Active rf module

An active RF module comprising:

• an RF circuit section that is disposed on a board on which signal lines and a ground are formed and includes an RF signal processing circuit including at least one first voltage controlled variable impedance element;
• a filter that is formed to be separated from the board and includes a filtering circuit connected to the RF circuit section;
• an antenna that is formed to be separated from the filter and is connected to the signal lines of the board via the filter through an antenna feeder;
• a second voltage controlled variable impedance element that is applied as a filtering circuit element to the filter or is connected between the antenna and the ground;
• and
• a controller that generates a variable voltage according to an external control signal and applies the variable voltage to the first and second voltage controlled variable impedance elements.

An active RF module comprising:

• an RF circuit section that is disposed on a board on which signal lines are formed and includes an RF signal processing circuit including at least one element whose impedance is varied depending on a voltage;
• a filter circuit section that includes at least one voltage controlled variable impedance element connected to the RF circuit section;
• an antenna that includes a voltage controlled variable impedance element interposed between a portion of an antenna radiating structure connected to the filter and a ground;
• and
• an external connection electrode section that includes a plurality of electrodes electrically connected to the voltage controlled variable impedance elements for applying a voltage from the outside to the voltage controlled variable impedance elements.

An active RF module comprising:

• a ground substrate;
• a multiband antenna radiating structure that is disposed to be separated from the ground substrate;
• a short circuit section that connects the multiband antenna radiating structure to the ground substrate;
• a feeder that is connected to the multiband antenna radiating structure for signal exchange;
• at least one voltage controlled variable impedance element that is interposed between at least one of band regions of the multiband antenna radiating structure having highest current density in a predetermined multiband and the ground substrate;
• and
• a bandpass filter that is connected to the feeder and uses a voltage controlled variable impedance element as a portion of the bandpass filter.