NDLI: Wideband balun bandpass filter explored for a balanced dipole antenna with high selectivity

Content Provider	IET Digital Library
Author	Zhang, Gang Wang, Jianpeng Wu, Wen
Abstract	A novel microstrip wideband balun bandpass filter (BPF) is presented for development of a balanced dipole antenna with wide operating band and high frequency selectivity. By utilising the standing-wave property of current distribution along a half-wavelength (λ/2) open-ended microstrip line, out-of-phase signals are ideally obtained at two output ports of a balun. Meanwhile, proper coupling topologies between the open-circuited λ/2 microstrip transmission line and the quadruple-mode resonators are selected to achieve a balun BPF with both characteristics of balanced performance and wideband filtering properties. A balun BPF operating at 1.65 GHz with 32% fractional bandwidth is at first designed. The derived results not only exhibit good performance with 0.49 dB amplitude imbalance and 7.2° phase imbalance, but also achieve high selectivity relying on two transmission zeros. Next, this balun BPF is integrated with a balanced dipole antenna with a flat shape towards wideband and high-selective radiation. Both simulated and measured results achieve higher than 10 dB return loss and 2.4 dBi radiation gain over a band of 1.4–1.9 GHz.
Starting Page	1153
Ending Page	1155
Page Count	3
ISSN	00135194
Volume Number	52
e-ISSN	1350911X
Issue Number	Issue 13, Jun (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/52/13
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2016.0716
Journal	Electronics Letters
Publisher Date	2016-06-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Amplitude Imbalance Balanced Dipole Antenna Baluns Band-pass Filter Bandwidth 1.4 GHz to 1.9 GHz BPF Coupling Topology Current Distribution Dipole Antenna Filter And Other Network Fractional Bandwidth Frequency Selectivity Half-wavelength Open-ended Microstrip Line High-selective Radiation Microstrip Filter Microstrip Line Microstrip Wideband Balun Bandpass Filter Open-circuited Microstrip Transmission Line Out-of-phase Signal Phase Imbalance Poles And Zeros Quadruple-mode Resonator Single Antenna Standing-wave Property Transmission Line Transmission Zero UHF Antenna UHF Resonator Waveguide And Microwave Transmission Line Waveguide And Microwave Transmission Line Component Wideband Filtering Wideband Radiation
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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