Abstract-A novel RF interference rejection technique using four-port network is presented in this paper by using two diplexers combined together. This technique offers the signal isolation of 68.46 dB between transmitter and receiver module, which is the best figure ever reported. The four-port network exploits both high and low-Q factor filters for the cost reduction. The design tolerance with phase deviation between 180 o and 183 o of four-port network was investigated and the novel concept still has signal isolation (S32) of better than 65.47 dB, which is still superior compared to the existing diplexer. Finally, RF interference rejection technique can be used in wireless communication systems whereas small size, low losses and low complexity are required.

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-Design techniques for a new class of integrated monolithic high permittivity ceramic waveguide filters are presented. These filters enable a size reduction of 50% compared to air-filled TEM filters with the same unloaded Q-Factor. Designs for both chebyshev and asymmetric generalized chebyshev filter are presented, with experimental results for an 1800 MHz chebyshev filter showing excellent agreement with theory.

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Please cite this article as: Muhammad Y. Sandhu,IanC.Hunter,NigelS.Roberts,Development of an open-ended microstrip stub apparatus and technique for the dielectric characterization of powders, Powder Technology (2016Technology ( ), doi: 10.1016Technology ( /j.powtec.2016 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT AbstractA new apparatus and method to characterize the complex dielectric permittivity of powders is described. The complex permittivity of a range of detergent powder agglomerates with different moisture levels, at ambient and elevated temperatures, has been determined using this technique. Results are consistent with A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 predictions of how the water interacts with the different components of the detergent particles at these different conditions.

The aim of this article is to design a simple receiver, which can jointly estimate the frequency selective channel impulse response, frequency independent transmit/receive IQ imbalance, and carrier frequency offset with minimal training and implementation complexity. The estimation of carrier frequency offset is performed using 2 scalable solutions. To estimate the frequency selective channel impulse response and frequency independent transmit/receive IQ imbalance, we proposed 2 different estimation techniques. The first technique is an iterative approach stemming from a doubly linear model of the transmission system in the presence of transmit/receive IQ imbalance and frequency selective channel impulse response, while the second approach is a least squares solution. Both these schemes provide a good performance/complexity trade-off. Although the iterative estimates of channel impulse response are not optimal, they do provide a near ideal bit error performance. The proposed scheme blends seamlessly with Institute of Electrical and Electronics Engineers 802.11 standard but can be adapted to work with any orthogonal frequency-division multiplexing standard. KEYWORDSCFO and IQ imbalance estimation, direct conversion devices, multicarrier systems 1 Int J Commun Syst. 2017;30:e3277. wileyonlinelibrary.com/journal/dac How to cite this article: Ali MA, Sandhu MY, Waqar O, Rahimo AQ. Receiver design for multicarrier transmission systems in presence of Tx/Rx imperfections. Int J Commun Syst. 2017;30:e3277.