Abstract
This research presents the design and main electromagnetic characteristics of the novel compact microwave waveguide polarizer. The developed device's structure is based on a circular waveguide and anti-phase conducting posts located in it. The application of a circular waveguide instead of a square one allowed simple integration of a polarizer with corrugated horn antennas. The obtaining of required phase difference using a posts-based design provides the possibility of fine tuning of the developed circular waveguide polarizer after its manufacturing process. In addition, simultaneous adaptive operation at orthogonal circular and linear polarizations is available in the antenna system including a polarizer with posts. An automatic control of posts height must be applied in a waveguide in order to provide this option. Numerical simulation, optimization, manufacture and measurements of the polarizer's characteristics were carried out in the operating band 7.4-8.5 GHz. Measured characteristics proved that the suggested circular waveguide polarizer provides good matching and polarization performance. Developed circular waveguide polarizer can be integrated in corrugated horn antenna systems and applied in modern weather radars and satellite information systems.
Highlights
Electromagnetic waves can possess various types of polarizations [1]
The separation of signals with perpendicular linear polarizations is carried out using orthomode transducers [19]-[23] in such antenna systems
OF THE OPTIMIZATION OF WAVEGUIDE POLARIZER CHARACTERISTICS This section presents the optimized for operating X-band design of a circular waveguide polarizer with 3 antiphase posts
Summary
Electromagnetic waves can possess various types of polarizations [1]. Elliptical polarization is the most common type and it is encountered most frequently in different radio links, systems and antennas. Signals, which are carried by the electromagnetic waves with orthogonal linear or circular polarizations, allow to double the volumes of transmitted information in telecommunication and other systems [2]. Process and transmit to isolated channels the signals with orthogonal polarizations a specific types of modern antennas and microwave devices for their feeding are utilized [8]-[18]. The separation of signals with perpendicular linear polarizations is carried out using orthomode transducers [19]-[23] in such antenna systems. Orthomode transducers are developed based on the waveguide turnstile junctions [19], [20], on the ridged waveguides and structures [9]-
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