SMALL-SIZE QUICKLY RETUNABLE ANTENNA Russian patent published in 2017 - IPC H01Q9/00 

FIELD: radio engineering, communication.

SUBSTANCE: antenna contains the coaxial conductor section parts 8 and 9, separated by the reference section 10, the radiator 12 is connected to the end face central core 11 of the part 8, as a result the end face 11 cross-section is the antenna input. The part 9 is located near the conducting surface 13 at the distance of less than the quarter of the smallest wavelength range, the end face 14 of the part 9 external surface is closed on the conductive surface 13, as a result of which the outer surface of the part 9 in conjunction with the conductive surface 13 forms the shorted stub 15. The outer surface of the reference section 10 is the non-grounded terminal of the shorted stub 15, the closest to it local area 16 of the conductive surface 13 is the grounded terminal of the shorted stub 15. The gap 17 between the terminals 10 and 16 is the input of the shorted stub 15, as a result, the cross-section of the part 9 end face 14 is the antenna path input. The part 8 is made in the form of the vertical spiral, and the shorted stub 15 contains the contacts 18, providing the possibility to close it at the specified length. The vertical conductor 19 with contacts 20 along its length is connected to the non-grounded terminal 10 of the stub 15, providing the possibility to close the conductor 19 to different turns of the part 8 spiral.

EFFECT: reduction of the clearance limitations and increase of the operating frequency range overlapping coefficient by the radio transmitter capacity credit criterion, going to the antenna, reduction of the requirements for placing the antenna at the facility sites.

2 cl, 10 dwg