NDLI: Quad-band filtering antenna based on slotted half-mode substrate-integrated waveguide cavity

Content Provider	IET Digital Library
Author	Niu, Bing Jian Cao, Yan Jie
Abstract	A quad-band filtering antenna based on a slotted half-mode substrate-integrated waveguide cavity is proposed. Three cavity edges are shorted by metallic posts and one edge is opened. Then three rectangular slots are etched to obtain multi-band operations and coaxial feeding is employed. Four radiation frequencies with similar field distributions but different resonating size can effectively radiate cavity energy through the opened edge and etched slots, resulting in good in-band antenna features. On the other hand, three radiation nulls whose dominant field is concentrated around the feeding port can generate little energy leakage, leading to good out-of-band filtering characteristics. The proposed design has been fabricated with an overall size of 0.40λ0 × 0.20λ0. Measured radiation frequencies are at 3.35, 3.88, 4.54, and 5.18 GHz with high gain of about 5.0 dBi and efficiency of 70.0%, whereas measured radiation nulls are at 3.54, 4.24, and 4.91 GHz with very low gain of −16.75, −13.46, and −12.06 dBi and efficiencies of 0.59, 0.88, and 1.42%. Moreover, unidirectional patterns with stable radiation are experimentally confirmed.
Starting Page	909
Ending Page	911
Page Count	3
ISSN	00135194
Volume Number	56
e-ISSN	1350911X
Issue Number	Issue 18, Sep (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/56/18
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2020.1437
Journal	Electronics Letters
Publisher Date	2020-07-07
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Antenna Accessory Antenna Feeds Antenna Radiation Pattern Cavity Edges Cavity Energy Coaxial Feeding Directive Antenna Efficiency 0.59 Percent Efficiency 0.88 Percent Efficiency 1.42 Percent Efficiency 70 Percent Frequency 3.35 GHz to 5.18 GHz In-band Antenna Measured Radiation Frequency Measured Radiation Nulls Metallic Posts Microwave Antenna Multiband Operation Multifrequency Antenna Out-of-band Filtering Characteristic Quad-band Filtering Antenna Radiation Frequency Rectangular Slot Single Antenna Slot Antenna Slotted Half-mode Substrate-integrated Waveguide Cavity Substrate Integrated Waveguide Unidirectional Pattern Waveguide Antenna
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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