Hello everybody! I have a problem with developing a compact antenna for the 1MHz-5MHz frequency range. Tell me what type of antenna can be used and what books and articles to read to perform this task?
You need to read a book on electrically small antennas such as
Small Antenna Handbook
Robert C. Hansen, Robert E. Collin
Read papers by Wheeler, on small antennas. At 5 MHz a quarter wave is 15 metres, so any compact antenna is going to be way below 1/10 wavelength across so will be electrically small.
Frequency band on which you are trying to design antenna are realized using ferrite rod type antenna. In this concept a ferret rod typical diameter around 10 to 12 mm is taken . over which a copper coil is wounded and output is taken. This is is being used in old analog broadcast receiver. even today we find it. In second concept you can go for very high epsilon (permittivity) may be order of 100 to 200 but getting this or realizing is tough and (this the current topic of material science) go for conventional patch antenna. remember there is difference between patch antenna and microstrip patch. first is non resonance and letter is resonance antenna. As for as book and literature you need to refer old sixty IEEE AP or physics journal. they give nice detail.
I think ferrite coil antennas are good for receiving when the noise in the environment is very high, because they are very insensitive, but the signal needs to be big to be above the noise, so the antenna is suitable for receiving a very large signal in large noise. It is not good for transmitting because of the very low efficiency.
Dear Malcolm White sir It is common practice that unless it is specifically mention that antennae is for transmitting application, otherwise it will be understood for receiving application and accordingly description are given.
secondly even today ferrite coil antennas are used for reception of word wide time broadcast signal. This is operated at 5Mhz. frequency and signal level in order of -80 to -100 dBm.
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