Archive for October, 2015

Antenna Magus Version 5.5 Released

Wednesday, October 7th, 2015

We are pleased to announce the new release of Antenna Magus Version 5.5! In addition to some small feature extensions, this release includes new antenna designs and some exciting new transitions – which are extremely useful when designing feed structures and networks for antennas.

The new transitions are:

  1. Microstrip-to-waveguide transition
  2. Microstrip quadrature-hybrid coupler
  3. Microstrip ‘rat race’ coupler
  4. Broadband microstrip radial stub (band-stop structure)
  5. Coax-to-circular waveguide transition
  6. Coax-to-microstrip line transition
  7. Broadband coax-to-quad-ridged waveguide transition
  8. Coax-to-coplanar waveguide (CPW) transition

and the new antennas are:

  1. Quad-ridged conical horn antenna (QRFH)
  2. Pyramidal horn antenna with spherical Luneburg lens
  3. Pyramidal horn antenna with cylindrical Luneburg lens
  4. 2-by-2 array of sequentially rotated wire helix antennas
  5. Planar elliptical dipole antenna

For more information on this update, please visit the Antenna Magus Website or read the Version 5.5 Newsletter.

Cylindrical Luneberg lens

A 6-layer cylindrical Luneberg lens (cut-away to show layering) with pyramidal horn excitation and 3D radiation pattern.

Folded Dipole – bent and twisted…

Wednesday, October 7th, 2015

Antenna Magus simplifies the task of choosing a suitable antenna. Of course if you simply need a structure that will radiate at a certain frequency – without a specific pattern or impedance requirement – the task is a lot simpler!

I have seen a number of articles and papers where the possibility of using logos as antennas is considered – most notably Apple in the iPhone and Macbook following the 2010 “Antennagate”  scandal. Designing a ‘logo-antenna’ seems quite straight-forward:

1.  Figure out how big the structure should be
2.  Figure out how to excite the structure

… and then see if it radiates efficiently.

How do you go about doing this for a general logo though? If you can start from a well-known antenna that has a similar structure or shape to the logo then (even without extensive EM and antenna knowledge) the principles and guidelines of  the known radiating structure can probably be used as a good starting point to determine how to achieve some form of semi-efficient radiation for the logo.

btfd_3D

To illustrate, we have done a simple investigation using the official Magus logo. The “known” Folded dipole antenna can be morphed into a structure resembling the Antenna Magus logo… essentially a bent and twisted folded dipole. Starting from the Folded dipole designed at 1 GHz (courtesy of Antenna Magus) the “logo-antenna” above was designed.

btfd_s11

And how does this “logo-antenna” perform… quite well! At the 1 GHz centre frequency, the reflection and radiation performance is comparable to the original Folded dipole, with a 14% (-10 dB) reflection bandwidth and a gain of 2.3 dBi at the centre frequency. Nice!

And what about other well known logos?

Some are easy:

While some of the best known logos such as Nike, Coca-Cola and Ford are not that easy to match up… any ideas?