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This letter presents a dual-band multiple input multiple output (MEMO) metamaterial-based antenna. The MEMO antenna system consists of two dual-band antenna elements and two split loop resonators. The antenna operates at 2.45 GHz and 5.25 GHz, suitable for WLAN application. The loop resonators placed in the space between the antenna elements act as metamaterial samples which could control the electromagnetic...
A coupled-fed printed antenna for eight-band covering WWAN/WLAN/WiMAX operation in the mobile phone is presented. The proposed antenna consists of a long radiating strip, a short-circuited inductive shorting strip, and a coupling strip to capacitively excite the radiating strip. By using the capacitive excitation, the long radiating strip with the shorting strip can generate a wide lower band to cover...
With the research and application of monopulse antenna, Sum and Difference become an essential element. As the basic component, the magic-T should be paid attention to. Due to the drawback of large profile in traditional magic-T, one planar magic-T structure working at the Ka-band have been designed and simulated in this letter. The E-arm fed through a longitudinal coupling gap in the proposed structure...
Research is done on arrays composed high gain Yagi antennas with end-fire radiation and vertical polarization. This paper mainly studies different arraying methods of the Yagi antennas and analyzes the coupling effect between array units. It includes arraying in three directions (X, Y and Z). The Yagi antenna unit is microstrip magnetic dipole antenna of which the elements are based on a new microstrip...
A dual-band microstrip filter utilizing zero-degree coupled SIR feed linewith high frequency selectivity is presented. The first two resonant modes of stepped impedance resonators (SIRs) are chosen as the dual-band center frequencies. A pair of folded SIRs are coupled to form a second-order dual-band filter. Meanwhile, the SIRs are surrounded by a pair of zero-degree coupled SIR feed lines which introduce...
In this paper, a new high-QL resonator using a combination of SIR (Stepped Impedance Resonator) shaped hairpin resonator, interdigital capacitor, and meander line with μ-near zero (MNZ) metamaterial is suggested. Interdigital capacitor is applied to a resonator to get high-QL performance and to obtain μ-near zero characteristic for size reduction. Also, the compact elliptic function and slow-wave...
In this paper, an ultra-wideband (UWB) bandpass filter (BPF) composing of a multi-mode resonances SIR is proposed. The SIR provides three resonances to form the passband response. However, the acquired bandwidth (BW) is insufficient and it is remedied by an open and a short-circuit stub, attaching to the SIR in the middle. The added open and short stubs with appropriate length furnish the SIR with...
This paper presents a well performance noise injector that is used in the Q-Band (35–50GHz) dual beam cryogenically cooled receiver of Shanghai 65m Radio Telescope. A good flatness of coupling over a wider frequency spectrum is required in the noise injector. The design is based on the traditional circular waveguide directional coupler. The noise injector exhibits a −31.5dB mean coupling, flatness...
In this work, a compact surface mount (SMT) filter implemented with the substrate integrated coaxial line (SICL) is presented to offer a practical solution for the applications that require flexible filter design. The shielded filter features a low profile and low cross-talk characteristics, and can be assembled or removed from the system conveniently. The six-pole SICL band-pass filter centered at...
This letter presents an oversize 30 GHz bandpass filter with high selectivity. A new kind of discriminating coupling is proposed to suppress the fundamental odd-mode responses of the stub-loaded resonators, whereas the high-order mode responses remain unaffected. No extra circuit is required to realize the oversize design and the fabrication requirement can be released. Moreover, source-load coupling...
In this paper, a miniaturized Marchand balun is designed, which is used for the IF signal transformation of the THz focal plane arrays. In order to reduce the size of the THz front-ends, low temperature co-fired ceramic (LTCC) technology is adopted. Based on multilayer spiral coupled transmission lines, the balun owns high coupling coefficient as well as compact structure. The measured results show...
A compact 3 dB 90º directional coupler is fabricated by integrated passive device (IPD) process on SI-GaAs substrate for long term evolution (LTE) application. The operating frequency is between 800 MHz to 915 MHz, which is the LTE application frequency band 5 and band 8. At the center frequency of 875 MHz, the proposed coupler achieved −0.8 dB of insertion loss and −3.5 dB of coupling. The reflection...
This paper analyzes the basic principle of Y-type waveguide splitter, and then designs a terahertz waveguide splitter based on PBG structure using the principle of photonic crystal band-gap. The operating frequency band is 480GHz-520GHz. Simulation results show that the VS WR is less than 1.3 in the operating frequency range, the S parameters of the input port and the output port are nearly 3.08dB...
This paper describes a intersystem EMC case between two communication vehicles on the plain topography, mainly studies the dielectric properties of the ground soil, establishes a precise communication vehicle model in FEKO5.5and simulates electromagnetic coupling factor between the sending and the receiving antennas in typical communication vehicle system. Test results show that the simulation results...
On platforms environment there are a lot of equipment working at the same time. In the design phase, much work should be done to control or eliminate potential interference. This text researched on microwave antennas interference problem from theory and experiment while we deduced and built receive model of paraboloid antenna. At the end of paper, an experiment has been presented. And the experiment...
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