Questions tagged [antenna-array]

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50 views

What is counterpoise?

I was reading about the radio telescope - Murchison Widefield Array (MWA) situated in western Australia. Antennas of this telescope are quite unique and different from usual dish radio telescope. In ...
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1answer
19 views

Why can the polarization of an antenna array be determined by the polarization of its individual elements?

In problems determining the polarization of an antenna array I've looked at, the polarization of the total array is determined by finding the polarization of a single element and then extrapolating ...
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30 views

Understand the simulation of patch antenna

I am working on IWR6843-ISK (http://www.ti.com/tool/IWR6843ISK). The board has 3 TX patch antennas and 4 RX patch antennas. I am trying to simulate the patch antenna in CST. TI has provided their ...
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1answer
50 views

RFID reader technology

Hopefully this isn't too broad of a question, I will narrow it down the best I can. We need to add RFID tags to feeders on our pick and place machine, to determine that they are loaded into the ...
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1answer
48 views

Satellite array antenna beamforming - basic intuition help

When you see a satellite coverage region on the earth, the array antennas form tens of circles (small coverages) in a large coverage. My question is whether all these small circle coverages exist at ...
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0answers
25 views

Using external directional antennas with 802.11ac MIMO / beamforming

I would like to add external directional antennas (Yagi or panel with ~30˚ horizontal/vertical beamwidth) to an 802.11ac router running DD-WRT. This is for an outdoor, field application where: ...
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2answers
185 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
42 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
60 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
22 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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1answer
48 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
60 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
58 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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50 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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91 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
123 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
53 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
36 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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29 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
128 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
145 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
147 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
732 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 ...
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1answer
752 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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164 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 ...