An optically reconfigurable dual-band branch-line coupler with artificial transmission lines

This paper demonstrates switches that achieved a frequency shift of 30% from all switches off to all switches on in both frequency bands. This study shows the advantages of this approach such as high-speed switching, electromagnetic transparency, and thermal and electrical isolation between the coupler and the control circuit. The use of the artificial transmission lines significantly decreases the overall size of the circuit

Dual-band Filtenna Array for WLAN Applications

This paper presents the design and results of a dual-band antenna array integrated with bandpass filters for WLAN applications. The array is fed with a single 50 Ω port and consists of two radiating elements; thereby having a 1x2 array structure. The two bands of the antenna array correspond to the two WLAN bands of 2.4 GHz and 5.8 GHz. A standalone array has first been designed. Other than the two fundamental resonant frequencies, the standalone array exhibits spurious harmonics at various other frequencies. For the suppression of these harmonics, the array has been integrated with two bandpass filters, centered at 2.4 GHz and 5.8 GHz. The resulting filtenna array was simulated, fabricated and measured. Obtained simulation and measurement results agree well with each other and have been presented to validate the accuracy of the proposed structure. Measured return loss of the structure shows dual-bands at 2.4 GHz and 5.8 GHz of more than 30 dB each and also a successful suppression of the spurious harmonics of the antenna array has been achieved. Radiation patterns have also been simulated and measured and both results shown. The gain and efficiency have also been presented; with the values being 6.7 dBi and 70% for the 2.4 GHz band and 7.4 dBi and 81% for the 5.8 GHz band respectively

Dual-band WLAN Antenna Array with Integrated Bandpass Filters for Harmonic Suppression

This paper presents the design and results of a dual-band antenna array integrated with bandpass filters. The array has a 1×2 configuration. The two bands of the array correspond to the two WLAN bands of 2.4 GHz and 5.8 GHz. Other than the two main bands, the standalone array exhibits spurious harmonics at various other frequencies. For the suppression of these harmonics, the array is integrated with two bandpass filters, centered at 2.4 GHz and 5.8 GHz. The filtering array was simulated and fabricated. Measured results show dual-bands at 2.4 GHz and 5.8 GHz at a return loss of more than 30 dB and also a successful full suppression of the spurious harmonic

Evaluation of Waveform Candidates for 5G Wireless Communications

In this paper, we evaluate the waveform candidates for 5G wireless communications such as FBMC and UFMC and 4G’s cyclic prefix CP-OFDM. Measured results for 1.4 MHz and 3 MHz waveforms show a 5 dB reduction in ACPR between FBMC and UFMC. Simulation and measured output power spectra of the power amplifier for 3 MHz and 10 MHz waveforms are match very well

CAD for broadband wireless access design

The paper looks at the multifunctional and specialized CAD systems of leading companies for use in the field of broadband wireless equipment design. The basic characteristics of appropriate software and design systems are shown including the most typical examples for their implementatio

Distortion correction of LDMOS power amplifiers using hybrid RF second harmonic injection/digital predistortion linearization

An LDMOS RF power amplifier for RF multichannel wireless systems with improved IMD performance characteristics is presented. The application of two combined linearization methods is being tested with the help of circuit simulation software ADS. The injection of the fundamental signal's second harmonic in the RF amplifier, as well as a digital predistortion technique, is combined in order to achieve IMD improvement. By proper selection of phase and amplitude of the injected second harmonic signal, it is possible to reduce IMD products that have already been reduced by the well established method of digital predistortion

High-Q dielectric combline resonator with wide spurious free performance

Lower dielectric constant material loaded Combline resonators achieve high-Q and excellent spurious free performance is presented. A design and characteristics are discussed. Simulated responses are presented in this paper

Novel folded SRR-loaded waveguide bandpass filters

A novel class of E-Plane, low-cost, compact and metamaterial-based filter structure using FSRRs for microwave, millimeter wave applications has been proposed. The proposed FSRR-loaded waveguide bandpass filter has been designed and simulated at 9.45 GHz. The structure can be easily realized with a single metal insert within a rectangular waveguide. This kind of filter can be found in applications particularly in the mm-wave range circuits, e.g. in diplexers and multiplexers

Compact multilayer SRR-loaded integrated waveguide filters on liquid crystal polymer substrate

This article presents a compact bandpass filters based on rectangular substrate integrated waveguides and split ring resonators for implementation in multilayer LCP technology were proposed. Filter which included two sections of E-resonator and SRR was tuned up to central frequency of about 28 GHz and bandwidth of about 2 GHz