Analysis of new active antenna with a patch as feed-back network, using the NDF Method

ABSTRACT

This paper shows the design of an active patch antenna. First, an analysis of the electric field inside the patch is performed to determine the compatibility of the modes of the patch with the desired feeding. The desired feeding is as a serial two-port resonator, so the suitable mode is the “Mode 1”. Then a linear analysis of the active antenna is performed. In this particular example, it is possible to use the classic Loop Gain Method, but its use is not guaranteed. So, the proposed NDF Method is used because it is independent of the oscillator topology and it is valid without any restriction or proviso. Then a Harmonic Balance analysis is performed and the results are compared with the measurements of a prototype.

AMS SUBJECT CLASSIFICATIONS:

• NDF
• patch antennas
• active antennas
• oscillators
• Loop Gain
• stability criteria
• feed-back

Acknowledgements

Thanks to the “Consejería de Educación, Juventud y Deporte, Comunidad Autónoma de Madrid” and to the members of the “S2013/ICE-3004 DIFRAGEOS” (Desarrollos instrumentales fotónicos y de radiofrecuencia y aplicación a técnicas experimentales de Geodesia Espacial) project.

Notes

No potential conflict of interest was reported by the authors.