Sampling filter and radio communication apparatus

A sampling filter comprising:

• a control signal generation section that generates a plurality of control signals having a same frequency and different phases;
• and
• 2m (where m is a natural number) integration units that integrate a received signal, wherein:
• the 2m integration units integrate the received signal at mutually different timings based on the plurality of control signals;
• and
• the 2m integration units are divided into two groups according to timing at which an integrated received signal is emitted, and emit the integrated received signal so that at least part of a period in which the received signal is integrated in m integration units composing one group selected from the two groups and a period in which a received signal integrated in a period before the period is emitted from m integration units composing another group other than the selected one group coincide temporally;
• some integration units among in integration units belonging to the two groups have:
• a first integrator that integrates a received signal;
• a second integrator connected in parallel to the first integrator;
• and
• a switch that is provided between the first integrator and the second integrator and switches a conduction state between both integrators, wherein:
• at least one of the two integrators has an MEMS (Micro Electro-Mechanical Systems) structure;
• and
• after a received signal has been integrated by the two integrators, the integrated received signal is transferred between the two integrators by turning the switch to an on state and changing a capacity value of an integrator having an MEMS structure of the two integrators, and furthermore a received signal remaining in the first integrator is emitted after the switch has been switched from an on state to an off state.