Abstract
In this paper, a circularly polarized Transmitarray antenna design for the Ku-band frequency range is presented. The transmitarray antenna with 121 elements is designed using a four-layer double square ring with a center patch unit cell. The Unit cell parametric analysis shows a high transmission coefficient magnitude of −1.26 dBi and a wide phase range of 256 degrees. A meander line polarizer is designed at 12GHz to convert the polarization from linear to circular. This meander line polarizer is placed in front of the horn antenna as a superstrate layer. The final measurement results show a high gain circular polarized TA antenna with a maximum gain of 20.17dBic and a value of 1.89 for the axial ratio is achieved at 11.2 GHz. The 1dB antenna gain and 3-dB axial ratio bandwidth are calculated as 0.65GHz and 1.07GHz, respectively. The proposed design offers a low profile and less complex structure, making it suitable for long-range communication systems, especially in Ku band applications.
Highlights
Over the years, there has been an increasing interest in Ku band [1] satellite services, including the broadcast of digital TV, radio, and broadband internet [2]
Among the different configurations used for designing transmitarrays, the most commonly used are metamaterial, receiver-transmitter, and Frequency Selective Surface (FSS) types
Metamaterial transmitarrays use the principle of changing material properties, i.e., permittivity and permeability, to change the unit cell phase [7, 9,10,11]
Summary
There has been an increasing interest in Ku band [1] satellite services, including the broadcast of digital TV, radio, and broadband internet [2]. Different types of unit cell shapes have been implemented in FSS transmitarrays to increase the bandwidth, reduce the insertion loss, control the beam steering, and adjust the reconfigurability from linear to circular polarization. The sequential rotations of unit cell patches and interconnection vias make the fabrication and assembling process difficult Another method uses a polarizer with dual-linear elements to implement the circularly polarized transmitarray [26]. Another design using sequential and random rotations of unit cells in a receivertransmitter configuration is implemented [27]. We use the meander line polarizer as a superstrate structure to convert linear polarization to circular polarization The advantage of this structure is that we can produce high gain TA with minimum insertion loss. This structure provides a low-profile and less complex design compared to other transformation methods
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