Antenna Flower Pot High Gain

Theoretically this should provide an antenna gain of 3dbd at 2m.

Antenna flower pot high gain. However note that the handbook indicates that in practice the gain sleeve antenna would realise about 2 5dbd. Experimental dual band high gain flower pot antenna. Higher gain is achieved by adding an additional half wave element at the fundamental frequency 2m coupled by a half wave phasing line to drive both half waves in phase.

The effective radiating element length of the single 5 8 flower pot is 7 8λ suggesting it would have somewhat less than 2 5dbd gain. Higher gain is achieved by adding an additional half wave element at the fundamental frequency 2m coupled by a half wave phasing line to drive both half waves in phase. This experimental version is an extension of the basic half wave flower pot antenna.

Dual band high gain flower pot antenna. The antenna is dual banded to operate on 70cm using the same sleeve technique as used on the dual band basic flower pot. Dimensions shown are for a 1st build prototype from a concept drawing and have yet to be refined.

This experimental version is an extension of the basic half wave flower pot antenna. To construct the antenna first select a suitable length of grey 25mm conduit as a minimum 1m but if you make it longer you will have more room below the coil to attach to your antenna support. This results in the antenna operating with four half waves in phase on 70cm and provides a theoretical antenna gain of 6dbd on 70.

Theoretically this should provide an antenna gain of 3dbd at 2m. The diagram below shows the basic arrangement of the 2m half wave version of the antenna. Anyway the credit here must go to vk2zoi.

Experimental dbhgfp antenna a challenge laid down by m7mnp thanks mav.