The inverter's active filtering during the load on mains with THDI less than 3%, power factor greater than 0.99% and harmonic attenuation
ratio is 96%.
The RF3482 also integrates 2170MHz filtering and harmonic attenuation
, reducing the need for a high loss/attenuation filter at the FEM output and increasing the output power at the antenna.
While achieving low insertion losses, enough harmonic attenuation was obtained by modifying the Chebyshev filter and the elliptic filter topologies to resonate at harmonic frequencies.
To achieve the high band-rejection level and harmonic attenuation level, four inductors are used to obtain series and parallel resonances.
Designed for use in harmonic rejection applications for cellular handsets, wireless PDAs and IEEE 802.11b WLAN, the filter provides second and third harmonic attenuation
levels of 35 dB and 25 dB, respectively, at a maximum insertion loss of 0.5 dB.
Finally, integrated harmonic attenuation
eliminates the need for additional filtering, therefore optimizing the efficiency and maximizing output power at the transmit port.
The physical length of the open-ended line is equal to a quarter-wavelength at the second harmonic of the input signal for high second harmonic attenuation
. The C-band suspended stripline BPFl shows the following electrical characteristics: insertion losses are less than 0.5 dB, the 3 dB bandwidth is 5.5 percent, the 20 dB bandwidth is 17 percent and the second harmonic attenuation
is greater than 40 dB.
Other salient features to the design in-elude dramatic improvements to harmonic attenuation over conventional VCOs and increased tolerance to load mismatching without costly isolating amplifier stages.
In addition, the CLV series exhibits improved harmonic attenuation over conventional VCOs on the market today.