Table 1 Comparison of the maximum group delay variation within the passband for the suggested dual-band filter and previously reported designs.

From: High-sensitivity dual-band microstrip sensor for oil–water mixture analysis with RBF neural network optimization

Ref

F0 (GHz)

Structure

Maximum variation of the group delay in

the passband (ns)

32

1.995

coupling a resistor-loaded microstrip line to a square open-loop resonator

3.3

33

2.3

lill-shape passive microstrip circuit

\(>8.1\)

34

4

T-shaped, patch, and stepped impedance

0.27

35

2.5

two different Defect Ground Structure techniques and three-pole hairpin resonator

\(>12.3\)

This work

1.2/14.92

Semicircular and isosceles trapezoid-shaped resonators

0.11/0.05

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