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This paper discusses the development of a compact light-weight planar spiral antenna for use in amplitude comparison and interferometer direction finding (DF) applications covering 1 to 18 GHz. The antenna uses a slow-wave (zigzag) spiral radiator which results in a cavity diameter which is only 68% of the wavelength at 1 GHz. The two-arm spiral is fed by a Marchand balun and achieves a VSWR of less...
This paper presents design considerations and measured results for a two element 8 to 12 GHz horn antenna array for transmit/receive applications requiring high isolation. Circular polarization is achieved by incorporating a five layer meanderline circular polarizer over the aperture of the horn antenna. The measured axial ratio for operational antennas including protective radomes is less than 0...