Multilayer pillbox type parallel-plate waveguide antenna and corresponding antenna system

Patent metadata

Field	Value
Publication number	US-9246232-B2
Application number	US-201013262765-A
Country	US
Kind code	B2
Filing date	Mar 29, 2010
Priority date	Apr 2, 2009
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

A multilayer antenna is provided, which includes a power supply portion generating a wave, a radiating portion, and a guide portion that makes it possible to guide the wave from the power supply portion to the radiating portion. The guide portion includes: at least two stacked guide layers having parallel planes and, for each pair of adjacent layers, a transition between the adjacent layers, including a reflector engaging with a slot-coupling. For at least one pair of adjacent layers, for which the guide portion includes a non-planar reflector, the slot-coupling includes a plurality of slots. Each slot includes a main body that is elongate along at least one axis. The slots are placed on at least one row and together form a pattern that extends along the reflector and has a shape that is dependent on the shape of the reflector.

First claim

The invention claimed is:

1. A multilayer antenna comprising:
a feeding part generating a wave;
a radiating part;
a guiding part enabling said wave to be guided from the feeding part to the radiating part, said guiding part comprising:
at least two parallel-plate guide type superimposed layers, and
for each pair of adjacent layers, a transition between said adjacent layers, comprising a reflector cooperating with a coupling by slots,
wherein, for at least one pair of adjacent layers for which the guiding part comprises a reflector of a non-plane shape, the coupling by slots comprises a plurality of slots, each slot comprising a main body having a shape elongated along at least one axis, said plurality of slots being laid out in at least one row and together forming a pattern that extends along the reflector and has a shape that is a function of the shape of the reflector, said plurality of slots being configured to reduce or eliminate undesirable effects of resonance encountered in a continuous single slot, thus optimizing a transfer of power of said wave between said at least one pair of adjacent layers.

2. The antenna according to claim 1 , wherein each slot has a main body having a shape elongated along at least one axis substantially parallel or perpendicular to the reflector.

3. The antenna according to claim 1 , wherein at least certain ones of the slots have a main body possessing a shape elongated along only one axis.

4. The antenna according to claim 1 , wherein at least certain ones of the slots comprise a main body possessing a cross shape, said main body comprising a first arm having a shape elongated along a first axis and a second arm having a shape elongated along a second axis substantially perpendicular to the first axis.

5. The antenna according to claim 1 , wherein the shape of the pattern formed together by said plurality of slots is substantially identical to that of the reflector.

6. The antenna according to claim 1 , wherein each slot of said plurality of slots has:
a length (l si ) ranging from 0.25*λ d to 0.5*λ d ; and
a width (w si ) ranging from 0.1*λ d to 0.2*λ d ,

with λ d being the wavelength in the parallel-plate guide type superimposed layers, at the operating frequency of the antenna.

7. The antenna according to claim 1 , wherein each slot of said plurality of slots is at a distance, relative to the reflector, ranging from 0.3*λ d to 0.5*λ d , with λ d being the wavelength in the parallel-plate guide type superimposed layers, at the operating frequency of the antenna.

8. The antenna according to claim 1 , wherein the distance between two adjacent slots of said plurality of slots ranges from 0.02*λ d to 0.1*λ d , with λ d being the wavelength in the parallel-plate guide type superimposed layers at the working frequency of the antenna.

9. The antenna according to claim 1 , wherein said feeding part comprises at least two sources that are mutually interlaced, physically or electrically.

10. An antenna system comprising:
a multilayer antenna, comprising:
a first feeding part generating a first wave;
a radiating part;
a guiding part enabling said first wave to be guided from the first feeding part to the radiating part, said guiding part including at least two parallel-plate guide type superimposed layers and, for each pair of adjacent layers, a first transition between said adjacent layers, comprising a first reflector cooperating with a first coupling by slots;
a second feeding part generating a second wave, wherein said guiding part also enables said second wave to be guided from the second feeding part up to the radiating part, said guiding part moreover comprising, for each pair of adjacent layers, a second transition between said adjacent parts comprising a second reflector cooperating with a second coupling by slots, said second transition being offset by 90° relative to said first transition,
for at least one pair of adjacent layers for which the guiding part comprises a reflector of a non-plane shape, the first coupling by slots comprises a plurality of first slots, each first slot possessing a shape elongated along at least one axis, said plurality of first slots being positioned on at least one row and together forming a pattern that extends along the first reflector and has a shape that is a function of the shape of the first reflector, said plurality of first slots being configured to reduce or eliminate undesirable effects of resonance encountered in a continuous single slot, thus optimizing a transfer of power of said first wave between said at least one pair of adjacent layers,
for at least one pair of adjacent layers for which the guiding part comprises a reflector of a non-plane shape, the second coupling by slots comprises a plurality of second slots, each second slot possessing a shape elongated along at least one axis, said plurality of second slots being positioned on at least one row and together forming a pattern that extends along the second reflector and has a shape that is a function of the shape of the second reflector, said plurality of second slots being configured to reduce or eliminate undesirable effects of resonance encountered in a continuous single slot, thus optimizing a transfer of power of said second wave between said at least one pair of adjacent layers.

Assignees

• Sauleau Ronan
• Ettorre Mauro
• Univ Rennes
• Centre Nat Rech Scient

Inventors

• Sauleau Ronan
• Ettorre Mauro

Classifications

• H01Q21/064

  using horn or slot aerials (slotted waveguides arrays H01Q21/005) · CPC title

• H01Q3/18

  wherein the primary active element is movable and the reflecting device is fixed · CPC title

• H01Q19/17

  the primary radiating source comprising two or more radiating elements (H01Q19/15, H01Q25/00 take precedence) · CPC title

• H01Q19/138 Primary

  Parallel-plate feeds, e.g. pill-box, cheese aerials · CPC title

• H01Q21/005

  Slotted waveguides arrays · CPC title