RF Front End for LTE Receiver
Dalia Hussein Sadek Kamal;
Abstract
The development of wireless communication systems into multi-standard radio architectures that can process a multitude of frequency bands and modulation schemes has led to a growing demand for wideband receiver front-ends. To allow for portability and low cost, these new architectures also need to be compact size,low power. These requirements have made the simple architecture of the Zero IF receiver, especially attractive for this application. The design of a Zero IF receiver that comply the new standards LTE meets several challenges. The new standards take advantage of the multi carrier modulation scheme OFDM to increase spectral efficiency, which demands for higher linearity because of a non-constant signal envelope. Zero IF architectures consist of two main parts,the first part is the passive one which consists of an antenna and bandpass filter and the second part which is the active part consists of Low noise amplifier, demodulator and synthesizer.The frequency spectrum allocated for an LTE range from 700MHz to 2.7GHz.
This thesis focuses on the design and implementation of zero if LTE receiver operates at band 36 TDD(1930-1990) MHz. The proposed receiver consists of two parts a passive part, an antenna and hairpin filter and an active part which is the LNA, demodulator and frequency synthesizer.
The first goal is to design and fabricate the passive components of thefront end receiver which area microstrip patch antenna with defected ground structure and a third order hairpin bandpass filter.The antenna and filter are analyzed using Computer Simulation Technology (CST) Microwave Studio.The proposed devices are fabricated using FR-4 material substrate. The overall dimensions of the antenna are43mm x36mm x1. 6mm.the antennaoperates between 1923 MHz to 1990 MHzfor return loss -10 dB and covers LTE network band 2 FDD mode downlinkand band 36 TDD mode. The simulation results were 2.67dBi directivity and1.242dB gain with omnidirectional radiation pattern, a return loss of -31.85dB at resonant frequency 1950MHz and 70 MHz minimum bandwidth at -10 dB return loss.
The hairpin third order band pass filter with overall dimensions 38.6mm x32.16mm x1.6mm, center frequency of 1950 MHz and -3dB BW of 90 MHzin addition to a fractional bandwidth of 4.615%. The filter covers LTE network band 36(TDD).
This thesis focuses on the design and implementation of zero if LTE receiver operates at band 36 TDD(1930-1990) MHz. The proposed receiver consists of two parts a passive part, an antenna and hairpin filter and an active part which is the LNA, demodulator and frequency synthesizer.
The first goal is to design and fabricate the passive components of thefront end receiver which area microstrip patch antenna with defected ground structure and a third order hairpin bandpass filter.The antenna and filter are analyzed using Computer Simulation Technology (CST) Microwave Studio.The proposed devices are fabricated using FR-4 material substrate. The overall dimensions of the antenna are43mm x36mm x1. 6mm.the antennaoperates between 1923 MHz to 1990 MHzfor return loss -10 dB and covers LTE network band 2 FDD mode downlinkand band 36 TDD mode. The simulation results were 2.67dBi directivity and1.242dB gain with omnidirectional radiation pattern, a return loss of -31.85dB at resonant frequency 1950MHz and 70 MHz minimum bandwidth at -10 dB return loss.
The hairpin third order band pass filter with overall dimensions 38.6mm x32.16mm x1.6mm, center frequency of 1950 MHz and -3dB BW of 90 MHzin addition to a fractional bandwidth of 4.615%. The filter covers LTE network band 36(TDD).
Other data
| Title | RF Front End for LTE Receiver | Other Titles | مستقبل لاسلكى لشبكة إل تى إ | Authors | Dalia Hussein Sadek Kamal | Issue Date | 2015 |
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