Design of ultrawideband dual polarized linear phased array antenna

Date

2023-12-01

Author

Kaya, Şeyda

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Due to the demand for an ultrawideband dual polarized (horizontal and vertical) linear phased array antenna scanned only in one plane, the thesis study has been developed. Firstly, antenna types are investigated and Vivaldi antenna is chosen since it is an ultrawideband antenna if its opening is tapered appropriately. While Vivaldi antennas are suitable array elements for an array whose elements are placed along H-plane of them, they are not suitable for an array whose elements are placed along E-plane. This is because of the formation of grating lobes. To avoid grating lobes from entering the visible region, the antenna element spacing should be small enough. The small size of the Vivaldi antenna prevents appropriate opening and narrows down the operating bandwidth of the antenna by introducing mismatches in the lowest frequency band. Therefore, as a solution, a widely used concept is utilized for the array elements placed along E-plane, namely, tight coupling concept. As a result, a dual polarized array antenna has been developed with tightly coupled array antenna consisting of miniaturized antipodal Vivaldi antennas for horizontal polarization and traditional and wide antipodal Vivaldi antenna for vertical polarization. To verify the simulation results and to test the “tightly coupled Vivaldi array” concept, the designed horizontally polarized tightly coupled antipodal Vivaldi finite array with 8 elements is manufactured. This array could operate in 6-18 GHz and scan up to +40o from broadside with a worst measured average active scattering parameter value of -8.6 dB (VSWR < 2.18). Moreover, according to measurement results, the antenna array shows high gains between 8.47-14.32 dBi when scanning up to +40o.

Subject Keywords

Tight coupling, Vivaldi antenna, Array, Ultrawideband, Dual polarization

URI

https://hdl.handle.net/11511/107674

Collections

Graduate School of Natural and Applied Sciences, Thesis