Filtering antenna with low profile, wide band and high gain

Abstract

The invention discloses a filtering antenna with low profile, wide band and high gain. The antenna comprises an electromagnetic super-surface radiator and a feed part. The electromagnetic super-surface is constituted by non-uniformly small electrical units and is used as a high-efficiency radiator so that the bandwidth and gain of antenna are increased. At the same time, radiation zero points can be produced, and frequency selectivity can be increased through adjusting roll-off degree of an upper edge of a pass-band. According to the antenna, discrete micro-strip coupling slits are creatively used for feeding; metal via holes are introduced in between the micro-strip and floor; good filtering effect of low frequency stop band is guaranteed; roll-off degree of pass-band lower edges is increased. According to the invention, electromagnetic super-surface with filtering effect is creatively designed and is applied in filtering antenna; the antenna structure is simple and no complicated filtering circuit is used; The height is only 0.06[lambda]0; 10dB impedance bandwidth is 28.4%; antenna loss is low and efficiency reaches up to 95%; in-band average gain is 8.2dBi; out-band rejection is over 20dB; the stop-band is wide.

Description

technical field [0001] The invention relates to an antenna in the field of wireless mobile communication, in particular to a low-profile, wide-band, high-gain filter antenna applicable to radio frequency terminals such as mobile communication base stations. Background technique [0002] In wireless communication systems, multifunctional circuit modules have attracted widespread attention due to their small size and good overall performance. Antennas and filters are two integral components of an RF front end. Usually, the antenna and filter are designed independently as two components, and then they are respectively matched to 50Ω standard ports, and then the two are cascaded. In this way, the size of the entire module increases, which is unfavorable for a radio frequency front-end with limited space. And because the bandwidths of the filter and the antenna are often not exactly the same, the filtering effect is affected. Moreover, the loss of the filter is unavoidable, wh...

AI Technical Summary

Problems solved by technology

Although the collaborative design of the filter and the antenna improves the module performance to a certain extent, the gain of the antenna is relatively low due to the unavoidable loss of the filter

Especially for broadband designs, multi-stage resonators are required, often resulting in more severe losses

[0004] At this stage, there are few antenna designs that can have a good filtering effect without using complex filtering circuits

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