Journal
APPLIED SCIENCES-BASEL
Volume 10, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/app10103474
Keywords
photomixer; photonic antenna; PCB antenna; E-band; beam scanning; beam steering; probe de-embedding; leaky-wave antenna; epoxy bonding; RF choke
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Funding
- Labex CominLabs
- European Union through the European Regional Development Fund (ERDF)
- Ministry of Higher Education and Research
- Rennes Metropole
- Conseil Departemental 35, through the CPER Project SOPHIE/STIC
- Ondes
- European Union [642355 FiWiN5G]
- Spanish Ministerio de Economia y Competitividad through Programa Estatal de Investigacion, Desarrollo e Inovacion Orientada a los Retos de la Sociedad [TEC2016-76997-C3-3-R]
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This manuscript reports the first leaky-wave antenna (LWA) array excited by a photomixer as well as its potential application for alignment in wireless links. The designed array is manufactured in printed circuit board (PCB) technology, works at the E-band (from 75 to 85 GHz), and provides a directive beam of about 18 dBi with a frequency scanning span of 22 degrees. The antenna element consists of a microstrip line periodically loaded with stubs, and it has been designed employing a hybrid approach combining full-wave simulations and transmission line theory. This approach enables the optimization of the periods when the open-stopband of the LWA is mitigated or removed at the frequency of broadside emission. The proposed antenna was first tested using a ground signal ground (GSG) probe; the measured return loss and radiation patterns of the fabricated prototype were in good agreement with full-wave simulations. Then, the LWA array was integrated with the photomixer chip using conductive epoxy threads. Measurements of the radiated power yielded a maximum of 120 mu W at 80.5 GHz for a 9.8 mA photocurrent. Finally, the antenna was used in a 25 cm wireless link, obtaining a 2.15 Gbps error-free data rate.
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