Antenna structure

Abstract

An antenna structure includes: a grounding element, a feed radiator, a main radiator, a short-circuit radiator, a parasitic radiator, and a dielectric substrate. The feed radiator has a feed point. The main radiator is coupled to the feed radiator. The main radiator can also be coupled to the grounding element via the short-circuit radiator. The parasitic radiator is coupled to the grounding element, wherein the parasitic radiator is adjacent to the main radiator. The feed radiator, main radiator, short-circuit radiator, and parasitic radiator can all be disposed on the dielectric substrate.

Claims

1. An antenna structure, comprising: A grounding element; A feed radiator having a feed point; a main radiator coupled to the feed radiator; A short-circuit radiating section, wherein the main radiating section is further coupled to the grounding element via the short-circuit radiating section; a parasitic radiating section, coupled to the grounding element, wherein the parasitic radiating section is adjacent to the main radiating section; and a dielectric substrate, wherein the feed radiating section, the main radiating section, the short-circuit radiating section, and the parasitic radiating section are all disposed on the dielectric substrate; wherein the antenna structure covers a first frequency band and a second frequency band; wherein the outer perimeter of the parasitic radiating section is between 0.25 times and 0.4 times the wavelength of the second frequency band.

2. The antenna structure as described in claim 1, wherein the feed radiating section further has a corner notch.

3. The antenna structure as described in claim 1, wherein the main radiating part presents a larger L-shape, and the short-circuit radiating part presents a smaller L-shape.

4. The antenna structure as described in claim 1, wherein the parasitic radiating part is at least partially surrounded by the main radiating part and the short-circuit radiating part.

5. The antenna structure as claimed in claim 1, wherein the parasitic radiating portion includes a connecting section and a rectangular widening section, and the rectangular widening section is coupled to the grounding element via the connecting section.

6. The antenna structure as described in claim 5, wherein a coupling gap is formed between the main radiating portion and the rectangular widening section, and the width of the coupling gap is between 0.5 mm and 1.5 mm.

7. The antenna structure as claimed in claim 1, wherein the first frequency band is between 2400MHz and 2500MHz, and the second frequency band is between 5150MHz and 7125MHz.

8. The antenna structure as described in claim 7, wherein the length of the feed radiating section is between 0.2 and 0.3 times the wavelength of the second frequency band.

9. The antenna structure as described in claim 7, wherein the total length of the main radiating part and the short-circuit radiating part is approximately equal to 0.5 times the wavelength of the first frequency band.

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