ABSTRACT:
An elliptically polarized frequency-agile antenna on a ferroelectric substrate
The requirements for the modern communication modules are challenging as they have to cover multiple services at different frequencies, requiring several antennas to be placed in a small housing. A frequency-agile antennas loaded with varactors with circular polarization can seamlessly cover a wide frequency range. An antenna design with an integrated ferroelectric varactor have advantages over the main competing technologies, i.e., semiconductor varactors and micro-electro-mechanical systems (MEMS). A dipole antenna fed through a coplanar waveguide (CPW) loaded with an interdigital (IDC) varactor made on a Ba0.3Sr0.7TiO3 thin-film substrate has a tunable central frequency and elliptical polarization.