Abstract
The study presented aims to design a new patch antenna with improved bandwidth and effective rejection of spurious modes and harmonics. This design contains two λ/4 resonators that are closely connected to a circular ring patch. The proposed antenna exhibits wide bandwidth due to dual resonances created by means of a novel ring-shaped radiating patch with a decagonal-shaped inner ring and non-radiating λ/4-length resonators. The decagonal shape’s unique geometry optimizes electromagnetic field distribution, enhancing control over radiation patterns and impedance matching. This design choice distinguishes the antenna from traditional circular patch antennas, as it effectively addresses the challenge of spurious modes and harmonics. This dual-resonance patch antenna design is distinctive because it does not require an electrically thick substrate. The resonators and the proximity feeding system are essential in efficiently minimizing the emission of harmonic radiating modes. This decrease is important for today’s requirements for the level of integration with various types of communication systems. A prototype antenna was designed and fabricated to work at 2.4 GHz. The simulated and measured results of the designed and fabricated antenna show that the antenna’s bandwidth is seven times greater than that of a traditional circular patch antenna. Additionally, it efficiently reduces the emission of unwanted radiation from higher-order modes. This antenna will be utilized in devices designed for the purpose of capturing RF energy and wireless power transfer.
Keywords: Circular Patch Antenna, Decagonal Shape, Harmonic Suppression, Microstrip Patch Antenna, Partial Ground Plane, /4 Resonator.