B737 Undifferentiated or Other Model
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 3.5
Communication Breakdown; Situational Awareness
ATC Issue All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance; Air Traffic Control Separated Traffic
Company Policy; Chart Or Publication; Airspace Structure; Procedure
Aircraft X and Aircraft Y both had to be kept high and vectored away from unknown VFR traffic (Aircraft Z; reported via ADS-B). I attempted to transmit in the blind to Aircraft Z; however; I received no response. The VFR traffic crossed the outer fixes of both the 28R/28L localizer at PDX at 2;700; unverified. The presence of this VFR traffic caused 2 aircraft to be kept high and vectored around during critical phase of flight while descending on approach to PDX.The Class Charlie airspace needs extensions to protect the final approach courses. The fact that VFR aircraft are legal to cross through localizers at conflicting altitudes without being in radio communication with ATC is dangerous. An extension [protecting] the localizer out to the outer marker; surface to 5;000; 3 miles lateral on either side would greatly improve safety.
P80 Controller reported vectoring off course and delaying descent clearance for two aircraft on approach due to an unidentified VFR aircraft conflicting in the vicinity of the Initial Approach Fix.