Electrically-small third-order filter antenna with good out-of-band rejection characteristic

An out-of-band suppression and filter technology, applied in the direction of antenna grounding switch structure connection, radiation element structure, etc., can solve problems such as loss, system performance reduction, and system matching failure, and achieve the expansion of passband bandwidth, increase of order, Effect of Improving Out-of-Band Suppression Characteristics

Active Publication Date: 2016-08-10
重庆明东新科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In a traditional wireless communication system, the filter and the antenna are two independent devices, each of which performs different functions, and is connected by a 50Ω transmission line (impedance converter), but this 50Ω transmission line is in our It cannot be perfectly matched to the overall system in the desired frequency range, it introduces some losses and degrades the performance of the overall system

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  • Electrically-small third-order filter antenna with good out-of-band rejection characteristic
  • Electrically-small third-order filter antenna with good out-of-band rejection characteristic
  • Electrically-small third-order filter antenna with good out-of-band rejection characteristic

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Embodiment Construction

[0025] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] figure 1 It is the overall structural diagram of the dual passband filter of the present invention, as shown in the figure, the filter includes a cuboid dielectric substrate 1; an outer opening ring resonator part 2; an inner opening ring resonator part 3; two coupling lines 4; a monopole antenna 5 including two parts of an inverted L shape and a fan shape; a feeder part 6 . The thickness of the cuboid dielectric substrate is denoted as H, and the material Rogers4350B is used. The dielectric constant is 3.48, the relative magnetic permeability is 1.0, and the loss tangent is 0.0037. The thickness of the resonator part, the antenna part, the coupled line part and the feed line part are all the same. figure 2 It is the front view of the electrically small third-order filter with out-of-band suppression characteristic described in th...

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Abstract

The invention discloses an electrically-small third-order filter antenna with a good out-of-band rejection characteristic. The electrically-small third-order filter antenna belong to the field of filter and antenna cross technologies, and comprises a feeder portion, a resonator portion, a coupling line portion, a radiating patch portion, a dielectric substrate and a grounding plate. The electrically-small third-order filter antenna is based on two open-loop resonators with openings facing each other, and replaces a last resonator with a zigzag antenna comprising a sector, so that the antenna has energy radiation and resonance functions, thereby reducing integral size of a filter and the antenna, and making transmission loss between the filter and the antenna close to zero. Accordingly, the antenna serving as the last-order resonator has a function of out-of-band rejection. Further, a resonator is parallelly connected in the interior of a first resonator, so that bandwidth of the filter antenna is significantly increased while maintaining the original size unchanged. The electrically-small third-order filter antenna further has the advantages of compact structure, small electrical size and easy processing.

Description

technical field [0001] The invention belongs to the technical field of filters and antennas intersecting, and relates to an electrically small third-order filter antenna with good out-of-band suppression characteristics. Background technique [0002] In a traditional wireless communication system, the filter and the antenna are two independent devices, each of which performs different functions, and is connected by a 50Ω transmission line (impedance converter), but this 50Ω transmission line is in our The desired frequency range cannot be perfectly matched to the overall system, it introduces some losses and degrades the overall system performance. With the rapid development of communication technology, the current communication platform is becoming increasingly compact, which puts forward higher requirements for the miniaturization and low cost of the antenna of the radio frequency front end. Therefore, the design of simple and compact antennas with filtering performance h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/38H01Q1/50
CPCH01Q1/38H01Q1/50
Inventor 唐明春陈英王浩石婷
Owner 重庆明东新科技有限公司
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