DESIGN OF LENS ANTENNA WITH PLANAR ORTHOMODE TRANSDUCER FOR 28 GHZ FIXED SERVICE COMMUNICATION SYSTEMS

Introduction. Millimeter-wave frequency range can provide utilization of wide transmission frequency bands and therefore a significant increase of the capacity in modern communication systems. One of the main concerns in the design of the 27.5…29.5 GHz-wave communication system is a high gain antenna of the range of 30 dBi to compensate the significant level of radio signal attenuation in the communication channel compared to the traditional frequency bands below 6 GHz.
Objective. Development of the integrated lens antenna with the ability to operate on two orthogonal linear polarizations to separate the transmitted and received signals by polarization and, therefore, to create more efficient use of the spectrum. At the same time, an important task is to provide a high aperture efficiency of the antenna and a low level of insertion loss in the distribution system, which should have an interface based on printed transmission lines for connection to the radio frequency circuit elements realized on the printed circuit board.
Materials and methods. The main method of the analysis of the lens antenna characteristics is full-wave electromagnetic simulation in the computer-aided design system CST Microwave Studio. The results are confirmed with experimental samples measurement.
Results. The designed antenna is an integrated lens antenna consisting of a homogeneous semi-elliptical dielectric lens with a diameter of D = 120 mm with a cylindrical extension and a primary radiator based on a microstrip antenna with a waveguide adapter. Waveguide adapter radiating opening dimensions were optimized using an analytical method based on a combination of geometrical and physical optics. Two orthogonal polarizations are excited on the primary microstrip patch antenna with the corresponding closely spaced “H-type” slots in one internal metallization layer. According to experimental results, the designed antenna provides the gain level of 29.5…30.2 dBi with a halfpower beamwidth of 4.8…5.1 degrees and cross-polarization level exceeding 37 dB for both polarizations in the whole frequency band of 27.5…29.5 GHz.
Conclusion. The simplicity of the design, high aperture efficiency and the ability to operate on two orthogonal linear polarizations show that the developed lens antenna can be successfully used in radio communication systems of the 27.5…29.5 GHz frequency range.

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