84 dB • S21 = - 1,52 dB

Conclusions • full-bends • mitre bend The preliminary study of bends in rectangular waveguide involving both on E and H plane showed: the full-bend better satisfy the specifications in terms of S11 and S21 (expecially on E-plane). on H-plane, the mitre solution could be most suitable if it was possible to filter the TE01 and TE20 better than the TE11 and TM11¹. ¹ In general, mode filters show different performances when TEnm (TMnm) modes have n,m ≠ 0 or when n (or m) = 0

on E-plane, the mitre solution doesn’t show any advantages and, on the contrary, • it seems to be avoided. • P.S. The Study concerning S-Bends and Trapezoidal Bends will be available in the final report.

Bends in Rectangular Waveguide Part II Full Bends & Mitre Bends