Methods and apparatus for performing efficient pattern matching in a client-server network are described herein. A beamforming system uses a distributed architecture and techniques for antenna beamforming using a feedback control loop to direct radio frequency energy onto a specific region, referred to as an interrogation zone, which includes a calibration node where one or more RFID tags may be located. The control unit is accommodated in the first housing. The disclosure also describes an apparatus and a battery which are designed to execute the method according to the disclosure. The method includes providing a first substrate; bonding a second substrate to the first substrate, the second substrate including a microelectromechanical system device; and bonding a third substrate to the first substrate.