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Broadband Ku Band Horn

A smooth-walled multi-mode horn(Figure 1) with a multi-step mode generator was optimised using a modal matching program(optrtcc). The design aim was to achieve lowest peak crosspolar in the main beam from 10.7 GHz to 14.5 GHz while retaining the conical flare. A similar horn had been designed for J band in the reference [1] given below. Predicted peak cross-polar level vs frequency plot is shown below in Figure 2. Like wise The return loss plot is shown in Figure 3. Predicted far-field patterns in Rx at 10.7 GHz, 11.3 GHz and 12.8 GHz are given in Figure 4, Figure 5, Figure 6. Predicted far-field patterns in Tx at 13.7 GHz and 14.5 GHz are given in Figure 7, Figure 8. Note that the sidelobe levels are generally higher in Tx.

Figure 1

FIGURE 1: Optimised Ku Horn Profile.

Figure 2

FIGURE 2: Predicted Peak cross-polar vs Frequency.

Figure 3

FIGURE 3: Predicted Return Loss vs Frequency.

Figure 4

FIGURE 4: Predicted Far-field Patterns at 10.7 GHz.

Figure 5

FIGURE 5: Predicted Far-field Patterns at 11.27 GHz.

Figure 6

FIGURE 6: Predicted Far-field Patterns at 12.79 GHz.

Figure 7

FIGURE 7: Predicted Far-field Patterns at 13.74 GHz.

Figure 8

FIGURE 8: Predicted Far-field Patterns at 14.5 GHz.

Reference 1: Tun,S.M, .Foster, P.R. , 'Computer optimised wideband dual-mode horn', Electronics Letters, Vol.38, No.15, July 2002, pp. 768-769.

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