SU847488A1 - Device for communicating acoustic channels with arbitrary mutual orientation - Google Patents

Description

one

The invention relates to the field of radio electronics and is used in devices based on surface acoustic waves (SAS).

. Devices are known based on surfactant reradiation by combs of parallel conducting electrodes — multiband coupler (MPO) L1J.

With the help of the MPS, it is possible to communicate between channels with an arbitrary mutual orientation. Re-radiation is of a nonresonant nature, since the operating frequencies of such devices lie below the resonant frequency of the reflection of the MPO.

 The disadvantages of the MPS are the large number of electrodes (N) necessary for effective reradiation (for the LiNbO substrate) and the inability to electrically regulate the connection between the surfactant propagation channels.

It is also known a device for communicating acoustic channels with arbitrary

mutual orientation, containing the first interdigital transducer of surface acoustic waves of angular form, the first arm of which is oriented in the direction of the first channel, and the second arm in the direction of the second channel, and the second interdigital transducer located from the first arm of the first converter at a distance, equal

10 an odd number of quarters of the length of the surface acoustic wave 27.

The disadvantage of such a device is that the maximum fraction of the energy re-emitted from one channel;

ts to another is only 1-2%.

The aim of the invention is to increase the efficiency of the communication channels.

Claims (1)

To achieve the stated goal of the Sum of the World, the potential bus of the first on-line converter is loaded on inductance, and on the second on-pin converter - on complex resistance. the interdigital electrodes of the second transducer are made parallel to the interdigital electrodes of the first arm of the first transducer, and the aperture of the second transducer on the aperture of the first arm of the first transducer, while the aperture of the second arm of the first transducer is twice the aperture of the second transducer. FIG. 1 shows the proposed device for the communication of acoustic channels with an arbitrary relative orientation; Fig 2 - the same, in the process. When matching channels A and B, all acoustic power from A is completely reradiated to channel B. This mode is realized when compensating for the static capacitances of both transducers inductance and electrical matching in the terminal section CD, i.e. if the impedance of the system Nbi of the first arm of the first converter and the second converter in the cross section CD is equal to the input resistance of the second shoulder of the first converter. The input impedance of the second arm of the first converter depends not only on the configuration of this arm but also on the characteristics of the channel B. The channel B contains an effective reflector at a distance of 2 Win-M) from the second shoulder of the first converter. Then, to completely transfer the acoustic power from channel A to channel B., it is necessary that the apertures of the second arm of the transducer and reflector are equal to the apertures of the first arm of the first transducer and the second transducer (). In this case, unidirectional reradiation occurs. If there are no reflecting elements in channels В to „, then to match channels A and B, the aperture of the second arm of the first converter needs to be doubled (). Then the input resistance of the second cry of the first converter is equal to the complex resistance of the system in Lemma. the cross section of CD and the acoustic power falling entirely in channel A, reradiated, is evenly distributed between channels B and B ,. In this way, communication is provided between surfactant distribution channels with an arbitrary mutual orientation while maintaining the possibility of electrical control of this connection. Apparatus of the Invention A device for communication of arbitrary relative orientation acoustic channels, comprising a first corner transducer of surface acoustic waves of angular form, the first of which is oriented in the direction of the first channel, and the second shoulder in the direction of the second channel, and the second counter-transducer from the first arm of the first transducer at a distance equal to an odd number of quarters of the surface acoustic wave, characterized in that, for the purpose of Increasing the channel connection efficiency, summing up the piping bus of the first interdigital transducer is loaded on the inductance, and the second interdigital transducer on the impedance, the interdigital electrodes of the second transducer are made parallel to the interdigital electrodes of the first shoulder of the first transducer, and the aperture of the first transducer of the second transducer equal to the aperture of the first arm of the first transducer, while the aperture of the second shoulder of the first transducer is twice the aperture second converter. Sources of information I1 taken into account during the examination 1. Fransactione, МТТ-21.1973, 4, р. 206. 2, Patent of Great Britain No. 1386243, cl. H 3 And, publish. 1975.