Can the ILS locator also have false lobes, like the Glide Slope?
Yes.
The LOC (LLZ) uses the same 90MHz/150MHz signal modulation technique as the G/S signal.
A LOC carrier signal is a VHF signal in the 108-112MHz frequency range. That signal is modulated into a 90MHz signal for the left lobe, and 150Mhz modulation on the right lobe.
A G/S carrier signal is a UHF signal in the 329-335MHz frequency range. That signal is modulated into a 90MHz signal for the upper (high) lobe, and 150MHz for lower (low) lobe.
So, yes, its a similar technique of frequency modulation of the ground station signal. One tells you "left" or "right", the other tells you "high" or "low". Provided that you have navigated yourself to the right starting point, the zones of equal strength of 90/150 modulations have you "on track" and "on slope". Navigating to the a commencement point will be a fix or ground based locator, a lead bearing off an arc, or an ATC vector.
If you did not start at the right point, that is, outside the designed capture zone, you can track a "false" LOC lobe, and capture a "false" G/S.
You will get course reversals of the LOC bar > ±45 degrees of Localiser course.
False indications/capture is possible if LOC is used/armed > ±25 degrees of Localiser course.
Useful info here:
http://www.casa.gov.au/pilots/download/ILS.pdf
Use published lead bearings as a guide to when you expect 'true' LOC capture. Use point-to-point mental nav calc/DR to anticipate proper capture of LOC.
Eg: Worst case, turning 90 degrees onto a LOC at 10nm to run to threshold. If you are doing 300kt GS, rule of thumb = 1% of groundspeed = 3nm required for the right angle turn onto the inbound track. 240kt GS = 2.4nm for the 90 degree turn.
1/60 rule applied to 10nm to run = 1 degree of azimuth @ 10 = 6 degrees of azimuth for 1nm.
3nm required for turn = 3 x 6 = 18 degrees of azimuth (bearing change) for that 300kt GS right turn.
Or
2.4 x 6 = 14.4 = roughly 15 degrees.
Well within the 25 degrees rated coverage of the LOC lobes. And thats for a right angle turn. Hopefully your STAR or vector has a shallower intercept.
Published LOC inbound course = 090M
Intercepting from the south?
Commence your Rate 1 turn crossing the (270-18) = 252 radial/bearing from.
