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Basically you can use a 90-degree hybrid or L/C elements and replace the capacitors with varactor diodes. That should work fine for shortwave frequencies.
Here are some links you can find on any search engine for "90 degree hybrid phase shifter":
Phase Shifter Design Tutorial **broken link removed**
I have not tried. Judging from what these chips can do I think it is very possible. Give it a try.
I think it is far more clean than using PIN diodes which in principle designing switches (in most of cases) and using switches with pin diodes you achieve phase shifting.
The other kind of phase shifting is what is called reflection-type phase shifters which are similar to couplers but with the difference that electrical length of a transmission line controlling the shifting can be streerable change (hence steerable). I know these designs are employed by military.
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