What is it about?

The research sought to provide an alternative approach to overcoming a challenge with Vivaldi antenna design. These antennas usually have very poor impedance matching at frequencies below 2 GHz and a mid-frequency gain drop; thus, making it difficult to implement in wideband communications. With the use of a two-stage quarter-wave feedline balun, the impedance was greatly enhanced. The antenna was implemented for dual-polarization using a known technique; where two identical vivaldi antennas are cross-shaped together into a single unit. This technique however creates another problem of mid-frequency gain drops due to airgaps trapped between the antennas. This was also corrected by sealing off the airgaps with silicone adhesive which corrected the gain problem. Measurement results are presented in this manuscript.

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Why is it important?

The designed antenna is currently being used as a test antenna in a Vehicle to Anything (V2X) communication facility for frequencies between 560 MHz through to 7.4 GHz. V2X communication is set to operate with the IEEE 802.11p and Cellular V2X (C-V2X) wireless standards. The antenna is capable of meeting the frequency and other electrical requirements for an efficient and cost effective measurement.

Perspectives

I strongly believe the ideas shared will be of great benefit to not only antenna researchers but also the general research community. The non-conventional methods we used to improve our gains and enhance the bandwidth is repeatable can be applied in related fields. Writing and publishing this was a great pleasure for my team and I.

Mr Philip Ayiku Dzagbletey
Seoul National University of Science and Technology

Read the Original

This page is a summary of: Quarter-Wave Balun Fed Vivaldi Antenna Pair for V2X Communication Measurement, IEEE Transactions on Antennas and Propagation, January 2019, Institute of Electrical & Electronics Engineers (IEEE),
DOI: 10.1109/tap.2019.2893201.
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