X‐band voltage‐controlled oscillator with built‐in envelope detection

Abstract

decreases with increasing R v , however, the stopband attenuation also decreases with increasing R v . This causes a trade-off between these two parameters. In this LTCC BPF design, we wish to achieve the passband insertion loss was lower than 2.0 dB, and the passband return loss was higher than 12 dB. The required stopband attenuation levels are set to values greater than 20 dB above 4.0 GHz to suppress the second harmonic band of the operating frequency. The final prototype element solutions that are chosen to satisfy all the specifications are: C c 5 1.68 pF, L p1 5 0.529 nH, C p1 5 6.86 pF, R 5 255 X. By referring to Figure 4, the U-shaped inductor requires a length of 1.98 mm for having such a specific L p1 value of 0.529 nH.