basic antenna phased array questions about phase bits
a 1 bit shifter has 2^1=2 phase states, 0, 180, and 2 beam positions?
a 2 bit shifter has 2^2=4 phase states 0, 90, 180, 270 and 4 beam positions? and
what are the beam positions? 0, 90, 180, 270: 270, 180, 90, 0:0,0,0,0 and 0, 180, 0, 180?
If 3 bits has a minimum phase bit of 45degrees, what if I do the phasing 0, 60, 180, 240, 300? How many bits is this? 2.5? and how many beam positions? 2^2.5 = 5.7?
Thanks!
what company makes the circuit? i haven't seen many digital phase shifters. post the link.
Phase shifter control the phase characteristics of a microwave signal.Phase is changed either by providing a longer path or by changing the characteristic of material... ..
Please see this site for more info
http://www.microwaves101.com/encyclo...seshifters.cfm
Phase shift offered by a multiple bit phase shifter will more often than not be a multiple of the minimum phase shift provided.
For example, in a 2-bit phase shifter where a single phase shifter provides a phase shift of 45 deg, multiple values will b 0 deg, 45 deg and 90 deg which corresponds to 3 beam positions in a single direction. In a 3-bit phase shifter with minimum bit of 45 deg, u'll have 0 deg, 45 deg, 90 deg and 135 deg.
What I'm trying to get at is that u won't be able to generate a 60 deg phase shift using digital phase shifters providing 45 deg of phase shift.
hope this helps.
Ananth.