Patent ID: 6570467
Filing Date: 2003-05-27
Classification: H01P

Abstract:
An RF signal filter suitable for use in a mobile communication device, the filter comprising:an elongate block of dielectric material having a transmit electrode and an antenna electrode, and defining an array of spaced resonators extending from the a transmit electrode to the antenna electrode, the elongate block further defining a trap resonator positioned adjacent to the transmit electrode but opposite the array of spaced through hole resonators; a local ground conductive layer on the elongate block; and a switch circuit connected between the trap resonator and the local ground conductive layer for opening and closing a relatively low reactance link between the trap resonator and the local ground conductive layer, in which the relatively low reactance link includes a control electrode, a first PIN diode and a second PIN diode, the first PIN diode having a cathode connected to the trap resonator and an anode connected to the control electrode, the second PIN diode having a cathode connected to the local ground conductive layer and an anode connected to the control electrode.