SURFACE ACOUSTIC WAVE FILTER AND ANTENNA DUPLEXER USING THE SAME

• Main Authors: MURAKAMI, KOZO, SAKURAGAWA, TORU, SATOH, YUKI, TAKAYAMA, RYOICHI
• Format: Patent
• Language: English; French; Japanese
• Published: 06.03.2003
• Edition: 7
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS

A surface acoustic (SAW) wave filter comprises SAW resonators having impedances Za1 to Za5 and a parasitic inductance of an impedance Za6 between the filter and the ground. As an attenuation pole, a frequency at which Im (Zap) =0 is provided between the passband and cutoff band by determining Zap=(Z...