Differences

This shows you the differences between two versions of the page.

--- uwb:evb [2021/08/21 23:19] – [Omnidirectional UWB Antenna Design] neilhao
+++ uwb:evb [2023/02/11 17:30] (current) – external edit 127.0.0.1
@@ Line 41: / Line 41: @@
 === Symmetric Antenna Candidate 1  ===
 Symmetric Antenna Candidate 1 is a revised edition of Candidate 2. It also uses rectangular slot and attaching strip for size reduction [2]. This antenna is still printed on a 30mm*32mm PCB with desirable symmetrical radiation pattern. The bandwidth is expected to cover UWB Channels 2, 3,5 and 7.
+Sample 1 and Sample 2 are fabricated antennas with exactly same design. I used two samples for the consistency verification.
 {{ :uwb:uwb_symmetric_antenna_candidate1.png?direct&900 |}}
 {{ :uwb:uwb_symmetric_antenna_candidate1_s11.png?direct&600 |}}
-Note: Red – Sample 1, Pink – Sample 2, Blue – Simulated
+**Note:** __Red__ – Sample 1 Measured, __Pink__ – Sample 2 Measured, __Blue__ – Simulated
+The difference between the simulation results and measurement results is not only due to the accuracy of the simulation model. In the measurements of small antennas, the RF cable usually affects the performance of antenna under test greatly [2]. I reproduced this phenomenon by using different kind and different length SMA cables with the same VNA Tektronix TTR506A and VNA calibration kit. Notable difference of results was observed.
-**Radiation Pattern YZ Plane**
+**Radiation Pattern of YZ Plane**
 {{ :uwb:uwb_symmetric_antenna_radiation_pattern_3ghz_to_7ghz_candidate_1.png?direct&900 |}}