Patent ID: 6559735
Filing Date: 2003-05-06
Classification: H01P

Abstract:
A monoblock duplexer filter adapted for connection to an antenna, a transmitter and a receiver for filtering an incoming signal from the antenna to the receiver and for filtering an outgoing signal from the transmitter to the antenna, the duplexer filter comprising a parallelepiped dielectric block having a top, a bottom and four sides, and including:an antenna electrode pad on the block; a transmit section extending between the antenna electrode and a first side of the block; a receive section extending between the antenna electrode and a second side of the block opposing the first side; each section having a plurality of through-hole resonators, each through-hole resonator extending between the top and the bottom; a transmit electrode pad on the block and spaced apart from the antenna electrode along the length of the block and positioned in the transmit section; a receive electrode pad on the block and spaced apart from the antenna electrode along the length of the block and positioned in the receiver section; an isolated resonator by-pass electrode plating on the top in the transmit section and extending from a position adjacent a first resonator of the plurality of through-hole resonators to a position adjacent a second resonator of the plurality of through-hole resonators, the first and second resonators being separated by at least one resonator therebetween; and a second isolated resonator by-pass electrode plating on the top in the receive section and extending from a position adjacent a third resonator of the plurality of through-hole resonators to a position adjacent a fourth resonator of the plurality of through-hole resonators in the receive section, the third and fourth resonators being separated by at least one resonator therebetween.