A circularly polarized TEM to TE ₁₁ mode converter antenna

Abstract

A design and simulation of the mode converter antenna (MCA) with right-hand circular polarization, at 10 GHz frequency, is presented. The circularly polarized mode converter antenna (CPMCA) consists of two inner conductors and a body. The TEM mode is converted into a circular polarization TE 11 mode, using the inner conductors connecting the coaxial waveguide in two vertical and horizontal directions. The sidelobe level is less than −15 dB at the working frequency. The S11 and axial ratios of the CPMCA are about −16.5 and 0.15 dB, respectively. Also, the axial ratio is in the acceptable range.

An only metal, compact, and circular polarizer designed with helical array rods

“…In a circular waveguide, the TE 11 mode is the dominant or fundamental mode. Additionally, the output mode is CP-TE 11 of a circular waveguide [18][19][20]. In the proposed CPW, several metal rods are placed inside the simple circular waveguide.…”

“…To generate a CP field, it must be equally excited in two perpendicular axes (for example, X and Y ). This issue alone will not be enough to generate a CP field, but the phase difference between the two excited fields in the X and Y directions must be 90° [2–23]. If the phase difference is zero degrees, the polarization will be slant.…”

Compact Efficient and Frequency Tunable Relativistic Magnetron With Reducing Coaxial Section and Tilted Tuners

“…On the band which concerns us, the gain achieved by this antenna is about 20 dB. To fit the RM output coaxial waveguide and the conical antenna, a mode converter from TEM to TE 11 has also been designed, from [34] and [35]. This choice was made because of the need to experimentally position a receiving horn at several meters, in the axis of the antenna.…”

An Only Metal, Compact, and Circular Polarizer Designed with Helical Array Rods

“…In a circular waveguide, TE 11 mode is the dominant or fundamental mode. Also, the output mode is CP-TE 11 of a circular waveguide [18][19][20][21][22]. In the structure, inside the simple circular waveguide, several metal rods are placed.…”