Low-loss NSPUDT SAW filters with inclined reflective arrays

Author

Doberstien, S.A. ; Shvetsov, Alexander ; Zhgoon, Sergei

Author_Institution

ONIIP, Omsk, Russia

Volume

2

fYear

2003

fDate

5-8 Oct. 2003

Firstpage

2077

Abstract

This paper presents the low-loss natural single phase unidirectional transducer (NSPUDT) SAW filters, which use SAW propagation direction reversal without the reversal of NSPUDT directivity. In this design the input and output NSPUDTs are placed in parallel acoustic tracks. SAW transmission between these tracks and propagation direction reversal are provided by a double reflection from a pair of inclined reflective arrays. An asymmetric quartz crystal orientation was chosen where conventional IDTs with the λ/4 electrodes have SAW unidirectional radiation. The 56 MHz and 172 MHz experimental filters with the LC-matching showed an insertion loss of 8-10 dB and low ripple within the passband.

Keywords

acoustic transducers; interdigital transducers; surface acoustic wave filters; 172 MHz; 56 MHz; 8 to 10 dB; SAW propagation direction reversal; SAW transmission; SAW unidirectional radiation; asymmetric quartz crystal orientation; low-loss NSPUDT SAW filters; natural single phase unidirectional transducer; parallel acoustic tracks; reflective arrays; Aluminum; Electrodes; Frequency measurement; Frequency response; Insertion loss; Intrusion detection; Passband; Reflection; SAW filters; Surface acoustic waves;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics, 2003 IEEE Symposium on

Print_ISBN

0-7803-7922-5

Type

conf

DOI

10.1109/ULTSYM.2003.1293328

Filename

1293328