Syed Hussain Ali Bokhari

7 Questions 9 Answers 0 Followers

Questions related from Syed Hussain Ali Bokhari

Usually horn antennas are used for the measurement of metamaterials or Frequency selective surfaces. Can one use some kind of patch antenna instead?

The aperture of horn antennas is usually large. This creates problems of requiring more distance and room for far field measurements. Is there a way, we can use patch antennas or other...

13 June 2020 7,170 7 View

How to calculate radius of a spherical wavefront of antenna at a particular distance?

For directive antennas, a wave front will propagate as spherical form at shorter distances, and as the propagation distance increases, its wavefront radius will get bigger. so at any particular...

04 June 2020 4,997 1 View

When measuring transmission parameters for metasurface, what should be the distance between the two horn antennas to have a far field illumination.?

In a generic setup, where metasurface is placed between the two antennas, what should be the minimum distance between the two antennas for accurate measurements: preferably in far field.?

04 June 2020 2,029 3 View

How to callibrate the VNA when measuring S parameters of a metasurface?

I want to measure the reflection and transmission parameters of a metasurface. I have placed the metasurface in between the two horn antennas that are connected to the 2 ports of VNA. How will I...

25 February 2020 3,893 5 View

What is the key feature in metasurfaces that makes them angularly stable?

I have seen unit cell designs that only perform at normal incidence while there are some designs that perform for a wide range of incidence angles. what is the reason or explanation behind this....

19 January 2020 6,694 2 View

What is the criteria for claiming whether a metasurface is ultra thin?

I have designed a metasurface which has a thickness of 0.78mm. Its operating frequency is around 15 GHz. Can I call it ultra thin?. In terms of lamda, the thickness of metasurface is lamda/23

11 January 2020 8,772 6 View

SIW power divider after fabrication not giving desired results.(explained in description). What can be the reason?

A friend of mine is currently working on designing a SIW based power divider. The frequency range is 27-29 GHz. The simulations show the required response in the above mentioned band but I am...

27 March 2019 4,517 2 View