Waveguides
Waveguides, or the word waveguides, is not a single entity. In very simple terms, waveguides are structures that "guide" waves along a certain path. These waves can be generated from several sources such as electromagnetic sources, light sources, and sound sources. Each of these sources, or waves, is different than the others and each requires its own knowledge base.
For the general hobbyist of electronic study, it may not be necessary to understand all of the principles of waveguides in each spectrum or area. If you are interested in electromagnetic waveguides, you can concentrate your studies in that area and leave the others for later study.
Waveguides in the electromagnetic area include those waves that are carried through the electromagnetic spectrum as well as those issues associated with power transmission through transmission lines. This type of source is used for transmitting both power and communications.
Other types of waveguides are in the optical realm. This can be a somewhat complex field of study but it is necessary if you wish to learn more about fiber optics and how they work. As time goes by more material is becoming available on this subject and much of that is now online and available for you to read.
There are also acoustic waveguides. These, as you might imagine, are related to the transmission of sound. In this particular area there is usually a physical structure involved with the system. Any type of duct that can carry sound can be thought of as a transmission line for acoustic waveguides. The medium for transmission can be air or any other materials that will carry sound.
There are also digital waveguides for sound synthesis. These often incorporate the use of digital filters and other materials in order to achieve the desired results.
As you can see, there are waveguides for many applications and they are not all the same. Each has its own underlying principles and theories and each should be studied as a entity unto itself. What might apply in the optic waveguides may not apply in the electromagnetic waveguides.
For this reason it is often easier to begin with the area that most interest you and learn as much as you can in that area before moving on to another. As mentioned above, there is a lot of information available for the various types of waveguides. Much of this can be found online and in your local library. Some people may wish to take an online class on the principles of waveguides, which can actually be a very good way to get the basics down.