Tunable microwave filters based on ferroelectric capacitors

Pleskachev, V.; Vendik, I.

doi:10.1109/crmico.2003.158898

Cited by 4 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…OIP3 results were presented for this technology in Ka-band. To the best of our knowledge, these results are the best loss results for tunable ferroelectric filters [8]- [11] in Ka-band and at room temperature. Also, the performances are better than those of the K-Band filters [6], [7] working at cryogenic temperatures.…”

Section: Oip3 Measurementsmentioning

confidence: 64%

See 1 more Smart Citation

A Ka-Band Electronically Tunable Ferroelectric Filter

Courrèges

Li²,

Zhao³

et al. 2009

IEEE Microw. Wireless Compon. Lett.

View full text Add to dashboard Cite

This letter presents a three-pole tunable Ka-band coplanar filter that includes six high-Q BST ferroelectric capacitors. It tunes from 29 GHz up to 34 GHz (17%) with low bias voltages ranging from 0 V to 30 V. The filter has fractional bandwidths of 9.5-12.2%. It has a good insertion loss for this category of Ka-band ferroelectric filters, which is between 6.9 dB (0 V) and 2.5 dB (30 V). Two tone measurements showed that the filter has a minimum OIP3 of 15 dBm between 0 V and 30 V. The highest OIP3 value is 26 dBm achieved at a dc bias of 30 V.Index Terms-Barium strontium titanate (BST).

show abstract

Section: Oip3 Measurementsmentioning

confidence: 64%

“…F ERROELECTRIC materials have become promising to provide electronically tunable microwave components for wireless front-end applications such as phase-shifters, antennas, oscillators and bandpass filters (BPF) [1]- [8]. Microwave filters, used in transceivers, belong to these fundamental circuits.…”

Section: Introductionmentioning

confidence: 99%

A Ka-Band Electronically Tunable Ferroelectric Filter

Courrèges

Li²,

Zhao³

et al. 2009

IEEE Microw. Wireless Compon. Lett.

View full text Add to dashboard Cite

show abstract

“…In the case of microwave frequency applications, performances in terms of frequency tunability and insertion loss are still not satisfactory. Again, most of the published papers concern BPFs utilizing localized element BST varactors [10][11][12][13][14][15][16] and only few are directly fabricated on BST layers [17][18][19]. In general, both circuit architectures suffer from high insertion losses and bandwidth variation with tuning as the tuning of resonance and interresonator coupling should be made in a synchronized way.…”

Section: Introductionmentioning

confidence: 99%

“…In general, both circuit architectures suffer from high insertion losses and bandwidth variation with tuning as the tuning of resonance and interresonator coupling should be made in a synchronized way. The first ones generally present higher tuning capabilities at low voltages with better insertion losses: up to 22% at 30 V with 5.4 to 3.3 dB insertion loss for the state-of-theart varactor-based BPF [14] compared to 7.7% at 150 V with 14.8 to 7.8 dB insertion loss for the best BST layer-based BPF [18]. However, varactor-based BPFs do not necessarily present better overall characteristics than fully distributed devices.…”

Section: Introductionmentioning

confidence: 99%

Fully Distributed Tunable Bandpass Filter Based on Ba0.5Sr0.5TiO3 Thin-Film S

Delprat

et al. 2011

International Journal of Microwave Science and Technology

View full text Add to dashboard Cite

This paper presents simulation and measurement results of fully distributed tunable coplanar bandpass filters (BPFs) with center frequencies around 6 GHz that make use of ferroelectric Barium Strontium Titanate (BaxSr1−xTiO3 or BST-x) thin film as tunable material. The two experimental bandpass filters tested are based on a novel frequency-agile structure composed of cascaded half wavelength slow-wave resonators (2 poles) and three coupled interdigital capacitors (IDCs) optimized for bias voltage application. Devices with gap dimensions of 10 and 3 μm are designed and fabricated with a two-step process on polycrystalline Ba0.5Sr0.5TiO3 thin films deposited on alumina substrate. A frequency tunability of 9% is obtained for the 10 μm gap structure at ±30 V with 7 dB insertion loss (the BST dielectric tunability being 26% with 0.04 loss tangent for this gap size). When the structure gap is reduced to 3 μm the center frequency shifts with a constant 9 dB insertion loss from 6.95 GHz at 0 V to 9.05 GHz at ±30 V, thus yielding a filter tunability of 30% (the BST dielectric tunability being 60% with 0.04 loss tangent for this gap size), a performance comparable to some extent to localized or lumped element BPFs operating at microwave frequency (>2 GHz).

show abstract

“…a good alternative to switchable filter banks by offering smaller size and lower power consumption and requiring a simpler and lower-cost process. Tunable filters for wireless front-end applications have already been demonstrated using RF-MEMS switches (Palego et al, 2008;Park & Rebeiz, 2008), ferroelectric capacitors (Pleskachev & Vendik, 2004;Papapolymerou et al, 2006;Feng et al, 2009), and PIN diodes (Rauscher, 2003). The performance of these reconfigurable circuits mainly relies on these tunable components, and frequency reconfigurable filters are particularly sensitive to loss.…”

Section: Interest Of Electronically Tunable Ferroelectric Filtersmentioning

confidence: 99%