PROJECT TITLE :
3- to 5-GHz Ultra-Compact Bandpass Filter With Independent Transmission Zeros Using PCB Embedding Passive Technology
ABSTRACT:
A compact ultra-wideband bandpass filter was newly designed and implemented by embedding all the passive elements into a printed circuit board with a high dielectric composite film layer. It was designed employing a modified third-order Chebyshev circuit topology to obtain a massive bandwidth. $J$-inverter transformation technology was then applied in order to reduce the size of the filter and avoid unwanted electromagnetic coupling among the filter circuit components. A capacitor and 2 inductors connected in series with three parallel resonators were newly applied to generate 3 freelance transmission zeros for improving the rejection characteristics at the lower and higher stopbands of the proposed filter. The measured maximum insertion loss in the passband vary from 3.one to 4.75 GHz was higher than 1.sixty eight dB and therefore the return loss was beyond twelve dB. The transmission zeros of the measured response occurred at a pair of.2 and five.fifteen GHz and provided suppressions of thirty one and 20 dB within the wireless local space networks bands of 2.four and five.fifteen GHz, respectively. The group delay in the passband was lower than 0.62 ns. The dimensions of the fabricated filter was a pair of.9$,times,$2.eight$,times,$zero.fifty five $(rm H),rm mm^3$.
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