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# <a name="Constructing LV2&#39;s Cylindrical P"></a> Constructing LV2's Cylindrical Patch Antennas

**_NOTE: THIS PAGE IS BEING HACKED TO BITS. FOR MORE CURRENT INFORMATION, PLEASE SEE THE [[CommunicationsTeamHome]] PAGE._**

## <a name="Construction Process #1: Duroid"></a><a name="Construction Process #1: Duroid "></a> Construction Process #1: Duroid PCB

We're using [Roger's Corp](http://www.rogers-corp.com/mwu/translations/prod.htm) RT-Duroid 5880 0.031" thick 1oz electroplated PCB material (an 18" x 16.5" piece, nonetheless) for the antenna. A big thanks to Rogers for donating two sheets of it! Hooray, we're going to have an antenna.

- See the attached docs below for more information on the material.
- For more technical articles on the 5880, see <http://www.rogers-corp.com/mwu/litintbl.htm> (including articles on strain releif, rolling/bending, etc).

**Methods:**

- We're creating a PCB layout.
- We're exporting Gerber files and having them made into artwork.
- We're etching the Duroid PCB.
- We're pre-rolling the etched boards so we don't break things when we bend it around the airframe.
- We're mounting the antenna onto part of the rocket's fiberglass skin.

## <a name="Construction Process #2: Roll yo"></a> Construction Process #2: Roll your own air

These people - <http://www.eccosorb.com/eccostock> - make a foam in place polyurethane that is 2lb density and has a Er = 1.1. But it's (FPH: 1.3 lb - $62.42, Cat: 0.9 lb - $56.72) and all together is $155 to ship since it's a class B poison (joy).

Here's some more notes on polyurethane foam: From [http://www.atnf.csiro.au/projects/ska/techdocs/Lens\_Weight.pdf](http://www.atnf.csiro.au/projects/ska/techdocs/Lens_Weight.pdf):

- Polyurethane 160kg/m^3 Er = 4.0
- Polystyrene 1050kg/m^3 Er = 2.5
- "low density" foam = 40 kg/m^3

Interesting: variable dielectrics: <http://wwwnew.towson.edu/mesrp/TheResearch2000.htm>

What is the dielectric constant of "plumber's foam", a 2lb density polyurethane foam?

- Here's some tests we did on [Tap Plastic's](http://www.tapplastics.com) X-30 expanding polyurethane (EPU) foam on [[Thursday July 31st 2003|FoamTest31July2003]].
- Here's a mock up test of the CPA using 0.005" PCB and 0.01" Copper: [[Friday August 16th 2003|FoamTest16Aug2003]].

## <a name="Construction Process #3: Use oth"></a> Construction Process #3: Use other people's rolled air.

We've finally found something that seems to work: [[double sticky Polyethylene foam tape|PeFoamTapeEr]].