A Planar Filter Yagi Antenna Using Absorbing Stubs

Abstract

The invention discloses a planar filter Yagi antenna using absorbing branches, which includes a dielectric substrate, a feeder line applied on both sides of the dielectric substrate, impedance matching lines, absorbing branches, a floor and a pair of dipole arms; the feeder line, impedance matching line and one of them The dipole arm is distributed on the upper layer of the dielectric substrate, and the impedance matching line and the dipole arm are connected to the feeder line in parallel; the floor and another dipole arm are located on the lower layer of the dielectric substrate; the absorption branch is connected in series with the impedance matching line , which consists of a band-stop filter and an absorption resistor, the band-stop filter is located on the upper layer of the dielectric substrate, and the absorption resistor is connected between the dielectric substrate and the floor. The present invention adopts the planar filtering Yagi antenna using absorbing stubs for the first time, the relative impedance bandwidth is 19.3%, and has good filtering characteristics.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to the field of filter antennas, in particular to a planar filter Yagi antenna using absorption branches. Background technique [0002] Miniaturization, integration and modularization are the main development trends of today's wireless communication systems. The filter antenna that integrates two important components of the filter and the antenna can effectively reduce the overall size of the system, improve its integration, and constitute the antenna filter module (AFU) in the RF front-end, so it is of great significance to the application and development of the communication system . [0003] However, the traditional design methods of filter antennas face the dilemma of large size and constraints of antenna structure. For example: ChengW [1] The filter antenna proposed in et al. only cascaded the filter and antenna. This method failed to consider the specific characteristics o...

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Problems solved by technology

[0003] However, the traditional design method of the filter antenna faces the dilemma of large size and constraints of the antenna structure.

For example: ChengW [1] The filter antenna proposed in et al. just cascaded the filter and the antenna. This method fails to consider the specific characteristics of the filter and the antenna, which is easy to cause impedance mismatch and increase insertion loss, and the size does not change much.

Another example: Hu H T [2] proposed to use the antenna as the last resonator of the filter, which is also not conducive to the miniaturization of integrated components

Loading parasitic structures on the antenna is also a way to design filter antennas, such as: Jin J Y [3] Good filtering characteristics can be achieved by slotting on the patch antenna, and it is also beneficial to reduce the size of the front-end device, but this method is too limited by the specific structure of the antenna, and there is no definite way for different antennas Realize filtering

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