A dual‐band branch line coupler for LTE 0.7 GHz and LTE 2.6 GHz frequencies

Abstract

In this paper, a dual‐band branch line coupler (BLC) for Long Term Evolution (LTE) 0.7 GHz and LTE 2.6 GHz frequencies is designed and developed. A dual‐band quarter wave transmission line (DBQWTL) capable to perform dual band operation for frequency ratio >3 is also proposed. The dual band BLC is designed by replacing the quarter wave transmission line of the conventional single band BLC with the proposed DBQWTL. By means of even and odd mode analysis, the closed form design equations of the proposed DBQWTL are obtained. Considering the implementation viewpoint of the proposed BLC, the circuit parameter analysis is carried out. The proposed BLC performs dual band operation with maximum amplitude imbalance of 0.26 dB and phase deviation of 3.07°. It is found in the comparative analysis that the proposed BLC has novelty in terms of its operating frequency ratio range.

Octa-port High Gain MIMO Antenna Backed with EBG for mm-Wave Applications

“…The increasing requirement for higher data throughput as well as constantly increasing carrier bandwidth has resulted in the advancement of wireless communication networks [1,2]. Long-term evolution (LTE) and 4G standards are used by modern wireless systems to accommodate massive amounts of data and increasing bandwidth requirements [3,4]. However, LTE/4G standards can only provide up to 20 Mbps of bandwidth, and mm-wave bands are required to achieve data speeds in Gbps [5,6].…”

Coupled‐line rat‐race couplers with smooth in‐phase and out‐of‐phase performances

“…Besides, couplers with dual-band characteristics have been proposed. 10,11 Phase performance is an important feature for rat-race couplers. For these designs, there is a disadvantage that their phase performance would be influenced heavily by the frequency.…”

“…Based on the novel structure, a wider bandwidth is obtained without defected ground planes and a multilayer process. Besides, couplers with dual‐band characteristics have been proposed 10,11 . Phase performance is an important feature for rat‐race couplers.…”