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This paper describes working principles of traditional ladder-type surface acoustic wave (SAW) filter composed by resonators. The simulation model was founded by utilizing Quite Universal Circuit Simulator (QUCS) for a seven stepped SAW filters on substrate of relaxor based ferroelectric single crystals. An extremely large wideband SAW filter of 620 MHz at 1 GHz could be obtained due to large electromechanical...
This paper investigates the modeling and control problem of a novel piezoelectric-actuator (PZT) driven nanopositioner. The physical model of the nanopositioning stage is first discussed with the hysteresis nonlinearity of the PZT actuator. For the purposes of eliminating the hysteresis impact and various disturbances, an active disturbance rejection control (ADRC) algorithm is proposed, where the...
A novel planar monopole antenna for UHF communication, based on rectangular planar monopole, is proposed in this paper. By using some methods of the miniaturization technology and introduction of the couple element, the current distribution of the proposed antenna is improved, impedance bandwidth significantly is broadened and the size of the antenna is decreased. The size of the planar antenna is...
Patch antennas usually involve a ground plane much larger than the radiating element. To make a patch antenna compact, it is significant to reduce the size of the large ground plane. In this paper, a compact multi-folded patch antenna with a substantially small ground plane for UWB (ultra wideband) application at the UHF (ultrahigh frequency) band is presented. The proposed antenna is derived from...
A novel compact broadband V-shaped monopole antenna for UHF application is presented in this paper. The antenna evolves from the principles of bended L monopole and meander antenna. With the introduction of a shorting strip, the size of the antenna is just 48.7 mm × 40 mm × 60 mm (about 0.14λ × 0.12λ × 0.17λ, λ is the wavelength relative to the lower edge frequency 880MHz). It covers GSM-900 (Global...
A new compact box-shaped antenna based on suspended patch structure, suited for repeater antenna, is proposed in this paper. By employing two shorting plates, the overall antenna size is only about 0.27λ0 × 0.21λ0 × 0.035λ0 (λ0 is the wavelength corresponding to the lower edge 808MHz). With the aid of the fork-shaped feeding strip, bandwidth enhancement is achieved. A 28.8% simulated impedance bandwidth,...
Highly desirable types of networked multimedia applications should adapt to changes in the environmental conditions in which they operate, such as communication bandwidth, available memory, and battery lifetime, while providing the best possible quality of service (QoS). In this paper we present a software architecture that facilitates the development of adaptive networked multimedia applications...
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