Abstract
A low-profile, compact and frequency-tunable antenna made on ferroelectric substrate is presented. It is designed as a planar dipole antenna with an IDC varactor integrated in the signal line. Antenna is fed through a coplanar waveguide matched to 50 Ω. The center frequency can be tuned from 6.895 GHz to 7.050 GHz. It exhibits elliptical polarization and omnidirectional radiation pattern.
Highlights
Nowadays Earth and space communication modules provide multiple services on different frequencies with constant demand for reduced dimensions of the communication devices
Lumped-element microwave circuits based on ferroelectrics are advantageous over the competing technologies, i.e., semiconductor varactors and micro-electro-mechanical systems (MEMS), in terms of space-radiation stability, reliability and their rapid response [5, 6]
High-density integrated circuits based on ferroelectric thin films with thicknesses below 1 μm can be produced on a single substrate, which increases the fabrication output and reduces the cost
Summary
Nowadays Earth and space communication modules provide multiple services on different frequencies with constant demand for reduced dimensions of the communication devices. A simple way to tune antenna is to load it with varactors. In the past years thin-film ferroelectric varactors have been extensively studied for possible use in frequency-agile microwave devices [3, 4]. Lumped-element microwave circuits based on ferroelectrics are advantageous over the competing technologies, i.e., semiconductor varactors and micro-electro-mechanical systems (MEMS), in terms of space-radiation stability, reliability and their rapid response [5, 6]. High-density integrated circuits based on ferroelectric thin films with thicknesses below 1 μm can be produced on a single substrate, which increases the fabrication output and reduces the cost. This paper presents a novel antenna architecture with integrated ferroelectric varactor, which was designed to manufacture a simple yet efficient tunable antenna. Antenna is fed through a coplanar waveguide (CPW) loaded with an interdigital (IDC) varactor made on Ba0.3Sr0.7TiO3 thin-film substrate. The photography of the fabricated antenna and the optical micrograph of the IDC varactor are shown in Fig. 2(a) and (b), respectively
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