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Compact Antenna Solution for V2X/CV2X Applications

Technology Overview

The design of a compact, wide-band antenna with omnidirectional radiation pattern is proposed. The antenna occupies a cylindrical volume and is composed of a conducting body of revolution, parasitic top ring shorted to the ground plane via a meander line, dielectric material and two parasitic metallic posts. The conducting body of revolution is employed to act as a wide-band feeding structure. The parasitic top ring with the meander line and the dielectric material are utilised to reduce the lowest frequency of operation hence size reduction is achieved. Detailed analysis of the antenna performance is provided with the help of vector surface current distribution. The proposed design provides a VSWR lower than 2.5:1 from 0.69 to 3.35 GHz with a bandwidth of 4.86:1. The antenna has a diameter of 0.115 λmax and height of 0.092 λmax, where λmax is the free-space wavelength at the lowest frequency of operation. An antenna prototype is designed, fabricated and measured. The measured VSWR is consistent with the simulated one. The measured maximum realised gain varies from 2 to 6 dBi. The total efficiency of the proposed antenna is above 80% within the operating band. By excluding the impedance mismatching, the simulated radiation efficiency is found to be above 93%. A good agreement is achieved between simulated and measured far-field radiation patterns.

Technology Features & Specifications

The antenna occupies a cylindrical volume and is composed of a conducting body of revolution, parasitic top ring shorted to the ground plane via a meander line, dielectric material and two parasitic metallic posts. The conducting body of revolution is employed to act as a wideband feeding structure. The parasitic top ring with the meander line and the dielectric material are utilised to reduce the lowest frequency of operation, hence size reduction is achieved.

Potential Applications

This novel design of compact wide-band monopole antenna should have a lot of applications in mobile communications as V2X and CV2X and in radar systems. The demand from industries is to have smaller antennas with wider bandwidth and higher gain. Our patent has provided an excellent opportunity for antenna designers to achieve a balance between antenna size and its performance.

Customer Benefits

  1. The antenna occupies very small volume compared to the existing designs.

  2. The antenna provides good matching for ultra-wideband frequency range.

  3. The measured realised gain is high.

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