Share this project

Done

Share this project

Done
The xaVNA is portable, easy to use, and allows S parameter export.
The xaVNA is portable, easy to use, and allows S parameter export.
68 backers pledged CA$ 20,157 to help bring this project to life.
Last updated

About

xaVNA - a full featured, low cost two port VNA project video thumbnail
Replay with sound
Play with
sound

xaVNA - a full featured, low cost two port VNA

CA$ 20,157

68

What is a prototype?

A prototype is a preliminary model of something. Projects that offer physical products need to show backers documentation of a working prototype. This gallery features photos, videos, and other visual documentation that will give backers a sense of what’s been accomplished so far and what’s left to do. Though the development process can vary for each project, these are the stages we typically see:

Proof of Concept

Explorations that test ideas and functionality.

Functional Prototype

Demonstrates the functionality of the final product, but looks different.

Appearance Prototype

Looks like the final product, but is not functional.

Design Prototype

Appearance and function match the final product, but is made with different manufacturing methods.

Production Prototype

Appearance, function, and manufacturing methods match the final product.

E3813b46a2633bca34fe14e54b0e4733 original.jpg?ixlib=rb 2.1

Prototype Gallery

These photos and videos provide a detailed look at this project’s development.

The xaVNA is a two port VNA with a typical frequency range of 137MHz to 3.5GHz, and a guaranteed frequency range of 140MHz to 2.5GHz. It plugs directly into USB and requires no additional power supply. All measurements are done using an intuitive and easy to use UI on a computer.

It is both open source hardware and open source software, with a GitHub repository containing all schematics, PCB layouts, FPGA VHDL, and software that will be kept updated during development:

https://github.com/xaxaxa/vna

Stretch goal: C$25,000

We will introduce a 10MHz to 2.5GHz version if budget permits.

What can you do with the xaVNA?

A VNA (Vector Network Analyzer) allows you to measure the impedance of an arbitrary device (such as an antenna) across a wide range of frequencies, as well as the transmission coefficient (gain/loss and phase) of a two port device (such as an amplifier, filter, or isolator).

It can do everything an antenna analyzer can do, but 10x better: it gives you phase information as well, and lets you see the exact complex impedance of an antenna, allowing you to easily design matching networks without tedious trial and error tuning.

What makes the xaVNA superior?

  • Less trace noise than other low cost VNAs on the market (see graphs below)
  • No warm-up needed: achieves spot-on measurements within 1 minute of power up
  • Entirely powered from USB; no power adapter needed
  • Open source hardware & software
  • Lower cost

How accurate is it? What are the specs?

  • Frequency range (guaranteed): 140MHz to 2.5GHz
  • Frequency range (typical): 137MHz to 3.5GHz (achieved in iteration 1 prototype)
  • Signal level: -20dBm to 10dBm (achieved in iteration 1 prototype)
  • S11 trace noise: <<0.1dB (achieved in iteration 1 prototype)
  • S11 dynamic range: >50dB (achieved in iteration 1 prototype)
  • S21 dynamic range: target >=70dB (achieved 50dB in iteration 1 prototype)
  • Dimensions of the VNA board: 10cm x 10cm
  • Weight: <200g
  • Interface: Micro USB
  • RF ports: SMA Female
  • Current draw: ~500mA @ 5V
  • Windows, Linux, and Mac OS will be supported

Accuracy comparison (measured vs simulated):

 

Comparison to other low cost VNAs on the market:

See last page of http://www.gsm-modem.de/M2M/wp-content/uploads/2014/04/IoT-M2M-Cookbook-Harald_excerpt.pdf

What is the current status of the project?

We have a fully functional prototype on a 2-layer PCB, as shown in the demo. For iteration 2 all the wiring (including the coaxial cables) will be eliminated and everything will be on one board, to prepare for mass production. The iteration 2 PCB has already been designed and is now undergoing DFM verification.

What does the final product look like?

(latest prototype)

The full two-port version will be a similar but slightly larger PCB (estimated 10cm x 15cm).

If time and budget permits, we may include an acrylic case.

Software and interfacing

Software will be provided for Windows, Linux, and Mac OS. An API (in C/C++) will be provided to control and read data from the VNA from your application. All code will be licensed under the GPLv2 and will be available on GitHub.

A screenshot of the software in development:

(Measuring a 900MHz power amplifier)

Features:

  • SOL calibration
  • Smith chart
  • Impedance, admittance, and series/parallel equivalent value display
  • S parameter export (s1p and s2p)
  • S11, S21, S22, S12 magnitude/phase plots
  • Distance to fault graph
  • Persistence plot

Calibration kit

The provided calibration kit will consist of 3 SMA female connectors (for short/open/load), one SMA-f to SMA-f adapter (for through), and 2x 100ohm precision resistors. The references need to be soldered like so:

If you would like the calibration references pre-soldered (at no charge), leave a remark with your pledge. 

What is the difference between the T/R version and the full two port version?

A T/R VNA allows you to measure S11 and S21, that is reflection coefficient on port 1 and transmission from port 1 to 2. To measure S22 and S21 you will need to physically reverse the DUT. The full two port version has a directional coupler and signal source on both ports, allowing you to measure S11, S21, S12, and S22 as well as calibrate with an unknown length through reference.

Risks and challenges

The T/R version iteration 1 prototype is fully working and achieves almost all of the target specs, and iteration 2 DFM (design for manufacturability) is close to completion. A quotation has been received for all parts and PCB assembly. This is our first time designing something for manufacture in volume, but we are confident in being able to deliver given the above.

The full two port version will require more R&D.

Learn about accountability on Kickstarter
Questions about this project? Check out the FAQ

Support

  1. Select this reward

    Pledge CA$ 1 or more About $1

    Support open source hardware

    Support the development of fully open source hardware and software.
    You will also get included in project updates and a big thank you for your support.

    Less
    Estimated delivery
    6 backers
    CA$

    By pledging you agree to Kickstarter's Terms of Use, Privacy Policy, and Cookie Policy.

    Kickstarter is not a store.

    It's a way to bring creative projects to life.

    Learn more about accountability.
  2. Select this reward

    Pledge CA$ 279 or more About $215

    xaVNA T/R

    (~$223 USD) Get one xaVNA unit. Measures S11 and S21. Includes VNA board (fully assembled). Micro USB cable and SMA cables NOT included.

    Less
    Estimated delivery
    Ships to Anywhere in the world
    0 backers
    CA$

    By pledging you agree to Kickstarter's Terms of Use, Privacy Policy, and Cookie Policy.

    Kickstarter is not a store.

    It's a way to bring creative projects to life.

    Learn more about accountability.
  3. Select this reward

    Pledge CA$ 299 or more About $231

    xaVNA T/R + cal kit

    (~$239 USD) Get one xaVNA unit. Measures S11 and S21. Includes VNA board (fully assembled) and calibration kit (requires soldering). Micro USB cable and SMA cables NOT included.

    Less
    Estimated delivery
    Ships to Anywhere in the world
    3 backers
    CA$

    By pledging you agree to Kickstarter's Terms of Use, Privacy Policy, and Cookie Policy.

    Kickstarter is not a store.

    It's a way to bring creative projects to life.

    Learn more about accountability.
  4. Select this reward

    Pledge CA$ 518 or more About $399

    xaVNA T/R + cal kit x2 - Early Bird

    (~$410 USD) Get two xaVNA units and calibration kits. Measures S11 and S21. Includes VNA board (fully assembled) and calibration kit (requires soldering). Micro USB cable and SMA cables NOT included.

    Less
    Estimated delivery
    Ships to Anywhere in the world
    0 backers
    Limited (10 left of 10)
    CA$

    By pledging you agree to Kickstarter's Terms of Use, Privacy Policy, and Cookie Policy.

    Kickstarter is not a store.

    It's a way to bring creative projects to life.

    Learn more about accountability.
  5. Select this reward

    Pledge CA$ 649 or more About $500

    xaVNA two-port

    (~$520 USD) Get one xaVNA full two-port unit. Measures S11, S21, S12, S22. Includes VNA board (fully assembled). Micro USB cable and SMA cables NOT included.

    Less
    Estimated delivery
    Ships to Anywhere in the world
    1 backer
    CA$

    By pledging you agree to Kickstarter's Terms of Use, Privacy Policy, and Cookie Policy.

    Kickstarter is not a store.

    It's a way to bring creative projects to life.

    Learn more about accountability.
  6. Select this reward

    Pledge CA$ 669 or more About $515

    xaVNA two-port + cal kit

    (~$536 USD) Get one xaVNA full two-port unit. Measures S11, S21, S12, S22. Includes VNA board (fully assembled), and calibration kit (requires soldering). Micro USB cable and SMA cables NOT included.

    Less
    Estimated delivery
    Ships to Anywhere in the world
    7 backers
    CA$

    By pledging you agree to Kickstarter's Terms of Use, Privacy Policy, and Cookie Policy.

    Kickstarter is not a store.

    It's a way to bring creative projects to life.

    Learn more about accountability.
  7. Reward no longer available

    Pledge CA$ 249 or more About $192

    xaVNA T/R + cal kit - Super Early Bird

    (~$199 USD) Get one of the first 10 units of the xaVNA. Measures S11 and S21. Includes VNA board (fully assembled), and calibration kit (requires soldering). Micro USB cable and SMA cables NOT included.

    Less
    Estimated delivery
    Ships to Anywhere in the world
    Reward no longer available
    10 backers
    CA$

    By pledging you agree to Kickstarter's Terms of Use, Privacy Policy, and Cookie Policy.

    Kickstarter is not a store.

    It's a way to bring creative projects to life.

    Learn more about accountability.
  8. Reward no longer available

    Pledge CA$ 259 or more About $200

    xaVNA T/R + cal kit - Early Bird

    (~$207 USD) Get one xaVNA unit. Measures S11 and S21. Includes VNA board (fully assembled), and calibration kit (requires soldering). Micro USB cable and SMA cables NOT included.

    Less
    Estimated delivery
    Ships to Anywhere in the world
    Reward no longer available
    40 backers
    CA$

    By pledging you agree to Kickstarter's Terms of Use, Privacy Policy, and Cookie Policy.

    Kickstarter is not a store.

    It's a way to bring creative projects to life.

    Learn more about accountability.

Funding period

- (60 days)

Line icon alert icon Artboard Copy 8 arrow-down icon arrow-down arrow-left icon arrow-left arrow-point-left icon Fill 1 Copy 5 arrow-point-right icon Fill 1 arrow-right icon arrow-right arrow-up-right icon icon--arrow-up-right copy bar-chart icon Artboard Copy 6 bell icon Combined Shape Copy 5 book icon Artboard Copy 3 bookmark icon Fill 1 brand-assets icon Artboard Copy 13 cart icon Artboard Copy 4 chat icon chat check icon Fill 1 Copy 6 circle-back icon Fill 1 Copy 13 circle-forward icon Fill 1 Copy 16 circle-k icon circle-k circle-left icon circle-left circle-right icon circle-right clipboard icon Artboard Copy 12 clock icon Combined Shape close icon close closed-caption icon Fill 1 compass icon Combined Shape Copy 2 conversion icon conversion delta-down icon Fill 1 delta-left icon delta-right icon Fill 1 delta-up icon Fill 1 duplicate icon duplicate embed icon Combined Shape Copy 6 eye icon Combined Shape Copy 12 facebook-contained icon Facebook Contained facebook icon Facebook logo flag icon Fill 1 Copy 3 gear icon Fill 1 Copy 14 global-africa icon Fill 1 Copy 9 global-america icon Fill 1 Copy 10 global-asia icon Fill 1 Copy 17 graph-bar icon Combined Shape Copy 9 graph-line icon Combined Shape Copy 16 heart icon Fill 1 Copy 8 help icon human icon icon--human icon--alarm icon icon--alarm icon--alert icon icon--alert icon--arrow-down icon icon--arrow-down icon--arrow-left icon icon--arrow-left icon--arrow-right icon icon--arrow-right icon--arrow-up-right icon icon--arrow-up-right icon--arrow-up icon icon--arrow-up icon--backer-badge icon icon--backer-badge icon--bell icon icon--bell icon--bolt icon icon--bolt icon--bookmark-outline icon icon--bookmark-outline icon--bookmark icon icon--bookmark icon--calculator icon icon--calculator icon--calendar-check icon icon--calendar-check icon--calendar icon icon--calendar icon--campaign-outline icon icon--campaign-outline icon--check icon icon--check icon--chevron-down icon icon--chevron-down icon--chevron-left icon icon--chevron-left icon--chevron-right icon icon--chevron-right icon--chevron-up icon icon--chevron-up icon--circle-around icon icon--circle-around icon--circle-back icon icon--circle-back icon--circle-forward icon icon--circle-forward icon--circle-loader icon Page 1 icon--circle icon icon--clipboard icon icon--clipboard icon--clock icon icon--clock icon--closed-caption icon icon--closed-caption icon--code icon icon--code icon--collapse icon icon--collapse icon--commissions icon icon--commissions icon--compass icon icon--compass icon--confirmation icon icon--confirmation icon--conversion icon icon-conversion icon--cpu icon icon--curve-right icon icon--curve-right icon--cross icon icon--cross icon--delta-down icon icon--delta-down icon--delta-left icon icon--delta-left icon--delta-right icon icon--delta-right icon--delta-up icon icon--delta-up icon--download icon icon--download icon--ellipsis icon icon--expand icon icon--expand icon--external icon icon--external icon--eye icon icon--eye icon--facebook icon icon--facebook icon--filter icon icon--filter icon--flag icon icon--flag icon--frown-filled icon icon--frown icon icon--gear icon icon--gear icon--globe-africa icon icon--globe-africa icon--globe-america icon icon--globe-america icon--globe-asia icon icon--globe-asia icon--graph-bar icon icon--graph-bar icon--graph-line icon icon--graph-line icon--happy-filled icon icon--happy icon icon--heart-outline icon icon--heart outline icon--heart-thin-outline icon Fill 1 icon--heart icon icon--heart icon--home icon icon--home icon--home-with-door icon icon--human icon icon--human icon--humans icon icon--humans icon--image icon icon--image icon--inbox icon icon--inbox icon--info icon icon--info icon--instagram icon icon/instagram icon--lightbulb icon icon--lightbulb icon--link icon icon--link icon--lock-black-bg icon lock-icon icon--lock icon icon--lock icon--mail icon icon--mail icon--meh-filled icon icon--meh icon icon--menu icon icon--menu icon--message icon icon--message icon--mobile icon icon--mobile icon--overflow icon icon--overflow icon--pause icon icon--pause icon--pencil icon icon--pencil icon--pin icon icon--pin icon--pinterest icon icon--pinterest icon--play icon icon--play icon--plus-human icon icon--plus-human icon--plus icon icon--plus icon--prohibit icon icon--prohibit icon--project-budget icon icon--pull-quote icon icon--pull-quote icon--question-filled icon icon--question-filled icon--question icon icon--question icon--reorder icon icon-reorder icon--reply icon icon--reply icon--save icon icon--save icon--saved icon icon--saved icon--search icon icon--search icon--section-break icon icon--section-break icon--small-k icon icon--sound-hi icon icon--sound-hi icon--sound-lo icon icon--sound-lo icon--sound-mute icon icon--sound-mute icon--star-outline icon Star Outline icon--star icon icon--star icon--subtitles-captions icon icon--subtitles-captions icon--text-bold icon icon--text-bold icon--text-bullet icon icon--text-bullet icon--text-italic icon icon--text-italic icon--textalign-centered icon icon--textalign-centered icon--textalign-right icon icon--textalign-right icon--thumbs-down icon icon--thumbs-down icon--thumbs-up icon icon--thumbs-up icon--thumbsdown-outline icon icon--thumbsdown-outline icon--thumbsup-outline icon icon--thumbsup-outline icon--trash icon icon--trash icon--tumblr icon icon--tumblr icon--twitter icon icon--twitter icon--unlink icon Artboard icon--unlock icon icon--unlock icon--update-freeform-round icon icon--update-freeform-round icon--update-freeform icon icon--update-freeform icon--update-pinned icon Artboard icon--update-qa-round icon icon--update-qa-round icon--update-qa icon icon--update-qa icon--upload icon icon--upload icon--video icon icon--video icon--youtube icon icon--youtube icon-imagealign-center icon icon-imagealign-center icon-imagealign-left icon icon-imagealign-left icon-imagealign-right icon icon-imagealign-right info icon Combined Shape Copy instagram icon instagram copy kickstarter icon Artboard Copy 5 leaf icon leaf lightbulb icon icon--lightbulb link icon Combined Shape Copy 8 loading-spin icon lock icon Combined Shape Copy 4 mail icon Combined Shape map-pin icon Fill 1 menu icon Group message icon Fill 1 Copy 12 mobile icon Page 1 Copy 2 pause icon pause copy pencil icon Combined Shape Copy 3 pin icon Combined Shape Copy 11 pinterest icon pinterest play icon play copy plus-human icon icon--plus-human plus icon Fill 1 Copy 7 question icon Combined Shape Copy 14 search icon Fill 1 Copy 11 shapeshift icon share icon Fill 1 Copy slash icon solid-arrow icon solid-arrow sound-hi icon Combined Shape sound-lo icon Combined Shape sound-mute icon Combined Shape star icon Fill 1 Copy 2 stopwatch icon Group 2 thumbs-up icon Shape tools icon Shape trash icon Combined Shape tumblr icon tumblr copy twitter icon twitter copy user icon Artboard Copy 10 volume-up icon Artboard Copy 9 warning icon Combined Shape Copy 10 write icon Artboard Copy 11 x icon Fill 1 Copy 4 youtube icon Combined Shape