Experiment 2: To tune down the center frequency (to 2.5GHz) of 2500AT43A0100 soldered on the initial land pattern by matching circuits. Experiment 1: To shift up /down the center frequency of 2500AT43A0100 by changing the land pattern with no matching circuits (Fo @ 2.65GHz) Abstract f e d c g h i j j i h g c d e f GND Land pattern 1 (S22) j i h g c d e f GND Isolated GND Land pattern 2 (S33) Initial Land PatternÆ Pins 4 & 5 isolated. Land pattern 1Æ Connect pins 4 & 5 with GND Land pattern 2Æ Antenna pins 3 & 6 connected together and isolated from GND, pins 4 & 5 isolated as GND well Isolated GND Initial land pattern (S11) Experiment 1: Land Pattern Comparison -30 2.0 -25 -20 -15 -10 -5 0 2.2 2.4 freq, GHz 2.6 m1 m2 m3 2.8 3.0 m1 freq= 2.650GHz dB(S(1,1))=-25.234 m2 freq= 2.605GHz dB(S(2,2))=-18.205 m3 freq= 2.710GHz dB(S(3,3))=-26.905 Experiment 1: Measured Result Initial land pattern(S11)ÆCenter frequency is 2.65GHz Land pattern 1(S22)ÆCenter frequency is shift down 50MHz to 2.6GHz Land pattern 2(S33) Æ Center frequency shift up 60MHz to 2.71GHz dB(S(3,3)) dB(S(2,2)) dB(S(1,1)) f e d c g h i j GND Initial land pattern Experiment2: Land Pattern Image Matching circuits (next page) 0.5pF -50 -40 -30 -20 2.0 2.2 2.6 freq, GHz 2.4 m2 m1 2.8 3.0 m1 freq=2.650GHz dB(S(1,1))=-25.234 m2 freq=2.500GHz dB(S(2,2))=-42.777 2500AT43A0100 without matching circuits(S11)ÆCenter frequency is 2.65GHz 2500AT43A0100 with matching circuits(S22)ÆCenter frequency shift down to 2.5GHz Proposed matching circuits 0.5pF 4.7nH -10 0 2500AT43A0100 soldered on initial land pattern Experiment2: Return Loss & Matching circuits dB(S(2,2)) dB(S(1,1)) Peak -1.39 -8.67 -1.12 XY-plane H cut V cut Total -5.11 -14.03 -5.82 Avg. Total V cut H cut XZ-plane -1.63 -3.95 -2.50 Peak -4.47 -9.52 -6.97 Avg. Total V cut H cut YZ-plane 0.56 -1.46 -3.43 Peak Experiment2: Radiation Pattern @ 2.5GHz -2.17 -3.27 -9.03 Avg. Experiment 1: The results show that the center frequency can be shifted up/down by about 50MHz by changing the antenna land pattern. Experiment2: The center frequency can also be shifted down to 2.5GHz by the matching circuit (shown as the page5). Note: Combining experiments 1 & 2 can give the designer the desired Fo Summary