Abstract
A high power microwave antenna based on the reflectarray concept is designed and investigated in this paper. The reflectarray aperture is directly driven by an azimuthally symmetric mode and a directional boresight beam is realized through azimuthally introducing a phase shift of 90 to the phase shift profile of reflectarray unit cells. A sample model operating at X-band is designed to verify the validity of the proposed approach. Variable diameter air-filled holes through a host dielectric material are exploited as the phase-shifting unit cells because of the advantage of higher power handling capacity. Theoretical analysis and full-wave simulations are accomplished and results are in good agreements. A collimated beam of circular polarization with peak gain of 20.2 dB and axial ratio of 1.3 are achieved at the boresight direction for the design frequency of 10 GHz. The radiation performance of the proposed antenna as well as its compact structure makes it a potential candidate for high gain high power applications.
Highlights
The demand for high power microwave (HPM) radiating systems is growing in recent years due to their broad applications in civilian and military systems [1]
Valsov antenna [6], COBRA antenna [7], high power radial line helical array antennas [8, 9], and high power microwave radial line slot antenna [10] are among the antenna structures designed for certain HPM applications
In the case of direct radiation of the azimuthally symmetric output modes of HPM sources, a doughnut-shaped pattern with a boresight null will be reradiated by the reflectarray aperture, which is undesirable for high power applications
Summary
The demand for high power microwave (HPM) radiating systems is growing in recent years due to their broad applications in civilian and military systems [1]. The power handling capability of the antenna becomes an important issue that must be addressed [2] This comes along with the output mode of many of the HPM sources has azimuthal symmetry (e.g. the TM01 circular waveguide mode or the TEM coaxial mode) [3], which generates a doughnut-shaped pattern with a boresight null, if radiated directly. In the case of direct radiation of the azimuthally symmetric output modes of HPM sources, a doughnut-shaped pattern with a boresight null will be reradiated by the reflectarray aperture, which is undesirable for high power applications. The results demonstrate the ability of the proposed antenna to be used for HPM applications
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
