Dual-Frequency and Dual-Mode Circular Patch Antennas Based on Epsilon-Negative Transmission Line

2013 ◽  
Vol 55 (10) ◽  
pp. 2393-2398 ◽  
Author(s):  
Quanwen Hou ◽  
Hangfei Tang ◽  
Yahong Liu ◽  
Xiaopeng Zhao
Keyword(s):  
Transmission Line ◽  
Patch Antennas ◽  
Dual Frequency ◽  
Dual Mode ◽  
Circular Patch

scholarly journals New Compact Wearable Metamaterials Circular Patch Antennas for IoT, Medical and 5G Applications

2020 ◽  
Vol 3 (4) ◽  
pp. 42
Author(s):  
Albert Sabban
Keyword(s):  
Communication Systems ◽  
Dynamic Range ◽  
Low Cost ◽  
Patch Antennas ◽  
Antenna Feed ◽  
Circular Patch ◽  
Wearable Antenna ◽  
Wearable Antennas ◽  
Feed Network ◽  
Line Design

The development of compact passive and active wearable circular patch metamaterials antennas for communication, Internet of Things (IoT) and biomedical systems is presented in this paper. Development of compact efficient low-cost wearable antennas are one of the most significant challenges in development of wearable communication, IoT and medical systems. Moreover, the advantage of an integrated compact low-cost feed network is attained by integrating the antenna feed network with the antennas on the same printed board. The efficiency of communication systems may be increased by using efficient passive and active antennas. The system dynamic range may be improved by connecting amplifiers to the printed antenna feed line. Design, design considerations, computed and measured results of wearable circular patch meta-materials antennas with high efficiency for 5G, IoT and biomedical applications are presented in this paper. The circular patch antennas electrical parameters on the human body were analyzed by using commercial full-wave software. The circular patch metamaterial wearable antennas are compact and flexible. The directivity and gain of the antennas with Circular Split-Ring Resonators (CSRR) is higher by 2.5dB to 3dB than the antennas without CSRR. The resonant frequency of the antennas without CSRR is higher by 6% to 9% than the antennas with CSRR. The computed and measured bandwidth of the stacked circular patch wearable antenna with CSRR for IoT and medical applications is around 12%, for S11 lover than −6dB. The gain of the circular patch wearable antenna with CSRR is around 8dBi.

Design and Experimental Study of Two-Cavity Dual-Frequency All-Solid-State Laser with Large Frequency Difference

2010 ◽  
Vol 37 (11) ◽  
pp. 2784-2789
Author(s):  
焦明星 Jiao Mingxing ◽  
邢俊红 Xing Junhong ◽  
刘芸 Liu Yun ◽  
杨云 Yang Yun ◽  
马少华 Ma Shaohua
Keyword(s):  
Experimental Study ◽  
Solid State ◽  
Solid State Laser ◽  
Frequency Difference ◽  
Dual Frequency ◽  
State Laser ◽  
Large Frequency

Experimental Study of the Dual-Frequency Laser Based on the Nd∶YVO4/Nd∶GdVO4 Combined Crystal

2018 ◽  
Vol 55 (9) ◽  
pp. 091407
Author(s):  
金涛 Jin Tao ◽  
胡淼 Hu Miao ◽  
李鹏 Li Peng ◽  
范红丹 Fan Hongdan ◽  
韩宁 Han Ning ◽  
...  
Keyword(s):  
Experimental Study ◽  
Dual Frequency ◽  
Frequency Laser
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