Stripline filters

 FSY Microwave, Inc. (Cavity/Combline/Interdigital) These TEM mode filters consist of inductively coupled short circuited stub resonators. For very wide passband applications, interdigital structures are used.

 Microstrip Patch Antennas Technical Introduction.

Calculation Aids

 Stripline Impedance An on-line impedance calculator

Tools at  www.automata.com

 Cross Talk (Lateral) calculator
  Cross Talk (Vertical) calculator

 Microstrip Impedance and Capacitance Calculator
 Embedded Microstrip Impedance and Capacitance Calculator
 Stripline Impedance and Capacitance Calculator
 Dual (Asymmetric) Stripline Impedance and Capacitance Calculator

 Dual Stripline Noise Budget (Asymetric) Dual (Asymmetric) Stripline Noise Budget Modeling

 Compunetics:  Controlled Impedance Design Formulas

 Microstrip
 Embedded Microstrip
 Balanced Stripline
 Dual Stripline
 Coupled Stripline

 EMAP A Computer Program for Electromagnetic Analysis of Printed Structures in a Planarly Layered Medium version 1.1
"Printed structures in a planarly layered medium have advantages in many applications. They have low cross-section and weight which is important in air-borne applications such as a flush mounted microstrip antenna on a missile. In addition, they are rugged, easily produced and reproducible with low effort by photographic techniques. The advances in Monolithic Microwave Integrated Circuits (MMIC) increases the importance of microstrip and stripline structures ...
Some Examples and details of experiments ..."

 Stripline 3-dB 90 Hybrid Coupler

Open Design Circuits are the chip design counterparts of Open Source Software, with designs (sources) openly shared among developers and users. The open-design circuit approach outlined here captures the true advantages of open-source software, and applies them to hardware. It avoids the large initial investments usually needed for hardware development, and it allows for the rapid design sharing, testing, and user feedback which are key to open-source software success.

gEDA is a collection of tools which are used for electrical circuit design, simulation and prototyping/production. The gEDA project was started because of the lack of free EDA tools for
UNIX. The tools are being developed mainly on GNU/Linux machines, but considerable effort is
 being made to make sure that gEDA runs on other UNIX variants.

Gwave is a tool I recently started writing, using the Gtk+ toolkit. Its purpose is for viewing analog data, such as the output of Spice simulations.

XCircuit is my UNIX/X11 program for drawing publishable-quality electrical circuit schematic diagrams and related figures. Graphically object-based, it can be used as a generic program for drawing just about anything, and is competitive with powerful programs such as "xfig". It is especially good for any task requiring repeated use of a standard set of graphical objects, including architectural drawing, printed circuit board layouts, and (my personal favorite) music typography (see my Music Page for examples).

 Open Design Circuits: Interesting Links

 ETH Zürich / Computer Science / CAD Tools

The Institute for Computer Systems has a long tradition in creating both hardware and software systems. Typically, these two aspects of system design are treated separately. Modern Field-Programmable Gate Arrays (FPGAs), however, have reduced the gap between hardware and software. Our group's research focuses on tools which make the construction of hardware in the form of FPGA designs a fast and simple process. The systems we have built are used in education and research.
The CAD Tools were written by Prof. N. Wirth ⁽¹⁾  , Stephan Gehring, Stefan Ludwig and Marco Sanvido.

 FreeHDL index Page A project to develop a free, open source, GPL'ed VHDL simulator for Linux!

 VAUL - a VHDL Analyzer and Utility Library it is now a serious canditate for the VHDL frontend of the FreeHDL project.

 Alliance Home Page "Alliance VLSI CAD System" is free Software.

 Electric - GNU Project - Free Software Foundation (FSF)

Electric is a sophisticated electrical CAD system that can handle many forms of circuit design, including:

     Custom IC layout (ASICs)
     Schematic drawing
     Hardware description language specifications
     Electro-mechanical hybrid layout
 online user's manual

 OCEAN  the sea-of-gates design system

 HP Search Results Component applications notes

Applications of PIN Diodes
 An SPDT PIN Diode T/R Switch for PCN Applications

 Appnotes from Impellimax

 Noninverting High Speed PIN Diode Drivers
 Binary Input Dual-Output Linearizer for GaAs MMICs
 Design and Assembly of a DC/IF Subsystem
etc

(1) I have followed this gentlemans work since his first publications and the development of structured software.
     I have found his guidance invaluable.