A four-element mimo antenna with small size and wide bandwidth based on printed circuit board

Abstract

A small-size and wide-bandwidth four-unit MIMO antenna based on a printed circuit board comprises a substrate, four two-arm common ground type dipole units, four tooth-shaped ground bracket structures and four microstrip type feeder lines. A microstrip circuit is used for feeding, and ground tooth-shaped branch knots are introduced, so that matching of antenna radiating units and cross coupling between radiating units are improved. Fifty-one percent of bandwidth coverage (2.30 GHz - 3.80 GHz) is achieved, cross coupling between the radiating units in a full band is smaller than -10 dB, by the aid of the reflection effect of the tooth-shaped branch knots, the radiation directional patterns of the antenna radiating units have directional operating characteristics, the relevancy of the directional patterns of the radiating units is effectively reduced, and the space diversity gain of the antenna is improved. The small-size and wide-bandwidth four-unit MIMO antenna based on the printed circuit board is small in size, wide in bandwidth, low in cost on the basis of a traditional printed circuit board process, and capable of being well applied to small-sized broadband wireless communication equipment using an MIMO technology.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a small-sized and wide-bandwidth four-element MIMO antenna based on a printed circuit board. Background technique [0002] In recent years, wireless access technology has achieved rapid development, and abundant network resources have put forward new requirements for the bandwidth of wireless access technology. Due to the limitations of spectrum planning and the widespread existence of rich multipath access environments, how to increase channel capacity under the existing frequency resources and time resources has become a research hotspot. In this context, MIMO technology emerges as the times require. It proposes the concept of using airspace resources based on the existing frequency domain and time domain resources. Using multiple transmitting and receiving antennas at the transmitting and receiving end, in space, especially rich In a multipath environment, multiple effective...

AI Technical Summary

Problems solved by technology

Traditional decoupling methods, such as the use of decoupling networks, or the introduction of choke branches and choke slots, are often processed for point frequencies, which are difficult to apply under wide bandwidth

However, if a unit with an orthogonal mode is used as the radiation unit of the antenna, such as a combination of a slot antenna and a monopole antenna, although ideal mutual coupling characteristics can be obtained, the radiation characteristics of the antenna will be inconsistent, and the pattern and gain characteristics will be inconsistent. not ideal

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