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Questions tagged [antenna-array]

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71 views

Distance requirements in antenna arrays?

Antenna array is a broad term and it encompasses at least the following concepts: MIMO or massive MIMO: for spatial multiplexing beamforming: increasing the SNR (at transmitter or receiver) by ...
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1answer
41 views

Zeros in radiation of Smart Antennas

I have an exercise from a textbook about smart antennas. I think I have the right approach to solve this kind of problem. However, I'm not quite sure if I'm handling it correctly due to the additional ...
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0answers
57 views

How to design a 3GHz antenna? [closed]

I would like to design a 3GHz high gain antenna. S11 has to be below -10dB and the gain to be above 9dBi - and I want to make it smaller than 8cm. What kind of antenna is better to satisfy the ...
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0answers
19 views

Taking of E,H plane patterns

In many textbooks i have read E-plane is taken at a given azimuth where maximum radiation is observed and H-plane is taken at a plane perpendicular to the Eplane.Does it mean H-plane should be taken ...
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0answers
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What do we mean by spatial smoothing in 1D antenna Array?How does spatial smoothing helps us in estimating direction of Arrival of signals?

I want to know the motivation behind spatial smoothing in Antenna Arrays.Can anyone help in explaining spatial smoothing in Antenna Arrays.
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0answers
60 views

Cycle time / transmission cycle in short range automotive radar

I am somewhat newbie in the radar field. I am reading SRR20X-datasheet from Continental. I have two question. What are definitions of Cycle time/transmission cycle (second page)? And in the document,...
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1answer
45 views

Phased array receiver circular polarization

In a phased array system, what will have to change in a receiver's architecture if it needs to work for both linear and circular polarization? I saw in one article it is said "Supports automatic ...
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1answer
51 views

Patch antennas: explanation of examples

I am studying patch antennas for mobile communication (technology.) I have found some examples of them but without explanation. Maybe can someone explain to me the difference of examples from this ...
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0answers
57 views

Cellular towers in rectangular grid

Not that far from where I live there are 6 towers that appear to be for cellular purposes in a perfect grid. You can see them in the picture I took from google maps. In the center of the road are ...
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0answers
47 views

Active phased antenna array for Wi-Fi efficiency compared to a directional antenna?

I'm interested in mesh networking of poorly controllable autonomous aerial vehicles (like blimps), so i wonder whether it is viable to use a phased antenna array versus a few traditional directional ...
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0answers
84 views

Cst phased array feeding

How can I feed my microstrip patch antenna with phase difference? I managed to get more directed beam but now I want to scan an area by changing directivity.
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1answer
99 views

How are antenna arrays synchronized for direction finding/localisation?

How are antenna arrays synchronized for direction finding/localisation? For example, if the processing unit is located closer to one antenna then another, it will see the signal from the closer ...
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1answer
46 views

Vertically oriented beams using antenna arrays

Referring to the above picture, can an antenna array mounted on Node A direct beams towards Node B and Node E, without the need for an antenna rotator (or manually orienting the antenna array towards ...
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1answer
35 views

Transmitting from omni to directional antenna

If an omni-directional antenna (transmitting antenna) transmits to a directional antenna (receiving antenna), how will the SNR be affected compared to when both antennas are omni?
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0answers
26 views

Aperiodic lattices and beamwidth of reflectarray antenna

This question is about reflectarray antennas. In the paper below, it is mentioned that: "A second useful rpoperty of aperiodic arrays is the possibility to reduce the number of elements in one ...
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1answer
103 views

Why does electrical phase vary with element length?

In a reflectarray antenna, each element on the antenna aperture requires a different electrical phase due to different distances from the antenna feed. One way to achieve this phase variation is to ...
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1answer
103 views

Total Cable/Splitter loss calculation for Gain value compensation

If there is an 8 port splitter attached to cables feeding an array, is the total Cable/Splitter loss = S21 measurement for each port (with terminations on others) OR I have to add the S21 value of ...
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2answers
130 views

Can i join ground and signal wire in antenna?

Is there need to connect ground and signal wire differently in yagi antenna. I took outer shield(ground) and inner part(signal) of coax cable ( coming from antenna) and twisted them together and then ...
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1answer
675 views

What is the purpose of the elements of this antenna?

I have a 5GHz 23dBi Wi-Fi panel antenna which has the geometry shown in the images below. I have been quite curious as to the purpose of this bizarre antenna design. The elements have such unique ...
1
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1answer
607 views

How to tell the polarization (horizontal or vertical) of a microstrip linear array antenna just by inspection

I know that a linear array of microstrip patches can be either horizontal or vertical depending on its orientation. Does the feed (input port of the array) determine the direction of polarization?
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0answers
154 views

bearing ambiguity resolve (direction finding) for multiple sources

I am working on wideband direction finding algorithms for passive sensors. I started with Music algorithm. For practical reasons, the spacing can not be maintained lambda/2. For greater antenna ...