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In this paper, a wideband substrate integrated waveguide (SIW) cavity backed patch antenna element is proposed for high-gain arrays at millimeter-wave bands. By compensating the inductance of the feeding metallic via with a capacitive ring slot on the ground plate, an additional resonance is introduced to the patch mode to expand the bandwidth. To suppress the backward radiation from the slot and...
In order to increase capacity and reduce power consumption for future cellular networks, new cellular architectures and radio access schemes will be required. Two important technologies for future 5G and 6G networks include Cloud-Radio Access Networks (C-RAN) and Large Scale Antenna Systems (LSAS) with hundred's of low power radios to increase the cell capacity with multi-user MIMO multiplexing and...
High impedance at the drain of a transistor at low frequencies can cause significant distortions in power amplifiers (PAs). This problem is exacerbated by concurrent dual-band signal transmissions required by carrier aggregation. In this paper a technique is proposed which uses a parallel auxiliary impedance branch at the transistor's drain node to maintain low drain impedance for an extensive range...
This paper presents a hybrid two-point modulator for high data rate modulation. The two-point modulator utilizes a phase selection circuit with a high-frequency ΔΣ modulator (DSM) in low-pass modulation to achieve fine resolution for delay mismatch calibration. For high-pass modulation, a separate multi-bit path is designed for a digitally-controlled oscillator (DCO) in addition to the loop control...
In this paper, a novel dual-band bandpass filter (BPF) is developed using the half-mode substrate integrated waveguide (HSIW) cavity with modified split-ring resonators (MSRRs) etched on the waveguide surface. The MSRR composes of an open ring resonator (ORR) with a mender line located in it. The approximate electrical equivalent circuit and filtering response of the CMSRRs Loaded HSIW cavity are...
Wireless power transfer (WPT) is a kind of power transmission technology with which load devices can be supported to take power from the power source in a non-contacting way. Hollow solenoidal coils are used as resonant coils extensively in engineering projects which are usually analyzed based on magnetostatic fields. In practice coils are often excited by alternating currents, and it is particularly...
This paper describes the circuit design and measured performance of a 6-bit 8-GS/s current-steering DAC. A CML interface supporting the maximum conversion rate of 8Gbps is integrated in the chip. A PRBS-7 generator is built in the chip for synchronization as well as for data descrambling. In order to realize good linearity performance, a 2-2-2 segmental architecture is proposed for optimizing the...
Spectrum sensing is a premise for the realization of Cognitive Radio Networks (CRN). This paper considers Spectrum Sensing Data Falsification (SSDF) attack to CRN, where malicious users send false local spectrum sensing results in cooperative spectrum sensing, and it will result in wrong final decisions by the fusion center. A low overhead symmetric cryptographic mechanism utilizing message authentication...
A wide band passive fundamental wave mixer based on the novel broadband balun is proposed in this paper, the new design was simulated and validated by the measurement. Measured results show that about 9dB typical conversion, loss high gain compression and about 10dB return loss are achieved across the bandwidth from 3GHz to 50GHz, and LO-to-RF isolations are higher than 20dB.The results of conversion...
This paper presents a novel orthomode transducer (OMT) with the dimension of WR-10 waveguide. The internal structure of the OMT is in the shape of Y so we named it a Y-junction OMT, it contain one square waveguide port with the dimension 2.54mm × 2.54mm and two WR-10 rectangular waveguide ports with the dimension of 1.27mm × 2.54mm. The operating frequency band of OMT is 70–95GHz (more than 30% bandwidth)...
A low profile tapered slot antipodal Vivaldi antenna has been designed for array-based UWB target RCS imaging system. The antenna design with dimensions of 100mm×40mm achieves satisfactory impedance matching and radiation across the frequency band from 2.8 to 40 GHz with more than 173% fractional bandwidth. Both simulation and measurement results show that good radiation characteristics have been...
To miniaturize the perfect metamaterial absorber, a fractal three-order oblique cross dipole slot structure is proposed and investigated. The fractal perfect metamaterial absorber (FPMA) consists of two metallic layers separated by a lossy dielectric substrate. The top layer etched a three-order oblique fractal-shaped cross dipole slot set in a square patch and the bottom one is a solid metal. A prototype...
This article focuses on the beam scanning capabilities of single layer discrete dielectric lens at the center frequencies of E-band (73.5GHz and 83.5GHz) for next generation high data rate point-to-point communication systems. Radiation characteristics such as scanning range, beam scanning gain loss, side lobe level, beam width and |S11| matching are investigated in details for the scanned beams both...
A novel planar antenna with slots for GPS/WLAN/UWB applications is presented in this paper. With three bands, the proposed antenna consists of a modified ground and a radiation path. For GPS L1, WLAN and UWB bands, several narrow strips and slots are etched into the radiation patch and ground plane to revise resonance paths. The antenna and ground can radiate simultaneously to improve the radiation...
W band multiplier with excellent harmonic suppression is of great importance in high frequency applications. In this paper, a balanced topology structure has been analyzed and applied in W band frequency tripler design. UMS 0.1 um GaAs pHEMT process is employed to fabricate the balanced tripler and the measured results prove that the harmonic suppression is more than 24 dBc. Driven by −0.5 dBm input...
A double active gm-boosted-based inductorless differential wideband low-noise amplifier (LNA) is proposed in this paper. The proposed LNA applies two common-gate (CG) stages and the capacitive cross-coupled (CCC) technique. Moreover, a noise-cancelling architecture is adopted for low noise factor (NF). The proposed LNA is simulated in a TSMC 0.18-µm RF CMOS process.Within DC-1.2GHz, the LNA achieves...
A 0.1–6 GHz fully differential common gate low noise amplifier (CGLNA) is proposed in this paper. High equivalent transconductance (gm) is realized with active transconductance-boosting with cross coupling capacitance. By introducing a positive feedback path in active transconductance-boosting circuit, this circuit increases freedom of transconductance, thus alleviates the trade-off between input...
In this paper, a compact quarter-wavelength stepped-impedance resonator bandpass filter is proposed, two extra transmission zeros are implemented by source-load coupling between the feedlines, a filter with two resonators is designed, each resonator consists of a low-Z section and a high-Z section, good performance is achieved both in passband and stopband. Demonstrator filter is designed on the Rogers...
This paper deals with the implementation of a RF Doherty Power Amplifier (DPA) with the objective of improving the average efficiency. This technique is an interesting way to provide efficient PA for high PAPR signal of more recent standards of communications. The Doherty principle is applied to a 2.5GHz fully integrated PA on a CMOS 65nm technology. The DPA exhibits 23.4dBm output power, 15dB of...
A multiband compact planar terminal antenna is designed and proposed in this paper, which is suitable for multi-functional wireless communication systems. The proposed antenna consists of a patch with two slots on it and a meandered strip loaded on the top. Two parasitic stubs are etched at the back of the antenna to widen the operating frequency band. The operating bandwidths of the antenna cover...
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