Harmonic phase tuning filter for RF switches

A switching module comprising:

• a first harmonic phase tuning filter coupled to a first input of an RF switch;
• said first harmonic phase tuning filter including an input section comprising a Pi-type LC filter and an output section, said output section coupled between said input section and said first input of said RF switch;
• said first harmonic phase tuning filter configured to provide an output impedance that substantially matches an input impedance of said RF switch at approximately a fundamental frequency and to provide a selected impedance at approximately a third harmonic frequency generated by said RF switch;
• wherein said Pi-type LC filter comprises:
• a first capacitor and a first inductor coupled in parallel between input and output terminals of said input section;
• a second capacitor coupled between said input terminal of said input section and ground;
• and
• a tuned circuit comprising a third capacitor coupled in series with a second inductor between said output terminal of said input section and said ground, said tuned circuit being tuned to provide substantially a phase short at approximately said third harmonic frequency generated by said RF switch;
• and
• wherein said output section comprises an LC circuit coupled between said output terminal of said input section and said first input of said RF switch, said LC circuit being tuned to provide said selected impedance so as to improve harmonic performance of said first RF switch, a value of said selected impedance not including a phase short or a phase open.