ANTENTOP- 01- 2011 # 015

Low Profile Antennas for the 435- MHz Band

Figure 5 DD of the Antenna "Shaiba"for the 435- MHz Band

Data and Stuff for the Antenna: Antenna may be made from a copper wire in diameter 1.8- 2.2- mm (11- 14 AWG). Perimeter of the hat (it may be circular or polygon) is 234- mm. Vertical two wire line has length 62- mm, distance between the wires is 20-mm. One of the wire of the line is grounded another wire is connected to the central core of the 50-Ohm coaxial cable. Braid of the coaxial cable is grounded.

Like a ground it may be served a copper disk in diameter not less 320-mm or 3 counterpoises in length of 168- mm radially connected to a small disk (base of the antenna) in diameter of 30- 50- mm .

Sizes of the ground may be decreased if the gap between the ground and metal auto body is a small.

For example here is shown a prototype of the Antenna "Shaiba"- lambda/4 stub Antenna. Figure 6 shows design of the antenna. Figure 7 shows Z of the lambda/4 stub Antenna. Figure 8 shows DD of the lambda/4 stub Antenna. . File MMANA for the lambda/4 stub Antenna (designed for the 435- MHz Band) may be downloaded from:

http://www.antentop.org/015/low_profile_antennas_015

Figure 6 Design of the prototype of the Antenna "Shaiba"- lambda/4 stub Antenna

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