Glenn and Andrew tested the v2b cylindrical patch antennas on the HP VNA in the PSU microwave lab. The v2b CPA's have 1/16" UHMW PE as a dielectric. We purchased "tape", which has acrylic adhesive on one side, and then proceeded to "spark gap" (oxidize with ozone) the other side and then used 2m super 77 acrylic adhesive spray to make the other side sticky.
Note that the huge jump from Er = ~1.4 of the foam to the Er = ~2.3 of the solid PE makes a huge difference in the feed structure - they should be way, way off. But all we cared about for these tests were the resonant frequency of the antenna, to make sure there wasn't something terribly wrong with our idea.
CONCLUSION: Our predicted resonant frequencies were shockingly close to our measured, especially given the off-frequency nature of the corporate feeds. we took this to be a good sign. The antennas were also pretty robust to flexing and what not, although that did change their frequency by 0.1 - 5 MHz. Hooray.
NEXT TIME DON'T FORGET: FLOPPY, BARREL, PATCH CORD
Predicted center frequency: 1.714 GHz FILE00 = 1.5 TO 2.0 CALIBRATION "Wifi" antenna: F = 1.6837 GHz, SWR = 1.02:1, BW = 1.6596 GHz - 1.7093 GHz = 49.7 MHz SCRN01 = resonant frequ. SCRN02 = smith We futzed with the antenna, and got f = 1.6839 GHz on it's side, no zip tie, opened up: f = 1.6879 GHz on it's side, no zip tie, hands in holding cylindrical: f = 1.6843 GHz Decided to try calling in a narrower range just to make sure the wide range wasn't affecting our results. FILE01 - 1.575 to 1.80 CALIBRATION SCRN03 = resonant freq. on it's side, no zip tie, hands inside holding cylindirical. on it's side, no zip tie, opened up: f = 1.6911 GHz on it's side, no zip tie, hands in holding cylindrical: f = 1.6864 GHz
SCRN01 = Wifi angtenna resonant frequency
SCRN02 = Wifi angtenna smith chart
SCRN03 = Wifi angtenna resonant freq. on it's side, no zip tie, hands inside holding cylindirical.
Predicted center frequency: 1.114 GHz FILE02 = 1.0 TO 1.2 CALIBRATION Antenna on side, slot down, hands holding cylindrically on the inside. SCRN04 = resonant frequ. SCRN05 = smith F = 1.1025 GHz, SWR = 1.02:1, BW = 1.0826 GHz - 1.1137 = 31.1 MHz
SCRN04 = GPS antennna resonant frequency
SCRN05 = GPS antennna smith chart
Time: 10:49am - swapped out disks, numbering scheme back to zero Predicted center frequency: 0.903 GHz FILE00A = 0.8 TO 1.0 CALIBRATION Antenna on side, slot down, hands holding cylindrically on the inside. SCRN00A = resonant frequ. SCRN01A = smith F = 0.90005 GHz, SWR = 1.15:1, BW = 0.8925 GHz - 0.9076 GHz = 15.1 MHz
SCRN00a = ATV antenna resonant frequency
SCRN01a = ATV antenna smith chart