US 12,259,459 B2
Half-wave back-folding directional microwave detection antenna
Gaodi Zou, Shenzhen (CN); and Xin Zou, Shenzhen (CN)
Assigned to Shenzhen Merrytek Technology Co., Ltd., Shenzhen (CN)
Filed by Shenzhen Merrytek Technology Co., Ltd., Shenzhen (CN)
Filed on Dec. 8, 2021, as Appl. No. 17/545,984.
Claims priority of application No. 202110458958.5 (CN), filed on Apr. 27, 2021; application No. 202121726634.7 (CN), filed on Jul. 28, 2021; and application No. 202121726640.2 (CN), filed on Jul. 28, 2021.
Prior Publication US 2022/0342065 A1, Oct. 27, 2022
Int. Cl. G01S 13/56 (2006.01); H01Q 9/42 (2006.01)
CPC G01S 13/56 (2013.01) [H01Q 9/42 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A half-wave back-folding directional microwave detection antenna for microwave detection, comprising:
a reference ground; and
a half-wave oscillator which has an electrical length greater than or equal to ½ wavelength and less than or equal to ¾ wavelength, wherein said half-wave oscillator is folded back to form a feed point at a position of said half-wave oscillator that a distance between a first end and a second end of said half-wave oscillator is greater than or equal to λ/128 and is lesser than or equal to λ/6, wherein said first end of said half-wave oscillator is defined as a far end of said half-wave oscillator and said second end of said half-wave oscillator close to said feed point thereof is defined as a feed end of said half-wave oscillator, wherein said feed point is offset from said far end of said half-wave oscillator and is close to said feed end of said half-wave oscillator, wherein said far end and said feed end of said half-wave oscillator are spaced apart from said reference ground with a distance greater than or equal to λ/128, and a distance between at least one of said far end and said feed end of said half-wave oscillator and said reference ground is lesser than or equal to λ/6, wherein a distance between said feed end of said half-wave oscillator and said reference ground is lesser than or equal to a distance between said far end of said half-wave oscillator and said reference ground, such that when said half-wave oscillator is fed for receiving an excitation signal at said feed point, said far end and said feed end of said half-wave oscillator form a phase difference and are coupled to each other, wherein λ is wavelength parameter corresponding to frequency of the excitation signal.