RF Cafe Software
About RF Cafe
1996 - 2022
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
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In case you don't already know, a grown-up's version of the much-ballyhooed littleBits electronics building block system is available. Instead of assembling snap-together functional blocks for making LEDs flash or robotic carts, X-Microwave's system provides a relatively simple and inexpensive venue for designing and building RF and microwave circuits based on a selection of component blocks for frequencies ranging from hundreds of kHz to tens of GHz.
As you can see in the X-Microwave video below, functional blocks are screwed to a base plate with optimized interconnects providing low-VSWR, low-loss interfaces between blocks. Package sides, isolation compartment walls, and lids complete the system package with coaxial connectors at the I/O ports. The video does not indicate DC supply connections or RF path bends, but the website documentation shows it. You begin by laying out your complete system using the online Mechanical Layout Tool (MLT). An online system simulator (registration required for use) is provided that is powered by Keysight Technologies' Genesys Spectrasys using s- and x-parameter files.
Once your design is tested and optimized, the building blocks can either be mounted directly into a permanent machined enclosure or the block functions can be transferred to a custom printed circuit microwave substrate and placed in an enclosure. I did not see any mention of whether license fees apply for use of circuit blocks in a production environment when transferred to a custom substrate.
Prices for each functional block range from about $10 for a section of transmission line to $250 for an LO. A 5 GHz amplifier costs from around $80 to $150. A 1920 MHz bandpass filter costs $230, but can vary between $25 and $600 depending on your need. The basic prototyping metal base plate runs $600. Amplifier manufacturers include Mini-Circuits, RFMD (now Qorvo), and Hittite (now Analog Devices). Filters manufacturers include Dielectric Labs and Mini-Circuits. Mixers come from Marki Microwave and Mini-Circuits. Attenuator pads are from Mini-Circuits. Many of the function blocks must be in-house designs and list no specific manufacturer. Functional block interconnect 'anchors' are $10 apiece, and coaxial connectors run from about $10 up to $100. Machined housings with RF connector and control/power feedthrough holes range from $80 to $120. A full Prototype Station Kit with performance to 67 GHz with the base plate, test cables, and probes (connectors) costs $2000.
If you have a product concept that requires a relatively simple RF section and you do not want to spend potentially tens of thousands of dollars buying software and paying for prototype iterations, and especially if you do not have an experienced RF circuit and layout designer on staff, X-Microwave could be exactly what you need for success. University microwave labs could benefit greatly from such a system. Manufacturers of RF and microwave components - amplifiers, filters, circulators (none currently in the available parts list), couplers, dividers, oscillators, attenuators, terminations, etc. - might see this as great opportunity for getting designed into production circuits.
With enough participation, there might even be an enthusiastic X-Microwave user base that can establish open source functional blocks like the multinational littleBits Community.
These original Kirt's Cogitations™ may be reproduced (no more than 5, please) provided proper credit is given to me, Kirt Blattenberger.
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Cog·i·ta·tion [koj-i-tey'-shun] – noun: Concerted thought or
reflection; meditation; contemplation.
Kirt [kert] – proper noun: RF Cafe webmaster.
Posted January 18, 2016