Design of a Low-Noise 2.4/5.5 GHz Dual-Band LNA Based on Microstrip Structure
Mingwen Zhang, Zhiqun Cheng, Tingwei Gong, Bangjie Zheng, Zhiwei Zhang
TL;DR
The paper introduces a compact dual-band low-noise amplifier operating at 2.4 and 5.5 GHz with excellent noise performance and wide bandwidth.
Contribution
A novel dual-band LNA design using a microstrip structure with improved noise figures and compact size is proposed.
Findings
The amplifier achieves noise figures of 1.0 dB and 1.1 dB at 2.4 GHz and 5.5 GHz, respectively.
The design offers gains of 15.6 dB and 12.3 dB at the two operating frequencies.
The LNA has a compact footprint of 75 × 43 mm² with bandwidths exceeding 200 MHz.
Abstract
This paper presents a 2.4/5.5 GHz single-stage dual-band low-noise amplifier (DB-LNA) based on a microstrip structure. The design utilizes a purely microstrip dual-band bias circuit (DBBC), composed of series microstrip lines and radial stubs. The broadband characteristics of the radial stubs enable wide frequency coverage and good frequency selectivity. A simple series-shunt microstrip matching network is adopted to maintain a compact overall design structure. The proposed DB-LNA is fabricated using a standard printed circuit board (PCB) process. Measurement results show that the amplifier achieves gains of 15.6 dB and 12.3 dB, input return losses of 14.6 dB and 14.5 dB, and output return losses of 23.2 dB and 14.1 dB at 2.4 GHz and 5.5 GHz, respectively. The measured noise figures (NF) are 1.0 dB and 1.1 dB at the corresponding frequencies, with −3 dB bandwidths exceeding 200 MHz.…
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Taxonomy
TopicsRadio Frequency Integrated Circuit Design · Microwave Engineering and Waveguides · Antenna Design and Analysis