A wireless temperature sensor based chip comprises: an interdigital transducer, reflecting gratings, and a piezoelectric substrate. The interdigital transducer and the reflecting gratings are disposed on the piezoelectric substrate. The reflecting gratings are symmetrically disposed at two sides of the interdigital transducer. The interdigital transducer, the reflecting gratings, and the piezoelectric substrate are disposed in a housing of the sensor. Strips of the interdigital transducer vary from left to right in a grade-changing weighted manner, that is, overlapped lengths between adjacent strips vary from left to right according to a cosine function. The reflecting gratings use a metal aperture weighted manner, that is, the metal aperture is disposed between strips of the reflecting gratings. The temperature sensor based chip requires no power supply and transmission lines, can implement temperature measurement with high precision in a harsh environment.

A wireless temperature sensor based chip comprises: an interdigital transducer, reflecting gratings, and a piezoelectric substrate. The interdigital transducer and the reflecting gratings are disposed on the piezoelectric substrate. The reflecting gratings are symmetrically disposed at two sides of the interdigital transducer. The interdigital transducer, the reflecting gratings, and the piezoelectric substrate are disposed in a housing of the sensor. Strips of the interdigital transducer vary from left to right in a grade-changing weighted manner, that is, overlapped lengths between adjacent strips vary from left to right according to a cosine function. The reflecting gratings use a metal aperture weighted manner, that is, the metal aperture is disposed between strips of the reflecting gratings. The temperature sensor based chip requires no power supply and transmission lines, can implement temperature measurement with high precision in a harsh environment.

A surface acoustic wave resonator device comprises a substrate supporting: a gateable, electrically conducting layer; an interdigital transducer (IDT); a reflector grating that comprises a plurality of electrically separated fingers; a main ohmic contact; and a gate element. The IDT is configured to be connectable to a ground. The conducting layer is configured to be connectable to the ground via the main ohmic contact, while each of said fingers is electrically connected to a lateral side of the conducting layer. This defines a gateable channel, which extends from the fingers to the ground via the conducting layer and the main ohmic contact. The gate element is electrically insulated from the conducting layer. The gate element is configured to allow an electrical impedance of the gateable channel to be continuously tuned by applying a voltage bias to this gate element with respect to the ground, in operation of the device.

An input port, an output port, and a plurality of serial resonators and a plurality of parallel resonators connected in a ladder type between the input port and the output port and including IDT electrodes are provided. The plurality of parallel resonators include at least one first parallel resonator having a resonance frequency lower than resonance frequencies of the plurality of serial resonators, and at least one second parallel resonator having a resonance frequency higher than antiresonance frequencies of the plurality of serial resonators.

Interdigital transducer (IDT) and reflective structure arrangements for surface acoustic wave (SAW) devices are disclosed. Representative SAW devices are described herein with reduced overall size while maintaining good quality factors. In certain embodiments, a SAW device may include an IDT arranged between reflective structures on a piezoelectric material. The reflective structures may include reflective IDTs that are configured to have a phase difference with the IDT to reflect and confine acoustic waves in the piezoelectric material. In certain embodiments, the reflective structures may be electrically connected to at least one of an input signal or an output signal. In this manner, the reflective structures may be configured with reduced size as compared to conventional reflective structures such as gratings, thereby providing a SAW device with reduced dimensions without a negative impact on device performance.

A surface acoustic wave resonator that has at least a first resonant frequency and a second resonant frequency is disclosed. The surface acoustic wave resonator can include an interdigital transducer electrode that is positioned over a piezoelectric layer. The interdigital transducer electrode includes fingers having a first pitch. The surface acoustic wave resonator can also include a first set of reflectors that is positioned over the piezoelectric layer. The first set of reflectors includes a first number of reflectors having a second pitch. The first pitch is greater than the second pitch. The surface acoustic wave resonator can also include a second set of reflectors that is positioned over the piezoelectric layer. The second set of reflectors includes a second number of reflectors having a third pitch. The second number of reflectors is different from the first number of reflectors.

The present application relates to a biosensor that employs an acoustic cavity to store mechanical energy. In particular examples, the biosensor includes an electrode region and one or more reflector regions to form the acoustic cavity, as well as a functionalized active area disposed in proximity to the cavity. Methods of making and using such biosensors are also described herein.

An acoustic wave device comprises a piezoelectric substrate, interdigital transducer electrodes having an electrode pitch .sub.0, and first and second reflector gratings disposed on opposite respective sides of the interdigital transducer electrodes in a propagation direction of a main acoustic wave through the acoustic wave device, the first reflector grating having a reflector electrode pitch .sub.1 throughout an entirety of the first reflector grating that is different than a reflector electrode pitch .sub.2 throughout an entirety of the second reflector grating to suppress ripples in a conductance curve of the acoustic wave device.

An apparatus for filtering is disclosed that implements a double-mode surface-acoustic-wave filter having a transition region with a partly uniform geometric property. In an example aspect, the double-mode surface-acoustic-wave filter includes at least one interdigital transducer with multiple fingers. The multiple fingers include a first set of fingers having a geometric property and a second set of fingers. The second set of fingers is positioned adjacent to the first set of fingers and is associated with an outer edge of the at least one interdigital transducer. The geometric property across a subset of the second set of fingers is substantially uniform. A value of the geometric property across the subset of the second set of fingers is different than a value of the geometric property across the first set of fingers.

An integrated circuit (IC) resonator module for an IC package includes an acoustic resonator having a surface and a Bragg reflector adhered to the surface of the acoustic resonator. The Bragg reflector includes low impedance layers formed of a first material with a first acoustic impedance and a high impedance layer formed of a second material with a second acoustic impedance. The second acoustic impedance is greater than the first acoustic impedance. The Bragg reflector further includes a Bragg grating layer formed of randomly or periodically spaced patches of the second material separated by vias filled with the first material.