A tunable slot loop antenna using interdigitated ferroelectric varactors

Abstract

A tunable slot loop antenna loaded with interdigitated ferroelectric varactors at multiple positions is designed, fabricated, and measured. Measurement results show that the resonant frequency of the proposed antenna can be tuned from 15.18 GHz to 15.36 GHz as the bias voltage is increased from 0 V to 39 V.

K x Na1−xNbO3 perovskite thin films grown by pulsed laser deposition on R-plane sapphire for tunable microwave devices

“…Indeed ferroelectric thin films exhibit a high dielectric permittivity ε r which can be controlled by an external static electric field, promoting both miniaturized and reconfigurable microwave devices. Besides the most popular ferroelectric materials, namely Ba x Sr 1-x Ti x O 3 (BST) [8,9] and PbZr 1-x Ti x O 3 (PZT) [10,11], the lead-free potassium niobate family presents relevant features [12][13][14].…”

Elliptically polarized frequency agile antenna on ferroelectric substrate

“…Consequently, currents flowing into the antenna though the signal line and out of the antenna through the ground plane do not cancel each other out. Antenna is therefore radiating not only from its horizontal parts, as could be expected for a dipole antenna, but also from Compared to the existing literature data on tunable antennas based on BST-film varactors, the 3 % tuning of resonant frequency at 50 V exceeds the values reported for slot loop antennas, for which either 3 % or 1 % tuning was achieved with 200 [9] and 40 V bias [10], respectively. However, it is inferior to the 8 % tuning achieved with 10 V in Bowtie antenna with three IDC varactors integrated in the feed line [11].…”

Frequency-Tunable Slot-Loop Antenna Based on KNN Ferroelectric Interdigitated Varactors

“…The antenna was designed to operate at Ku-band. Its layout (inspired from [8], [9]) and cross-section view are reported in Fig. 1a and 1b respectively.…”

“…Among the examples, in 2012, H.-Y. Li et al introduced a slot-loop miniature tunable antenna with BST-based interdigitated varactors and operating close to 15 GHz [8]; such antenna exhibited a 1%-frequency tunability rate under 195 kV/cm dc bias electric field. To increase the tunability rate, this group proposed slot-loop miniature tunable antennas based on MIM varactors operating at C-and X-bands [9], [10].…”