1 00:00:01,700 --> 00:00:09,000 Hi! In this video I will show how to use BetaMatch to calculate an optimized matching network for a multiband antenna 2 00:00:09,803 --> 00:00:13,000 We will use an antenna called 'Dual Band' for this optimization. 3 00:00:13,200 --> 00:00:17,930 The Touchstone data for this antenna is part of the demodata that comes with BetaMatch - 4 00:00:17,980 --> 00:00:22,601 - and this is also the data that is loaded by default when BetaMatch first is started. 5 00:00:23,000 --> 00:00:26,500 You can also always load this data from the 'Help menu'. 6 00:00:27,300 --> 00:00:33,000 'Load Demo Data...' and select 'DualBand' and click OK. 7 00:00:34,177 --> 00:00:38,027 Before we do any calculations we must get our reference plane right. 8 00:00:38,187 --> 00:00:41,307 This is done in BetaMatch by setting the Electrical Delay. 9 00:00:42,000 --> 00:00:46,828 Click on the text 'Electrical Delay' and enter the correct value in the box. 10 00:00:47,208 --> 00:00:51,488 In this case it is 50ps. 11 00:00:51,728 --> 00:00:56,458 Now we must also tell the optimizer which frequency bands we wish to optimize for. 12 00:00:56,608 --> 00:01:02,000 In the 'Markers Menu' some of the more usual band configurations are predefined. 13 00:01:02,100 --> 00:01:10,300 Here we will select 'Pentaband' which gives us the 850, 900, 1800, 1900 and 2000 MHz bands. 14 00:01:10,700 --> 00:01:16,000 Notice that even if we have selected 5 bands we only have 2 distinct bands in our plots. 15 00:01:16,090 --> 00:01:23,000 This is because the bands that we have selected are overlapping and BetaMatch will automatically merge them. 16 00:01:24,100 --> 00:01:32,100 You can also see that the current frequency bands are shown in the status bar at the bottom of the window. 17 00:01:32,800 --> 00:01:37,000 We should also make sure that we are using the correct component series. 18 00:01:37,250 --> 00:01:43,300 This is done from the 'Components Menu', where we can select whatever component series we want. 19 00:01:43,400 --> 00:01:52,500 The default selection is Murata 0402-sized components. Those are fine so we will not change them now. 20 00:01:53,500 --> 00:01:59,300 Now we are ready to optimize. We can start the optimization either from the 'Toolbar' - 21 00:01:59,400 --> 00:02:04,500 - or from the 'Optimize Menu' by selecting the topology we want and just click. 22 00:02:04,700 --> 00:02:09,700 So, let us start by optimizing for a T-network. 23 00:02:10,700 --> 00:02:13,500 There, it is done. 24 00:02:14,000 --> 00:02:19,300 You can see the optimized network in the circuit diagram. Seen from the source it consists of a - 25 00:02:19,400 --> 00:02:29,500 - series 3.9nH inductor a shunt capacitor of 1.6pF a series 2.7pF capacitor and the antenna. 26 00:02:30,700 --> 00:02:35,750 We can compare the performance of this network with the design without any matching network. 27 00:02:36,500 --> 00:02:44,000 Click on 'Original' to bring up the data for the unmatched antenna, and we can look at the Return Loss 28 00:02:44,100 --> 00:02:51,400 The blue curve is the matched antenna and the black curve is the unmatched antenna. From the Return Loss we can see - 29 00:02:51,450 --> 00:02:57,000 - that the matching now is much better at the lower end of the low band and the upper end of the high bands. 30 00:02:58,000 --> 00:03:01,300 We can also look at the accepted power into the antenna, 31 00:03:01,310 --> 00:03:09,319 - we can for instance see that it has improved from about 18% to 55% at the high band. 32 00:03:11,400 --> 00:03:18,400 These results can also be viewed in tabular form in the 'Markers & Data window'. 33 00:03:20,300 --> 00:03:24,900 Let me rearrange a little bit and expand the window. We can now see - 34 00:03:25,000 --> 00:03:32,500 we have an increase from 18% to 55% accepted power at 2170MHz - 35 00:03:33,300 --> 00:03:40,500 - and we have improved from 25% to 54% at 824Mhz. 36 00:03:44,500 --> 00:03:49,500 Let us save this designed T-network into memory 1 37 00:03:51,900 --> 00:03:56,100 These are the best results we could get with a T-network, - 38 00:03:56,150 --> 00:04:00,600 - so now we wonder what would happen if we use more components, how much better would it be? 39 00:04:00,900 --> 00:04:05,900 Well, let's find out. Let's start a 5 component optimization.. 40 00:04:06,400 --> 00:04:15,200 It will take maybe 35 seconds on this computer. It's a laptop with 2 core CPU around 2GHz clock. 41 00:04:15,300 --> 00:04:20,500 not the latest model and not extremely fast. It is also slower because I am recording this. 42 00:04:20,800 --> 00:04:29,004 The T-network before was almost immediate and 4 component optimization is also typically less than a second. 43 00:04:29,500 --> 00:04:36,200 This 5 component optimization is considerably longer, but during this evaluation - 44 00:04:36,210 --> 00:04:43,500 - the software is actually evaluating 186 million networks and picking the best one. 45 00:04:44,000 --> 00:04:47,500 Now, it is done. 46 00:04:48,100 --> 00:04:54,500 Now we have the best 5 component matching network and let us compare it to the best T-network - 47 00:04:54,510 --> 00:04:57,600 - and also to the bare antenna without any matching network. 48 00:04:57,800 --> 00:05:05,000 I will change the view a little bit so we can see both networks at the same time. 49 00:05:08,600 --> 00:05:18,500 Turn ON memory 1. The red memory curve is the T-network and the blue curve is the 5 component matching network. 50 00:05:19,400 --> 00:05:27,100 We can see from the accepted power that we have improved from 54% to 77% - 51 00:05:27,350 --> 00:05:34,438 - and we have also improved from 55% to 66% efficiency at 2170MHz. 52 00:05:34,900 --> 00:05:42,200 This is quite an improvement and even more so if we compare with the antenna without any matching network - 53 00:05:42,283 --> 00:05:47,283 - which is black data in the plots. 54 00:05:49,058 --> 00:05:54,258 At 824MHz we have improved form 25% to 77%. 55 00:05:54,678 --> 00:06:02,300 At 2170MHz we have improved from 18% to 66%. Quite a significant improvement. 56 00:06:04,371 --> 00:06:11,000 This shows the basic optimization, but BetaMatch also has some more advanced features 57 00:06:11,800 --> 00:06:18,251 For instance it is possible to do Active Matching. The source can be changed to any complex impedance, 58 00:06:18,283 --> 00:06:23,283 - and also the source impedance can vary with frequency. 59 00:06:24,456 --> 00:06:27,070 Some other advanced features are: 60 00:06:27,100 --> 00:06:33,282 Weighting: Target different efficiency for different frequency bands. 61 00:06:34,103 --> 00:06:40,331 Pass- and reject bands: For instance to improve isolation between antennas. 62 00:06:40,474 --> 00:06:45,500 It is also possible to match for 2 or 3 antenna sets at the same time. 63 00:06:45,700 --> 00:06:51,500 For example if you have a flip- or slide-phone you can measure data in open and closed positions, - 64 00:06:51,520 --> 00:06:56,521 - load the data into BetaMatch and match for both sets simultaneously. 65 00:06:57,705 --> 00:07:05,700 That concludes this presentation. My name is Max Landaeus and the address to the web page and email is on the screen right now. 66 00:07:05,960 --> 00:07:13,400 Feel free to contact me if you have any questions or other feedback. Thank you for your time and your attention.