Paul
There are some pretty decent texts and articles that may help you grasp
stripline and coaxial amplifier circuits, if you'd like to know more than just
cutting and trying approach. The west coast Radio Handbooks by Bill Orr, W6SAI,
were especially good in this regard, from 20th edition up. He worked at Eimac
with Sutherland and other high power amplifier experts there. Chapter 8 of the
ARRL UHF/Microwave Experimenters Manual, and older RSGB VHF/UHF manual are also
resources. One particular series of articles in Ham Radio magazine by H. Meyer,
W6GGV, tweaked my interest and really gave me a better understanding of the
various methods of making transmission lines and using them to match tubes in
amplifier circuits at very high frequencies and above. The dates of these
articles, "Transmission Line Circuit Design", were Nov. 1980, Jan. 1981, Feb.
1981, March 1981 and April 1981. These magazines may be available on CD or
download these days.
It's a really interesting aspect of radio design, where distributed circuits
kick in, along with using lumped element approximations. Good luck, and
remember, your GDO and a network analyzer are your best friends in this regime.
73
John K5PRO
> I've had a casual interest in how striplines work for a while, but not to the
> point that I have started a detailed study. You've provied a great
> explanation. From what I can gather, the "stripline" is just being used in
> the same way as for example a coaxial transformer. The difference is "we"
> are creating the coax out of the equipment case and the bar connected to the
> tube anode. Based on the bar size and the case size, the impedance is
> determined. This seems very similar in idea to calculating impedance of a
> coax cable by using the 138log(D/d) equation. If this is roughly true, then
> increasing the strip size, thereby reducing the distance between the strip
> and the case will make the impedance lower, this would be the case of
> extending the strip on one end.
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