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RF Cascade Workbook | RF Symbols for Office
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Werbel Microwave power dividers, couplers - RF Cafe



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Temwell Filters - RF Cafe

Please Help Sponsor RF Cafe for as Little as $40/Month
*** See Newest Banner Advertising Option for Multiple Companies ***

RF Cafe is a favorite of engineers, technicians, hobbyists, and students all over the world. With more than 17,000 unique pages in the Google search index, RF Cafe returns in favorable positions on many types of key searches, both for text and images. New content is added on a daily basis.

New Banner Advertising Plan (screenshot 10/24/2025) - RF Cafe

RF Cafe Banner Advertising scheme
(10/24/2024)

NOTE: I reserve the option to refuse ads which I do not feel are appropriate for the RF Cafe mission.

Website Traffic Trend 10/2023 - 3/2023

RFCafe.com Web Statistics October 2022 - March 2023

Banner Ad Impressions 12/21/2022 through 6/20/2023 - RF Cafe

The above chart shows Banner Ad impression rates for the 6-month period of 12/21/2022 through 6/20/2023. The average is around a quarter million per year (2 x 113.5k). Not included are the Highlighted Ads that appear on Vendor pages.

Things are looking up for RFCafe.com website statistics. The trend lines for Page Views, Visits, and New Visits all have a positive slope. I have put a lot of effort into making pages compliant with Google's "Mobile Friendly" requirements, so that probably has something to do with it. Also, you may have noticed that I have been modifying and re-publishing some of the earlier RF Cafe webpages. That involves updating the narrative, verifying hyperlinks (many go dead over time), and cleaning up older graphics. Much has changed in expectations from visitors - especially from the early days in the late 1990s and early 2000s. Competition for visitors is fierce. As always, thank you for your visitorship and stewardship.

Here is a real-time view of the Banner Ads in all eight positions.

Three plans are available. Please contact me, Kirt Blattenberger, with any questions.

  • Banner Plan:   $300/month
    Hyperlinked graphical Banner Ads in page borders
       + Highlighted Ad(s) on Vendor Pages
       + thumbnail logo in upper right corner
  • Standard Plan:   $40/month
    Hyperlinked Highlighted Ad on Vendor Pages
       + text listing in upper right corner
  • Self-Managed:  Google AdSense.
  • Both Plans: Hyperlinked thumbnail ads displayed in
        Espresso Engineering Workbook™ at no extra charge!

RF Cafe Banner Adversiting Details

Click here for more detail on the Banner Advertising Plan.

All Banners will be randomly displayed in any of the eight (8) page border positions (see screen capture at left, and info graphic at right), so every company's Banner will have an equal chance of appearing.

A random number generator determines which company's Banner Ad will go in a particular position*. I wrote the code myself and it is very simple and foolproof.

You provide one pair or two pairs of industry-standard Banner graphics are needed for page border impressions - one (or two) 120x450-px graphic for the vertical format and one (or two) 728x90-px graphic for the horizontal format, and also one 330x400-px graphic for the Highlighted Ad impressions on Vendor pages.

  • Term: 3 months
  • Price: A flat price of $300 per month is charged, with a standard 3-month term ($900/term).
    • Additional Banner Pairs* (up to a maximum of 3) may be purchased at discount rates to increase the odds that your company's Banner Ad will be displayed:
      • 1 Banner Pair  = $300/month
      • 2 Banner Pairs = $300 + $150 = $450/month
                                  (= $225/month/Banner Pair)
      • 3 Banner Pairs = $300 + 2*($150) = $600/month
                                  (= $200/month/Banner Pair)
      • 4 Banner Pairs =  $300 + 3*($150) = $750/month
                                  (= $187.5/month/Banner Pair)
    • * Each Banner Pair option adds another set of Banner Ads (120x450-px and 728x90-px) into the random display engine, thereby doubling your likelihood of being displayed. Unique Banner Ad designs and hyperlink URLs can be provided with each additional Banner Pair.
  • Banner Ad Specifications:

    728x90 - Width = 728 px, Height = 90 px

    120x450 - Width = 120 px, Height = 450 px

    File Format = JPG, GIF, or PNG (static, no animation)

    File Size = 45 kBytes (maximum)

    Hyperlink = Points to your company website

    A separate URL may be provided for each of the 2 Banners.
    Content = Text & graphics
  • Highlighted Vendor Page Ad Specifications:

    Width = 330 px, Height = 400 px

    File Format = JPG, GIF, or PNG (static, no animation)

    File Size = 45 kBytes (maximum)

    Hyperlink = Points to your company website

    Content = Text & graphic

    Vendor Page Placement = Up to 5 pages related to your products and/or services. Please review the Vendor Page list to determine where you would like to be (must pertain to your business). Additional pages are $5/page/month.

  • A unique Highlighted Ad graphic and hyperlink URL may be provided for each Vendor Page on which it is displayed.

Standard Highlighted Ad Pricing:

  • Price: $40/mo. for up to 3 Vendor pages on RF Cafe, and $3/mo. for each additional page.
  • These ads appear only on Vendor listing pages.
  • Ads contain textual content and a company logo.
  • Term: 6 months
  • Highlighted Vendor Page Ad Specifications:

    Width = 330 px, Height = 200 px

    File Format = JPG, GIF, or PNG (static, no animation)

    File Size = 35 kBytes (maximum)

    Hyperlink = Points to your company website

    Content = Text & graphics

    Vendor Page Placement = Up to 3 pages related to your products and/or services. Please review the Vendor Page list to determine where you would like to be (must pertain to your business). Additional pages are $3/page/month.

  • See Important Notes below.

Important Notes:

  • Pixel dimensions and maximum file sizes listed are firm. If you have trouble meeting the file size, I will be glad to help - there has never been an ad I couldn't fit into 45 kBytes.
  • You may provide an in industry standard 160x600-px Banner graphic, which will automatically be rendered in the 120x450-px format. File size of 45 kB still applies.
  • I do not collect page traffic or link click statistics for advertisements. Your website server statistical analysis is a much better reporter of inbound links from RF Cafe than I or anyone else can provide.
  • To the best of my knowledge the page layouts shown are representative of all pages on RF Cafe.
  • I make page layout changes from time to enhance performance.
  • The rel="sponsored" tag is inserted into all coded hyperlinks.
Temwell Filters - RF Cafe