---
title: Design of Multi-Band Square Band Pass Filters Technical Paper
description: All dielectric band pass filters typically consist of all dielectric mirrors made up of quarter-wave optical thick layers and half-wave thick cavity layers.
---

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Technical Paper

## Design of Multi-Band Square Band Pass Filters

 All dielectric band pass filters typically consist of all dielectric mirrors made up of quarter-wave optical thick layers and half-wave thick cavity layers. The cavity layers can also be thicker as long as they have multiple half-wave optical thickness. Filters with a single cavity layer will have a triangular shape. Filters with multiple cavity layers can have a square shape. In this paper we will discuss what happens when the cavity layers are made very thick, resulting in multiple pass bands within the quarter-wave stack rejection region.

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