3
votes
I am having trouble with wide beam of my ultrasonic sensor
The sensor operates at 42KHz. With speed of sound ~330m/s this gives a wavelength of around 8mm.
The Rayleigh Criterion allows us to approximate the imaging resolution of a system based on the ...
- 4,052
2
votes
Accepted
About mobile user beamforming
The question is somewhat unclear so I am answering what I think it is.
Yes, the mobile user in whatever network service (be it an utility cell network, home wirreless network, etc...) is highly ...
- 8,726
2
votes
Accepted
Is an antenna array with a tilted (rotated) antenna element always less optimal than a perfectly aligned antenna array?
When discussing a linear array of elements, assuming the elements are identical (uniform linear array), the pattern can be written as:
$$G(\theta) = G_A(\theta)G_E(\theta)$$
where \$G\$ is the total ...
2
votes
Do beam-forming devices expect a particular antenna configuration?
There are two classes of beamformer. One type has the antenna configuration hard-coded into its mathematics, and attempts to construct geometrically beams towards wanted sources, and/or nulls towards ...
- 159k
2
votes
Accepted
What is the relation between beamforming design and user scheduling in massive MIMO systems?
Neither 'comes first', nor are beamforming and scheduling coupled to each other in the way I think you believe they are.
It also can depend a bit on the exact technology you have in mind. ...
- 28k
1
vote
Accepted
Nomenclature Issue - What is the origin of the term 'steering vector' in beamforming?
When you 'steer' an old style parabolic reflector radar antenna, by physically turning it, you provide it with a direction to look in.
If the 'steering vector' for a phased array actually steers ...
- 159k
1
vote
What is the relation between beamforming design and user scheduling in massive MIMO systems?
Beamforming is usually antenna term (or your physical layer) where multiple antennas transmit/receive in such way so there will be constructive interference at specific direction or multiple ...
- 864
1
vote
Hardware implementations for a low-cost ADC array project
I think the lowest cost you are going to achieve will be with some type of i2s-based adc. For example, Knowles has a "digital microphone" module with a microphone, amplifier, and i2s ADC all-in-one.
...
- 29k
1
vote
Accepted
Hardware implementations for a low-cost ADC array project
There is no such thing as a "lowish cost system" when you are talking about data acquisition of 300 to 500 audio-bandwidth signals. This is out of scope for an Arduino or even a Beaglebone. You ...
- 8,366
1
vote
Beam Steering range of a phased array antenna system
I am assuming, when you ask about beam steering range, you are asking if there are any limitations on the directions in which one can steer the main beam of the array.
First, we must have the number ...
1
vote
Accepted
Vertically oriented beams using antenna arrays
Yes, this can be done by adjusting the phase of the signal fed into each element of the array A, so that constructive interference is achieved in the direction you want to transmit, and destructive ...
- 127k
1
vote
How to tell the polarization (horizontal or vertical) of a microstrip linear array antenna just by inspection
The short answer is yes, the position of the feed of a single patch determines the horizontal vs. vertical polarization of that patch.
Since all the patches in the linear array are fed in the same ...
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