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Questions tagged [antenna-array]

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E,H Planes beam widths derivation [closed]

I was refering to Antenna theory analysis and design fourth edition by Balanis for beamwidth formulas.I dont know how to solve beamwidth for planar arrays.Can any one help me to solve below equation ...
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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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46 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
36 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
43 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
52 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
46 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
22 views

Solution to coefficients for Spherical wave equations

Are there any methods for solving coefficients \$A\$ and \$B\$ for the Spherical wave equation below? \$p(r,\theta, \phi) = \sum\limits_{n=0}^{\infty} \sum\limits_{l=-n}^{n} \Big[A_{nl} h_{n}^{(1)}(...
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73 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
84 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
43 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
34 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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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
88 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
84 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
118 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
645 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
496 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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147 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 ...