Spherical Harmonics and Antennas modelling
Modeled base station antenna Near field reconstruction
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The near-field of the antenna is reconstructed from its far-field pattern
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The reconstructed field is accurate at few centimetres from the antenna
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The model is integrated in commercial software
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Published in IEEE APW Letter 2002
Microstrip Cross-Hairpin Filters
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Filters response: (m1): -3,3 dB at 1176 MHz (m2): -3,3 dB at 1164 MHz (m3): -3,8 dB at 1188 MHz
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Filter rejection: (m5): -39,4 dB at 1246 MHz
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Filter return loss: (m4): -21,6 dB at 1176 MHz
Simulated and measured response RF filter layout
Fabricated filters
Image Reject Mixers (IRM)
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IRM: Hybrid coupler 0°/90°, single-ended to differential drivers, IQ modulator
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Image rejection over 30 dBc
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LC Impedance matching: LO (55,8+j 4) RF (47,9 +j 4,7)
PCB Layout
Electrical scheme
50Ω matching
Frequency Synthesiser
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LO carrier for L1 frequency: -6dBm at 1645,42 MHz
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Low phase noise: 14 mrad (1Hz-10kHz)
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Loop filter : 20 kHz cut off, 45° phase margin
Electrical scheme Phase noise measurement
PCB Layout