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A Miniaturized Quad-Stopband Frequency Selective Surface with Convoluted and Interdigitated Stripe Based on

Jian Dong1, Yan Ma1, Zhuangzhuang Li1

  • 1School of Computer Science and Engineering, Central South University, Changsha 410075, China.

Micromachines
|September 28, 2021
PubMed

Keywords:
angle and polarization stabilityfrequency selective surfaceminiaturizationquad-stopband

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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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