US 12,136,769 B2
Encapsulable antenna unit
Thomas Blödt, Steinen (DE)
Assigned to Endress+Hauser SE+Co. KG, Maulburg (DE)
Appl. No. 17/627,150
Filed by Endress+Hauser SE+Co. KG, Maulburg (DE)
PCT Filed Jun. 18, 2020, PCT No. PCT/EP2020/066985
§ 371(c)(1), (2) Date Jan. 14, 2022,
PCT Pub. No. WO2021/013443, PCT Pub. Date Jan. 28, 2021.
Claims priority of application No. 10 2019 119 615.9 (DE), filed on Jul. 19, 2019.
Prior Publication US 2022/0278467 A1, Sep. 1, 2022
Int. Cl. H01Q 21/28 (2006.01); H01Q 1/40 (2006.01); H01Q 5/335 (2015.01); H01Q 9/04 (2006.01); H01Q 9/42 (2006.01); H01Q 1/00 (2006.01)
CPC H01Q 21/28 (2013.01) [H01Q 1/40 (2013.01); H01Q 5/335 (2015.01); H01Q 9/04 (2013.01); H01Q 9/0407 (2013.01); H01Q 9/42 (2013.01); H01Q 1/002 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An antenna unit for transmitting and receiving high frequency signals having a defined frequency, comprising:
a substrate;
a signal gate via which the high frequency signals can be coupled in and out;
a first planar antenna connected to the signal gate and tuned to the frequency of the high frequency signals;
a second planar antenna connected to the signal gate and tuned to the frequency of the high frequency signals; and
a signal splitter arranged between the signal gate and the planar antennas and designed to supply the high frequency signals to the first planar antenna at a wavelength corresponding to a frequency of the high frequency signals at the dielectric value of the potting compound,
wherein the signal gate, the first planar antenna, and the second planar antenna are arranged on the substrate,
wherein the planar antennas are so designed that a real part of an impedance of the first planar antenna differs from a real part of an impedance of the second planar antenna by a defined factor corresponding to a square root of a dielectric value of a potting compound,
wherein the signal splitter is designed to supply the high frequency signals to the second planar antenna at a wavelength corresponding to a frequency of the high frequency signals at a dielectric value of air or vacuum, and
wherein the signal splitter includes:
a first signal path arranged between the signal gate and the first planar antenna and having a defined first path length corresponding to half the wavelength or to a whole numbered multiple of half the wavelength of the frequency of the high frequency signals at the dielectric value of the potting compound; and
a second signal path arranged in parallel with the first signal path between the signal gate and the second planar antenna and having a defined second path length corresponding to half the wavelength or to a whole numbered multiple of half the wavelength of the frequency of the high frequency signals at the dielectric value of air or vacuum.