Microstrip Resonator Basics and Types

microstrip resonator
resonator type
filter design
resonant frequency
microwave engineering

This article delves into the world of microstrip resonators, covering their fundamentals and various types. We’ll explore open-end resonators, stub resonators, ring resonators, and dielectric resonators.

Microstrip resonator types

Figure 1 illustrates different kinds of microstrip resonators. As we know, boundary conditions dictate that circuits resonate at specific frequencies.

Open-end resonators and stub resonators exhibit a voltage wave maximum at their open edges. Consequently, resonance occurs for an open-end resonator when the following condition is met:

l = n *(1/2)*λg , where n = 1, 2, 3…

For an open stub resonator, resonance is achieved when:

l = n *(1/4) * λg , where n = 1, 2, 3…

For a ring resonator, the condition for resonance is:

2 * π * r = n * λg , where n = 1, 2, 3…

The resonant frequencies can be determined using the following equation:

λg=λ0/(εeff)0.5=c/(f\*(εeff)0.5)λg = λ0 / (εeff)0.5 = c / (f \* (εeff)0.5)

One key application of resonators is in the design of filters.

There are four primary types of filters:

  • LPF (Low Pass Filter)
  • HPF (High Pass Filter)
  • BPF (Band Pass Filter)
  • BSF (Band Stop Filter)
Pi Filter Calculator: LC High Pass Filter Design

Pi Filter Calculator: LC High Pass Filter Design

Design a Pi LC high pass filter for impedance matching using this calculator. Input cutoff frequency and impedance to find inductance and capacitance.

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