# Recent content by cross

1. ### antenna pattern calculation at the presence of objects

Dear All, I'm interested in any useful sources/books-papers/code regarding the calculation of antenna patterns at the pressence of nearby obstacles (walls, metallic towers/objects etc). I'm interested in first principles on how to approach the topic. Any help or pointing to the right direction...
2. ### 3D antenna pattern interpolation

Dear all, I was wondering if anyone knows how to combine (interpolate) 2 antenna pattern cuts (Vertical and horizontal) to a 3D pattern. Any directions to some matlab, c or other code, or relevant links will be much appreciated. Best regards Cross
3. ### 3D plotting/generation of antenna pattern

Hi to all, Can anyone provide some input how one can plot/generate in matlab and/or C# (or C++) a 3D antenna pattern from the E and H plane patterns? Any input will be highly appreciated. Many Thanks, Cross
4. ### field calculation away from an antenna

antenna far field calculation program Hi, I was wondering which simulator people would recommend in the following scenario. Imagine that the problem is the estimation of the near and far field several tenths of meters away from an antenna (near and far field) by considering also the...
5. ### developments in satellite receive antennas

Hi, Does anybody have any information on developments in satellite receive antennas. Any information on flat plated or alternatives to dishes? Any information/links/documents will be greatly appreciated Kind Regards Cross
6. ### calculation of field in the near field region of an antenna

Re: calculation of field in the near field region of an ante Thank you all for the info. Do you know if you can define a parabolic antenna in IE3D? Kind Regards Cross
7. ### calculation of field in the near field region of an antenna

near field calculation Hi, Anybody nows the easiest way (or software) where you can import an antenna pattern or structure and check how much is the received field in the near field region or how this field diminishes in the near-field region with an increasing distance from the antenna? The...
8. ### RF splitter, combiner and duplexer. How does it work?

how rf splitters work For splitters and combiners have a look in the apps section of Minicircuits. For duplexers: hxxp://www.seits.org/duplexer/duplexer.htm

10. ### Question: how to reduce NF in a Receiver?

Except everything else that have been mentioned, make sure you don't have a lossy cable connecting your antenna to the first stage (filter or LNA). A look at the Friis Formula will show you what you need to do and why. Cross
11. ### How to Model Concrete Wall for UWB Radar?

This is tricky. You need to take into consideration that the constitutive parameters will change in the 2-10GHz range. Also If the concrete is reinforced this will introduce frequency selective effects. Kind Regards Cross
12. ### size of patchantenna and maximum gain question

Does anybody now what is the maximum gain that can be achieved through a patch antenna design having the minimum possible dimensions? I have seen patch antennas having a gain of 19 dBi (or even 23dBi) at dimensions of 0.37X0.37m (19dBi). Have you seen or do you know if we can achieve an antenna...
13. ### please recommend 700MHz 1W power amplifier

Minicircuits HELA works up to 1GHz and delivers 1W Rgds Cross
14. ### How i can design a LNA with PCS1900 band?

Have a look at the application notes at Philips semiconductor site. Rgds Cross
15. ### Mini circuits Mixer Biasing

sra-1 mixer Hello, Did you have a look in their web page (Minicircuits) or the data sheets. If you are talking about a Minicircuit active mixer the power is required for the internal amplifier module so current consumption will depend on the model. Passive mixers don't require any biasing. Cross