1 00:00:02,000 --> 00:00:07,890 Hi, I'm Max Landaeus and in this video I will show how to use BetaMatch to find optimized matching networks - 2 00:00:07,900 --> 00:00:19,800 -to match the same antenna to three different source impedances: 50 Ohm, 20 - j20 Ohm and 300 + j300 Ohm. 3 00:00:21,000 --> 00:00:28,300 For this demonstration we will use a single band Bluetooth antenna and the Touchstone data comes with BetaMatch. 4 00:00:28,350 --> 00:00:36,000 The data can be loaded via the 'Help Menu' choose 'Load demo data' and select 'BT tuned high' and click OK. 5 00:00:36,400 --> 00:00:47,514 Furthermore we will leave the electrical delay at 0ps and we will use the default 0402-sized Murata components. 6 00:00:48,267 --> 00:00:53,200 Notice that the components are based on real measured component data with losses and everything included. 7 00:00:53,747 --> 00:00:58,021 We also need to set the frequency band to the 2.5GHz band. 8 00:00:58,281 --> 00:01:04,200 Go to 'Markers Menu' and select 'Bluetooth' and the band is set. 9 00:01:04,305 --> 00:01:07,381 We can see that this antenna is tuned high. 10 00:01:07,473 --> 00:01:18,500 We can see from the table here that we only have 35% accepted power into the antenna at 2.4GHz. 11 00:01:18,836 --> 00:01:25,000 We are now ready to start our first optimization with the default source impedance of 50 Ohm. 12 00:01:25,500 --> 00:01:31,031 We start an optimization for 4 components now ... 13 00:01:31,719 --> 00:01:35,719 ... and now it's done. It turned out to be only 3 components needed. 14 00:01:36,206 --> 00:01:43,750 As you can see, the accepted power at 2.4GHz has now improved from 35% to 73%. 15 00:01:44,500 --> 00:01:51,100 We save this design into Memory 1 for future reference. 16 00:01:51,600 --> 00:01:57,200 We are now going to change the source impedance to 15 - j20 Ohm. 17 00:01:57,700 --> 00:02:02,400 I do this from the source editor. I open it and enter the new values. 18 00:02:02,450 --> 00:02:10,170 First I enter the real part: 15, and then the complex part as +20 because I am actually entering the BEST load, 19 00:02:10,200 --> 00:02:15,200 our TARGET which is the conjugate of the actual source impedance. 20 00:02:15,900 --> 00:02:20,200 I tick two boxes so we can see the source impedance and the conjugate in the Smith Chart. 21 00:02:20,860 --> 00:02:25,860 As you can see now, the source impedance has changed to 15 - j20 Ohm. 22 00:02:26,836 --> 00:02:32,800 We are now going to optimize for this new source impedance. We start the optimization... 23 00:02:33,498 --> 00:02:41,500 There it is done! We have a 4 component matching network and the accepted power is now 71% at the band edges. 24 00:02:42,400 --> 00:02:48,500 Also note that the S11 plot and the Smith Chart always use a 50 Ohm reference. 25 00:02:48,922 --> 00:02:55,400 So this is what you design would look like when measured with a network analyzer in a 50 Ohm system. 26 00:02:56,002 --> 00:03:01,100 The Accepted Power plot, on the other hand, shows the accepted power for the actual source impedance. 27 00:03:01,252 --> 00:03:06,300 If we want to see what it would have been like with a 50 Ohm source we can enable that. 28 00:03:06,372 --> 00:03:10,672 And that would have looked like the dotted line in the Accepted Power plot. 29 00:03:12,011 --> 00:03:16,000 Let us store this design in Memory 2. 30 00:03:16,235 --> 00:03:23,424 Now we will change the source impedance again. This time we will change it to 300 + j300 Ohm. 31 00:03:23,827 --> 00:03:29,026 Open the source editor and change the values to 300 and - 32 00:03:29,026 --> 00:03:34,888 - the imaginary part would be -300 since we enter the TARGET, the conjugate. 33 00:03:38,659 --> 00:03:45,500 As you can see, the old matching network does not work at all so we will start a new optimization. 34 00:03:47,508 --> 00:03:57,111 There, it is done. We can see that we have 72% and 73% accepted power at the band edges. 35 00:03:57,463 --> 00:04:04,159 We have now designed different 3 matching networks for 3 different source impedances so let us compare them. 36 00:04:04,451 --> 00:04:08,071 In Memory 1 we have the 50 Ohm design. 37 00:04:08,423 --> 00:04:14,808 And we have the low impedance, the 15 - j20 Ohm, design in Memory 2. 38 00:04:15,211 --> 00:04:20,138 We can se that the accepted power is similar for all designs but they are totally different in the Smith Chart. 39 00:04:20,440 --> 00:04:25,266 Let me rearrange the windows so we can compare the results. 40 00:04:30,646 --> 00:04:35,171 We will show all matching networks at the same time. 41 00:04:35,221 --> 00:04:40,450 So we have 'Data' with the 300 Ohm design 42 00:04:40,500 --> 00:04:43,329 We have 'Memory 1' with the 50 Ohm design 43 00:04:43,574 --> 00:04:46,835 We have 'Memory 2' with the 15 Ohm design. 44 00:04:46,999 --> 00:04:54,999 We can see in the table here that the accepted power is around 71 - 73% for all the designs. 45 00:04:56,992 --> 00:05:06,092 That concludes this demonstration. My name is Max Landaeus and web-site and e-mail address is on the screen now. 46 00:05:06,192 --> 00:05:13,100 Please feel free to contact me if you have any questions or any other feedback. Thanks for your attention.