A first‐harmonic push–push oscillator based active integrated dual‐beam switchable array antenna

Abstract

This paper proposes a new active integrated array antenna (AIAA) for dual-beam switchable functionality. The proposed AIAA comprises a first-harmonic push–push oscillator, four linearly polarized microstrip antennas, and a switchable feed network. The first-harmonic push–push oscillator eliminates the impact of load variation and usage of a filter to suppress the second- and higher-harmonic frequency signals. By using the switchable feed network, the main beam direction of the radiation pattern can be switched between two states, i.e. θ = ± 10 ∘ $\mathbf {\theta = \pm }10\mathbf {^{\circ }}$ . The performance of the proposed antenna is experimentally evaluated. The measured results show an effective isotropic radiated power (EIRP) of +27.5 dBm, DC-to-RF efficiency of 20.26%, and figure of merit (FOM) of −155.2 dBc Hz−1 at the fundamental frequency of 5.9 GHz.