Quarix 趁着实验课，把手上的小东西都测了一下。测试平台为AV3656A，设定测试频率为10MHz到3GHz，在进行SOLT校准后进行测量。 首先是泉盛UVK6的原装天线： 140MHz和458MHz为反射最小频率，同时在2.0GHz和2.7GHz处也各有一个谷。 接着是ADALM PlutoSDR的原装小天线： 淘宝上几块钱的 433MHz 天线： 淘宝上声称带宽2.5MHz的433MHz 双SAW BPF： 实际带宽10MHz往上了，插损也比较大。 最后是淘宝上就卖几毛钱的SMA黄铜直通，效果竟然还行： 3GHz处功率损耗也就0.989dB
BI1NIZ Based on my observations, the first antenna seems completely unusable. It doesn't have any proper resonance points, and I suspect the testing method is incorrect. This should be done using a test fixture to simulate handheld operation.
Quarix BG5VQE Thank you for the reminder. I was also curious about why the S-parameters of the mobile antenna changed significantly during testing. If possible, I would like to test it again with a similar enclosure to see if that makes a difference.
debain Thank you for sharing the test results; I learned a lot from it. Thank you for your hard work.
BG7MHZ The testing was hard work, but unfortunately, the method was incorrect. I've borrowed a picture from a HAM friend on the "借本坛" forum.
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