Circularly Polarized Antenna System for the Quality Evaluation Application of Apple Fruit

This paper presents the Omnidirectional Circularly Polarized Antenna for the quality assessment applications of Apple samples. The Compact rectangular 2x2 antenna array is designed with a Band pass filter for the triple-band microwave sensing at 2.4/3.5/5.8 GHz. The Micro strip Antenna senses the spectrum of the signal produced from the apple sample for quality evaluation. The antenna comprises back-to-back micro strip patches fed by a 50 ohm impedance matching. A frequency ratio for the antenna design is achieved greater than 3 dB, which can be tuned for triple frequencies. An analysis of omnidirectional circular polarization mechanism, Gain, Directivity, Efficiency and Radiated Power Vs Frequency, Radiation Intensity Vs Magnitude of micro strip patch antenna as well the triple-band operation is achieved with numerical and experimental data. The proposed Omnidirectional Circularly Polarized antenna provides 15 dB for triple frequency bands.