Figure 8

Figure 8 Simulated and measured normalized radiation patterns at 4.35 GHz: (a) xoz plane and (b) yoz plane.

Discussion

A comparison of the antenna described in this work with selected referenced antennas is presented in Table 2. With respect to the horn antennas with SRRs or via holes,16-18 this antenna provides dual-band operation as well as filtering. This MTM horn antenna without additional filters demonstrates a remarkable filtering response, resulting in a smaller size compared with the one using two different filters.21

Table 2

Furthermore, a coaxial coupler and waveguide coupler are separately used as output structures in two kinds of backward wave oscillators.25,26 In this work, the dual-band antenna combines the two coupling technologies; coaxial coupling and waveguide coupling are used to feed the antenna and connect to the horn aperture.

CONCLUSION

An MTM is used to construct a dual-band filtering horn antenna. The MTM antenna exhibits dual-band operation and filtering performance, as demonstrated by simulation and measurements. Maximum realized gains are approximately 6.5 and 9.5 dBi in the two passbands, respectively. The MTM horn antenna exhibits excellent filtering performance as well. This work offers a promising approach for the design of horn antennas with dual-band filtering response.

Acknowledgment

This work was supported in part by the National Natural Science Foundation of China under Grant no 62301459.

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