SU760856A1 - Acoustic unf delay line - Google Patents

Description

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The invention tends toward microwave technology, namely, acoustic microwave frequencies (hypersonic) delay lines, the principle of action of which is based on the mutual transformation of electromagnetic and elastic wave energy and using solid-state evukoprovodov as a retarding medium. The invention may find application in the control equipment of the microwave range, computer technology, communication systems.

Known acoustic microwave line, the delay "reflection", containing the sound duct, thin-film transducer and matching microwave device [Ϊ]. The sound line of the delay line is made of monocrystalline sapphire and is a cylinder with plane-parallel ends. At one end of the sound duct, a thin-film cadmium sulfide piezoelectric transducer is used, serving as both a radiator and a hypersound receiver. As matching of the microwave unit employed coaxial double stub eoglasovatel compensating capacitance pezopreobrazovaTe- _ή A and transforming it soprotiv2

the impedance of the transmission line impedance. This microwave line back-up favorably differs simplicity of design, simple process of manufacture and configuration of the main elements,. however, it provides a delay of the microwave signal for a short time with large insertion losses. In addition, the essential shortcomings of such a microwave-loudspeaker delay "reflection" are: the combination of input and output, complicating the switching circuit and the transmitting-receiving path, and the absence of electrodynamic isolation between the input and output; which does not provide suppression of the unused signal.

The acoustic microwave transmission delay is also known, which contains a solid-state acoustic duct, two thin-film transducers and two matching microwave devices (2). The sound duct of this delay line is also made of mycrystal Sapphire and is made in the form of a cylinder with flat-needle end-faces. On both ends of the acoustic duct are thin-film piezoelectric transducer of zinc oxide, one of which performs the function of the emitter, and the other - the receiver of hypersound.Sog760856

The matching microwave devices are made on segments of the strip transmission line and are adjacent to thin-film piezoelectric transducers. Such a delay line produces a delay in the microwave signal at a frequency for a longer time with small insertion losses and provides suppression of the unused signal at the output due to the electrodynamic decoupling of the input and output. In this design, the delay line input and output are spatially separated, which allows it to be included directly into the transceiver path, and the switching circuit does not contain additional devices. This circumstance significantly increases the reliability of radio equipment, in which an acoustic microwave delay line is used as a control device.

The disadvantage of this delay line is the need to use two thin-film piezo transducers and, accordingly, two matching microwave devices, which complicates the technology of their production and tuning. In addition, the design of the delay line “to pass” necessarily aligns the emitting and receiving transducers, as well as high accuracy (at least 1 °) of the orientation of solid-state sound conductors relative to the main crystallographic axes, which greatly complicates the process of their manufacture, as well as assembly and adjustment devices.

Closest to the invention to the technical essence and the achieved result is an acoustic microwave delay line "on reflection", containing a solid-state acoustic conductor, a segment of a rectangular waveguide and located in the same plane perpendicular to the axis of this segment, an inductive diaphragm, a pin and a thin-film piezotransducer with a metal sublayer, in which the transducer film is placed in the gap between the pin and the metal sublayer of the transducer connected to the wall of a rectangular waveguide [3 ].

This delay line provides at a frequency of 10 GHz the delay of pulsed microwave signals for a time

2.5 µs with a small insertion loss of 75 dB and good agreement with the microwave path. The design of this delay line contains only one piezoelectric transducer and, accordingly, one matching microwave device, which greatly simplifies the technology of their production and configuration. In addition, this design does not require high accuracy of orientation of the solid-state Zvukoprovod, as well as adjustment

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• radiating and receiving piezoelectric transducer.

However, in this delay line, the input and output are electrodynamically coupled and spatially combined, which does not provide suppression of the un-delayed microwave signal, and also does not allow switching on such a line directly into the transceiver path of radio equipment.

The aim of the invention is the provision of electrodynamic isolation and spatial separation of the input and output of the acoustic microwave delay line.

This goal is achieved by the fact that Υ-branching of a waveguide transmission line is introduced, in which a sound conductor made of ferrodielectric is rigidly fixed along the central axis / the Υ-branching is placed in a constant magnetic field oriented parallel to the axis of the sound duct, and one of the arms of this branching is connected with a segment of a rectangular waveguide.

The drawing shows an acoustic microwave delay line.

Acoustic microwave delay line contains a solid-state acoustic conductor 1 made of ferrodielectric, for example, an iron yttrium garnet, a rectangular waveguide segment 2 and located in the same plane perpendicular to the axis of this segment, inductive diaphragm 3. pin 4 and thin-film piezoelectric transducer 5 with a metal sublayer 6. The transducer film 5 is placed in the gap between the pin 4 and the metal sublayer 6 connected to the wall of a segment of a rectangular waveguide 2. The ferrodielectric acoustic circuit 1. is rigidly fixed lengthwise central axis Υ-branch 7, one arm of which is connected to the straight-line segment ^l coal waveguide 2. Υ-branching 7 taken at constant magnetic field H is oriented parallel to the axis .zvukoprovoda 1. Inside Υ-branching turbo 7 1 is surrounded by a cylindrical sleeve 8 of the dielectric material, providing coordination with the transmission line.

Acoustic microwave delay line works as follows. Pulsed electromagnetic microwave signal from the transmitter is fed to the input of the delay line and due to non-reciprocal properties of the magnetized ferrodielectric sound guide 1, placed in the-branching 7 and matched by the dielectric sleeve 8, is sent to the branch of the раз-branching 7, which is connected to the segment of the rectangular waveguide 2. In a thin film transducer 5 located in the gap between pin 4 and metal sub 760856

layer 6, connected to the wall of the segment of the waveguide 2, due to the inverse piezoelectric effect, the transformation of an electromagnetic wave into a hypersonic one occurs. The hypersonic wave propagates in the evukoprovod 1 in the direction of its reflecting end, is reflected from it and returns to the transducer 5, where due to the direct piezoelectric effect it transforms ’into an electromagnetic microwave signal delayed in time relative to the signal received at the input of the delay line. Then this delayed electromagnetic microwave signal over a segment of a rectangular waveguide 2 enters the раз-branching 7 th due to the non-reciprocal properties of the magnetized ferrodielectric sound guide 1 is sent to the output of the delay line and further along the waveguide path to the microwave receiver.

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Claims (1)

Claim Acoustic microwave delay line containing a solid-state acoustic duct, a segment of a rectangular wave, and even located in one plane 25 perpendicular to the axis of this segment, an inductive diaphragm, a pin and a thin-film piezoelectric transducer with a metal sublayer, in which the transducer film is placed in the gap between the pin and the metal sublayer of the transducer connected to the wall of the rectangular waveguide section, different in that in order to ensure electrodynamic isolation and spatial and the output, the Y-branching of the waveguide transmission line is introduced into it, in which the evukoprovod is rigidly fixed along the central axis; nny of ferrodielectric, and Υ-raevetvlenie placed in a static magnetic field oriented parallel to the axis of the acoustic line and the one arm of the junction is connected to a segment of a rectangular waveguide.