发明名称 |
APPARATUS FOR SUPPRESSION OF SPURIOUS ATTENUATION POLES IN CRYSTAL FILTERS |
摘要 |
Piezoelectric filter includes a piezoelectric substrate having an upper and lower opposed major surfaces. A plurality of N coupled resonators where N is an integer greater than two exposed on the surface of the substrate. A plurality of mounting pedestals are utilized to couple the resonators to ground in a manner such that no two non-adjacent resonators are coupled to any one pedestal. This mounting scheme suppresses undesired spurious attenuation poles and improves the selectivity of the piezoelectric filter. |
申请公布号 |
AU585482(B2) |
申请公布日期 |
1989.06.22 |
申请号 |
AU19840028275 |
申请日期 |
1984.04.12 |
申请人 |
MOTOROLA INC. |
发明人 |
ROBERT J. HIGGINS JR. |
分类号 |
H03H9/05;H03H;H03H9/56;H03H9/58 |
主分类号 |
H03H9/05 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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