Design of a two-section conical taper in circular waveguide system supporting the H₀₁mode

General Synthesis of Tapered Matching Sections for Single-Mode Operation Using the Coupled-Mode Theory

“…The average propagation constant, calculated by (31), for is ̅ ( = ) = 150.88 rad/m, while for is ̅ ( = ) =210.76 rad/m. Both Klopfenstein and Hecken tapers are synthetized by (17) and (18) respectively using the calculated values of ̅ , 0 ′ and . The coupling coefficient along the normalized position is depicted in Fig.…”

“…Tapers have been also widely studied and employed in microwave waveguide technologies, especially in rectangular and circular waveguides [15], [16]. Initially, simple tapers with linear profiles were proposed for circular (conical taper) [17] and rectangular waveguides (pyramidal taper) [18], [19]. The excitation of parasitic modes (including reflection) in linear tapers is often relatively high, and to reduce it the length of the taper must be increased often to large values.…”

“…The excitation of parasitic modes (including reflection) in linear tapers is often relatively high, and to reduce it the length of the taper must be increased often to large values. A better taper design was achieved by successive connection of several cones with different contour angles [20], [21]. However, when the number of conical sections employed is large, these tapers approach the superior nonlinear smooth tapers, where the contour angle is changed continuously.…”

Oversize Tubular Metallic Waveguides

“…Solymar has analyzed straight tapers for circular waveguides carrying the TE^i mode [25,[26][27][28], and for rectangular waveguides carrying the TE°0 mode [29]. In the case of circular waveguides of diameter, Z), carrying the TE^i mode, the tapers generate the TE$, spurious modes.…”

“…In the case of circular waveguides of diameter, Z), carrying the TE^i mode, the tapers generate the TE$, spurious modes. The normalized amplitude coupling coefficient, C, between the TEf*i and TE£ 2 modes at the output junction is given by [25] 4a is below cutoff for modes having n > 1, mode conversion loss occurs only at the junction with the output waveguide.…”