Patent ID: 7420440
Filing Date: 2008-09-02
Classification: B05D,C23C,H03H

Abstract:
1. A transmitting filter comprising: a first SAW resonator coupled to a first node, the first SAW resonator having a first high frequency equivalent resistance value; a second SAW resonator coupled to the first node and a second node, the second SAW resonator having a second high frequency equivalent resistance value which is higher than the first high frequency equivalent resistance value; a third SAW resonator coupled to the second node, the third SAW resonator having the first high frequency equivalent resistance value; a fourth SAW resonator coupled to the first node and a third node, wherein a high frequency equivalent resistance value of the fourth SAW resonator is lower than 15 ohms; a fifth SAW resonator coupled to the second node and the third node, wherein a high frequency equivalent resistance value of the fifth SAW resonator is lower than 15 ohms; and an inductor coupled to the third node and a ground node.