Four-mode filtering antenna with double zero points based on substrate integrated waveguide

Abstract

The invention discloses a four-mode filtering antenna with double zero points based on substrate integrated waveguide, and belongs to the technical field of filtering antennas. The four-mode filteringantenna is composed of an upper layer metal surface, a first dielectric substrate, two middle metal wafers, a second dielectric substrate and a lower layer metal bottom face and comprises a first rectangular double-mode substrate integrated waveguide resonant cavity and a second rectangular double-mode substrate integrated waveguide resonant cavity. The second rectangular double-mode substrate integrated waveguide resonant cavity is internally provided with a transverse groove serving as a gap radiation antenna. The first rectangular double-mode substrate integrated waveguide resonant cavityand the second rectangular double-mode substrate integrated waveguide resonant cavity are cascaded together in a direct coupled mode to form the four-mode filtering antenna with the double zero pointsbased on substrate integrated waveguide. The four-mode filtering antenna with the double zero points based on substrate integrated waveguide adopts a coplanar waveguide feed mode, and impedance matching is conducted in a step mode.

Description

technical field [0001] The invention belongs to the technical field of filter antennas, in particular to a four-mode filter antenna with double zeros based on a substrate integrated waveguide, which is suitable for improving the selectivity and out-of-band suppression of the filter antenna, realizing the miniaturization of the entire filter antenna and realizing Integration of filtering performance and antenna radiation performance. Background technique [0002] The rapid development of modern communication modules has put forward strict requirements for each module of the wireless communication system. The multi-function module is regarded as one of the important solutions of the wireless communication system because of its advantages of greatly reducing the circuit size and improving the system performance. ; The filter antenna is a device that integrates the functions of a band-pass filter and an antenna. One design method of the filter antenna is to connect the designed ...

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Problems solved by technology

[0004] Peng Kai Li and others disclosed a substrate-based integrated waveguide technology with a Single-layer slot filter antenna with adjustable zero point on one side. The single-layer slot filter antenna with adjustable zero point on one side consists of a single-layer rectangular SIW cavity, four metallized via holes, a transverse slot and a vertical SMA connector. The controllability of an out-of-band zero point can be realized by controlling the position of the transverse groove, thereby improving the selectivity of the entire filter antenna; but the disadvantage is that only one radiation zero point is realized outside the band, so that the non-zero point side of the passband Insufficient selectivity, and the bandwidth of the entire filter antenna is relatively narrow

[0005] "A Third-Order SIW-Integrated Filter / Antenna Using TwoResonant Cavities" published by Ricardo Lovato et al. in IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, VOL.17.2018 introduced a third-order filter antenna based on substrate integrated waveguide technology. The third-order filter antenna based on substrate integrated waveguide technology is composed of two SIW rectangular resonant cavities, and a slot antenna is designed in the second cavity. The slot antenna excites two modes in the slot cavity, realizing a three-dimensional First-order filter response, while retaining the filtering and radiation characteristics, a radiation zero point is formed outside the band of the filter antenna, which increases the selectivity to a certain extent; but the disadvantage is that only a radiation zero point is realized outside the band, making the passband The selectivity of the zero-free side is insufficient, and the size of the filter in this paper is relatively large

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