NDLI: Vertically-integrated differential filtering patch antenna excited by a balun bandpass filter

Content Provider	IET Digital Library
Author	Jin, Huayan Luo, Guo Qing Che, Wenquan Chin, Kuo Sheng Pan, Yujian Yu, Yufeng
Abstract	This study develops a differential-fed filtering patch antenna, which features superior frequency selectivity, compact size, low cross-polarisation, and symmetrical radiation patterns. The proposed antenna consists of a rectangular patch on the top layer, which is differentially fed by a balun bandpass filter on the bottom layer. A pair of rectangular coupling slots were etched on the middle layer for energy coupling. The patch antenna performs not only as the radiator but also as the last resonator of the whole filter circuit for compactness. A prototype of the proposed filtering antenna operating at 2.45 GHz was fabricated and tested. The measured in-band peak gain is 5.9 dBi with steep roll-off at band edges, and the out-of-band gain is less than − 25 dBi. Moreover, symmetrical radiation patterns and low cross-polarisation levels of − 22 dB are also realised for the proposed filtering antenna.
Starting Page	300
Ending Page	304
Page Count	5
ISSN	17518725
Volume Number	13
e-ISSN	17518733
Issue Number	Issue 3, Feb (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/13/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2018.5522
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2019-01-09
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Antenna Radiation Pattern Balun Bandpass Filter Baluns Band-pass Filter Broadband Antenna Cross-polarisation Levels Differential Filtering Patch Antenna Energy Coupling Filter And Other Network Filter Circuit Filtering Method in Signal Processing Frequency 2.45 GHz Microstrip Antenna Noise Figure 22.0 DB Rectangular Coupling Slot Rectangular Patch Single Antenna Superior Frequency Selectivity Symmetrical Radiation Pattern UHF Antenna
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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