Broadband microwave slot antennas, and antenna arrays including same
First Claim
1. A broadband microwave antenna exhibiting high radiation efficiency over a broad frequency band in which the VSWR is less than 2.5:
- 1 over at least 15% of the frequency band, comprising;
a dielectric substrate having two sides;
an electrically conductive layer serving as a ground plane on at least one side of the dielectric substrate;
a feed line in the form of a feed strip of electrically conductive material at the other side of the dielectric substrate;
said ground plane being formed with at least one radiating slot having a feed end at one side of the slot, and a load end at the opposite side of the slot, said feed end being electromagnetically coupled to said feed strip for feeding thereto the energy to be radiated or received;
said feed strip being of uniform width for substantially its complete length, but including a change in width at the feed end of the slot to produce a first impedance matching network at the feed end of the slot effective to bring the slot impedance to the level of the feed line over said broad frequency band;
said feed strip including another change in width at the load end of the slot to produce a second impedance matching network which reduces the slot reactance to match the reactive impedance of the load to the reactive part of the slot impedance over said broad frequency band.
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Abstract
A broadband microwave antenna exhibiting high radiation efficiency over a broad frequency band in which the VSWR is less than 2.5:1 over at least 15% of the frequency band, includes a ground plane at one side of a dielectric substrate and formed with at least one slot, and a feed strip at the other side of the substrate. The feed strip is of uniform width for substantially its complete length, but includes a change in width at the feed end of the slot to produce a first impedance matching network effective to bring the slot impedance to the level of the feed line over the broad frequency band, and another change in width at the load end of the slot to produce a second impedance matching network which reduces the slot reactance to match the reactive impedance of the load to the reactive part of the slot impedance over the broad frequency band.
48 Citations
17 Claims
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1. A broadband microwave antenna exhibiting high radiation efficiency over a broad frequency band in which the VSWR is less than 2.5:
- 1 over at least 15% of the frequency band, comprising;
a dielectric substrate having two sides; an electrically conductive layer serving as a ground plane on at least one side of the dielectric substrate; a feed line in the form of a feed strip of electrically conductive material at the other side of the dielectric substrate; said ground plane being formed with at least one radiating slot having a feed end at one side of the slot, and a load end at the opposite side of the slot, said feed end being electromagnetically coupled to said feed strip for feeding thereto the energy to be radiated or received; said feed strip being of uniform width for substantially its complete length, but including a change in width at the feed end of the slot to produce a first impedance matching network at the feed end of the slot effective to bring the slot impedance to the level of the feed line over said broad frequency band; said feed strip including another change in width at the load end of the slot to produce a second impedance matching network which reduces the slot reactance to match the reactive impedance of the load to the reactive part of the slot impedance over said broad frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- 1 over at least 15% of the frequency band, comprising;
Specification