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ANTENTOP- 01- 2005, # 007

Window Dipole Antennas with Capacitive Loads

 

Feeding of 10-meters Band Window Dipole Antennas with Capacitive Loads

 

Since 10- meters band window dipole antenna with capacitive loads has low input impedance a matching device must be installed between the antenna and feeding coaxial cable.

MMANA allows to simulate such matching device. Figure 14 shows schematic of that matching device as well as data for different antennas. Of course, it needs adjust a little the L and C to particular antenna.

 

 

Figure 14 Matching device for antenna with capacitive loads

 

SWR of 10 meters Band Window Dipole Antennas with Capacitive Loads

 

Figure 15 shows a SWR at 50- Ohm coaxial connected through a matching device (see Figure 14) to antenna shown at Figure 11. SWR was simulated by MMANA.

 

The antenna has theoretical pass band 375 kHz at SWR 1,5:1 at 50- Ohm coaxial cable, and pass band 750 kHz at SWR 2:1 at 50- Ohm coaxial cable. It is not enough for working at all 10- meters band. However, due the losses at neighbor subjects the pass band of the antenna is wider the theoretical one.

 

 

 

 

Figure 15 SWR at 50- Ohm coaxial connected through a matching device (see Figure 14) to antenna shown at Figure 11

 

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