High frequency filter with phase compensating circuit

A high-frequency filter comprising:

• an antenna terminal;
• a transmission terminal;
• a reception terminal;
• a piezoelectric substrate;
• a transmission filter connected between the antenna terminal and the transmission terminal, the transmission filter including a plurality of series-arm acoustic wave resonators and a plurality of parallel-arm acoustic wave resonators arranged to form a ladder circuit and formed on the piezoelectric substrate;
• a reception filter connected between the antenna terminal and the reception terminal;
• and
• a phase circuit connected between at least two of the antenna terminal, the transmission terminal and the reception terminal, the phase circuit including a first capacitor, a second capacitor, and at least one interdigital transducer (IDT) electrode formed on the piezoelectric substrate and connected between the first and second capacitors.