A compact customizable tunable EBG filter

Abstract

A novel design for compact customizable tunable EBG (Electromagnetic Bandgap) filter is proposed. The tunable filter is implemented in RO4350 substrate using PCB (Printed Circuit Board) process with surface mounted solid-state varactors and lumped capacitors. Its frequency is tuned by adjusting applied voltages of the varactors. The filter is unique that it is capable to be tuned in customizable specified frequency range by selecting the lumped capacitors. The simulated and measured results of the proposed filter are found to be in good agreement. It is demonstrated that a two-pole filter with size of 3.20 × 3.90 × 1.52 mm 3 in PCB achieving performance of a tuning range of 5.3-6.3 GHz with a 1-dB fractional bandwidth below 6.35% and a constant insertion loss of 4.4 dB ² 0.2 dB.

Frequency-reconfigurable wideband bandstop filter using varactor-based dual-slotted defected ground structure

“…The centre frequency of the filter was from 4.5 to 5.5 GHz, of which tuning range is 20% and fractional bandwidth is 11.6 and 15.9%, respectively. Various reconfigurable electromagnetic bandgap structure (EBG) [15,16] and defected ground structures (DGS) have been proposed and applied for bandstop filters [15,17,18,19]. In [15], a microstrip (MS) BSF is designed by embedding three metamaterial-based electromagnetic bandgap structure (MTM-EBG) in a MS line to produce a bandstop filtering response, and placing a dielectric plate directly on the surface of the MTM-EBGs to make it tunable.…”

A compact triple-band bandpass filter with customizable frequencies

“…EBG filter/resonator [6,7,8,9,10,11,12] has attracted a lot of attention in recent years due to its high Qu (Unloaded Quality Factor), ease of integration with other RF front end components and low cost. Most recently, a Compact Configurable EBG (CEBG) filter was demonstrated to function at specifically selected working frequency by simply adjusting an external capacitor by this group [10].…”