High performance balanced type SAW filters in the range of 900 MHz and 1.9 GHz

Endoh, G.; Ueda, Masahiko; Kawachi, O.; Fujiwara, Y.

doi:10.1109/ultsym.1997.662976

Cited by 12 publications

(4 citation statements)

References 3 publications

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“…FBAR has the potentiality of a monolithic device with IC. SAW has the merit of easily designing a balance-unbalance filter using a double mode SAW (DMS) filter 37,38) widely used in cellular phones.…”

Section: Competition and Coexistence Between Fbar And Saw Filtersmentioning

confidence: 99%

Development of Piezoelectric Thin Film Resonator and Its Impact on Future Wireless Communication Systems

Satoh

Nishihara

Yokoyama

et al. 2005

Jpn. J. Appl. Phys.

130

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The bulk acoustic wave filter composed of piezoelectric thin film resonators has many features superior to those of other small filters such as a surface acoustic wave (SAW) filter and a ceramic filter. As it has no fine structure in its electrode design, it has a high Q factor that leads to low-loss and sharp-cut off characteristics and a high power durability particularly in the highfrequency range. Furthermore, it has the potentiality of integrated devices on a Si substrate. In this paper, we review the recent developments of piezoelectric thin film resonator filters in the world, including our development for mobile communication applications. After describing the feature and history of the piezoelectric thin film resonator filters, our technologies are introduced in focusing on the resonator structures, the piezoelectric thin film and electrode film materials, the cavity structures, the filter structure and its design rules and characteristics, comparing with SAW filters. The competition and coexistence between the piezoelectric thin film resonator filters and the SAW filters are also described. In this paper, we describe the development of a piezoelectric thin film resonator from the standpoint of researchers who have a long experience of SAW filter development.

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Section: Competition and Coexistence Between Fbar And Saw Filtersmentioning

confidence: 99%

Development of Piezoelectric Thin Film Resonator and Its Impact on Future Wireless Communication Systems

Satoh

Nishihara

Yokoyama

et al. 2005

Jpn. J. Appl. Phys.

130

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show abstract

“…The balanced-type SAW filter converts an unbalanced signal into balanced signals. The longitudinal coupled double mode SAW filter is suitable for a balanced configuration [1], [2].…”

Section: Introductionmentioning

confidence: 99%

P1K-2 Improvement of Balance Performance of SAW Filters by Common-Mode Signal Suppression

Nakamura

Tsuzuki

Ishizaki

2006

2006 IEEE Ultrasonics Symposium

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A new design concept for improvement of balance performance of SAW filters has been investigated. The balance performance is degraded by common-mode signals in the balance terminals. The concept employed is the suppression of the commonmode signals using a common-mode signal suppression circuit, connected to the balanced terminals. In the circuit, the impedance of balance terminals for the differential-mode signals becomes open to the ground level by the resonance circuit. And, the impedance of balance terminals for the common-mode signals becomes short to the ground level. And, the circuit has an impedance matching scheme. The improvement in balance performance was confirmed. This design concept could be applied to the circuit design for balanced-type SAW filter circuit designs.

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“…Today's highly miniaturized SAW filters offer superior filtering performance in combination with additional features, like impedance transformation, balun functionality or double balanced operation. [4] Fig. 1 shows the evolution of functional integration achievable with SAW filters within the near future.…”

Section: ][2][3]mentioning

confidence: 99%

Miniaturization and advanced functionalities of SAW devices

Meier¹,

Baier²,

Riha³

2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121)

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Apart from the active semiconductor chips a multitude of surface acoustic wave filters (SAW filters) are the key components that make modem RF circuits for mobile telecommunication and multimedia applications work. The latter are the most sophisticated and delicate species of passive components of which today's RF applications contain several hundred. While active integration has led to decreasing numbers of semiconductors inside a phone, at the time being the passive components outnumber the actives by far. Obviously, the highest potential for further miniaturization lies in the passive components. As the market asks for further miniaturized mobile phones and digital tuners EPCOS tackles this challenge not only by further shrinking the SAW filters but also by integrating additional functions into the SAW filters which were originally not SAW related at all. This paper briefly presents several applications for such highly miniaturized SAW filters offering superior filter performance combined with additional features like impedance transformation, balun functionality or double balanced operation, allowing for smaller and cheaper designs by effectively reducing PCB space as well as component count.

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High performance balanced type SAW filters in the range of 900 MHz and 1.9 GHz

Cited by 12 publications

References 3 publications

Development of Piezoelectric Thin Film Resonator and Its Impact on Future Wireless Communication Systems

Development of Piezoelectric Thin Film Resonator and Its Impact on Future Wireless Communication Systems

P1K-2 Improvement of Balance Performance of SAW Filters by Common-Mode Signal Suppression

Miniaturization and advanced functionalities of SAW devices

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