Low frequency digitally programmable universal filter for communication system

2014 ◽  
Author(s):  
Devesh Singh ◽  
Neelofer Afzal ◽  
Divya Asija ◽  
Sachin Kumar Yadav
Keyword(s):  
Communication System ◽  
Low Frequency ◽  
Universal Filter ◽  
Digitally Programmable

scholarly journals A Design of Dual Broadband Antenna in Mobile Communication System

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Jianming Zhou
Keyword(s):  
Mobile Communication ◽  
Communication System ◽  
High Frequency ◽  
Microstrip Line ◽  
Low Frequency ◽  
Dielectric Substrate ◽  
Frequency Bandwidth ◽  
Broadband Antenna ◽  
Feeding Method ◽  
Frequency Unit

A design of dual broadband antenna is proposed in this paper; it consists of one low frequency unit and two high frequency units. The low frequency unit consists of a pair of printing vibrators; the high frequency unit consists of a pair of printing oscillators, which is bent at its end, and high frequency unit and low frequency unit are set on the same dielectric substrate. Through adding a parasitic unit on antenna, it can enhance frequency bandwidth without affecting the bandwidth. In the high frequency unit, it adopts gap-coupled microstrip line feeding method in order to get enough bandwidth. Through the test of dual broadband antenna, it can be found that, in the low frequency part, the antenna covers 20% bandwidth of the total bandwidth, and it covers the frequency from 800 MHz to 980 MHz. In the high frequency, the antenna covers 60% of total bandwidth and its frequency is from 1540 MHz to 2860 MHz, so the designed antenna can satisfy the frequency requirements of 2G/3G/LTE (4G) communication system.

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