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International Journal of Antennas and Propagation
Volume 2014, Article ID 479189, 6 pages
Research Article

Radiation Characteristics of 3D Resonant Cavity Antenna with Grid-Oscillator Integrated Inside

1Department of Radio Engineering, Technical University of Varna, 9010 Varna, Bulgaria
2Departamento de Electrónica, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso, Chile

Received 17 July 2013; Accepted 1 December 2013; Published 16 January 2014

Academic Editor: Ahmad Safaai-Jazi

Copyright © 2014 L. A. Haralambiev and H. D. Hristov. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A three-dimensional (3D) rectangular cavity antenna with an aperture size of 80 mm 80 mm and a length of 16 mm, integrated with a four-MESFET transistor grid-oscillator, is designed and studied experimentally. It is found that the use of 3D antenna resonant cavity in case of small or medium gain microwave active cavity antenna leads to effective and stable power combining and radiation. The lack of lateral cavity diffraction and radiation helps in producing a directive gain of about 17 dB and radiation aperture efficiency bigger than 75% at a resonance frequency of 8.62 GHz. Good DC to RF oscillator efficiency of 26%, effective isotropic radiated power (EIRP) of 5.2 W, and SSB spectral power density of −82 dBc/Hz are found from the measured data. The 3D antenna cavity serves also as a strong metal container for the solid-state oscillator circuitry.