Filters and Stubs

Coupled line, hairpin, and stepped-impedance low pass filters; radial stubs

Use the filter and stub objects and functions to create and visualize filters and stubs used in a printed circuit board (PCB).

RF and microwave filters are used to select or reject a particular band of frequencies in receivers, transmitters, and frequency synthesizers.

Radial stubs are used in antenna impedance matching circuits, frequency selective filters, and resonant circuits for UHF electronic oscillators and RF amplifiers.

Objects

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Filters

`filterCoupledLine`	Create coupled line filter in microstrip form
`filterHairpin`	Create hairpin filter in microstrip form
`filterStepImpedanceLowPass`	Create stepped impedance lowpass filter in microstrip form
`filterCombline`	Create combline filter in microstrip form
`filterStub`	Create stub filter in microstrip form
`filterSpurline`	Create spurline bandstop filter in microstrip from
`filterOpenLoop`	Create open-loop band pass filter in microstrip form
`filterInterdigital`	Create interdigital filter in microstrip from

Stubs

stubRadialShunt Create single- and double-radial stub shunt on X-Y plane

Functions

`show`	Display PCB component structure or PCB shape
`info`	Display information about PCB component structure
`pcbcascade`	Create new component using cascade operation
`shapes`	Extract all metal layer shapes of PCB component

Featured Examples

Model and Analyze Microstrip Diplexer using Open Loop Resonator

Model and analyze a microstrip diplexer with the open loop resonator using RF PCB Toolbox.

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Miniaturization and Bandstop region improvement of stub filter using Double Spurline

How to introduce a double spurline into a conventional open stub filter for filter circuit size miniaturization and bandstop region improvement using RF PCB Toolbox.

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Microstrip Ultra-Wideband Bandpass Filter with Cascaded Broadband Bandpass and Bandstop Filters

Create a compact ultra-wideband filter by connecting a broadband bandstop filter with a broadband bandpass filter.

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UWB Bandpass Filter Using Open and Short-Circuited Stubs

Create an open or short circuited stub filter using the filterStub catalog and analyze the filter using RF PCB Toolbox.

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Comparison of Lumped and Distributed EM Models for Low Pass Filters

Compare lumped and distributed electromagnetic (EM) model for low pass filters.

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Variations of Open and Short Stub Filters

Analyze the open and short stub filters using RF PCB Toolbox.

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Microstrip Composite Bandpass Filters for Ultra-Wideband (UWB) Wireless Communications

Design and analyze a Low Pass Filter(LPF), High Pass Filter(HPF), and cascade responses of the LPF and HPF as well as two variations of a composite filter as shown in the paper[1].

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Stepped Impedance Maximally Flat Lowpass Filter for Microwave Applications

Comparison of S-parameters of simulated and lumped element stepped impedance low pass filter for X-band applications.

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Bandstop and Bandpass Filters with Open Microstrip Line Stubs Using Behavioral and EM Simulation

Different ways to create microstrip Line bandpass and bandstop filters using open circuit stub.

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Design and Analysis of Hairpin Micro-Strip Line Bandpass Filter

Design and analyze Hairpin filter in RF PCB Toolbox™.

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