Query: Quasi-Yagi

title: MM Wave Phased Array Quasi Yagi Antenna for the Upcoming 5G Cellular Communications
abstract: The focus of this manuscript was to propose a new phased array antenna design for the fifth generation (5G) mobile platforms. Eight elements of compact Quasi Yagi antennas were placed on the top portion of smartphone printed circuits board (PCB) to form a beam steerable phased array design. The 10 dB impedance bandwidth of proposed 5G smartphone antenna spans from 25 GHz to 27 GHz providing 2 GHz bandwidth with less than 16 dB mutual coupling function. A coax to microstripline with a truncated crown of vias around the coaxial cable was used as a feeding mechanism for each radiation element. An Arlon Ad 350 substance with properties of e 3.5, d 0.003, and h 0.8 mm was chosen as the antenna substrate. The proposed phased array antenna provides wide angle scanning of 0deg~75deg with more than 10 dB realized gain levels. For the scanning angle of 0deg~60deg, the antenna array provides more than 90% 0.5 dB) radiation and total efficiencies. In addition, the specific absorption rate (SAR) function and radiation performance of the design in the presence of the user hand/user hand have been studied. The results validate the feasibility of the proposed design for use in the 5G handheld devices. Furthermore, using the presented Quasi Yagi elements, the radiation properties of 2 x 2, 4 x 4, and 8 x 8 planar arrays were studied and more than 8.3, 13.5, and 19.3 dBi directivities have been achieved for the designed planar arrays. The results show that the designed arrays (linear planar) satisfy the general requirements for use in 5G platforms.

title: Quasi Yagi Antenna Array With Modified Folded Dipole Driver for mmWave 5G Cellular Devices
abstract: A novel quasi Yagi antenna is proposed for millimeter wave (mmWave) 5G cellular handsets operating in the 28 GHz band. The proposed antenna is designed to be compact through modification of the planar folded dipole topology so that it can be mounted inside a compact mobile terminal. A vertically stacked structure utilizing a multilayer printed circuit board (PCB) and via holes is applied to the antenna topology to minimize the antenna lateral width while maintaining the characteristics of the planar folded dipole antenna. A single antenna yields a $10 dB bandwidth for a return loss of 12.3% (26.3 to 29.75 GHz) and a gain of 5.51 dBi at 28 GHz. The change in beam patterns due to the chassis effect when four element linear arrays are inserted into the upper and side edge inside the terminal is analyzed.

title: Wideband Beam Switchable 28 GHz Quasi Yagi Array for Mobile Devices
abstract: The goal of this paper is to propose a new antenna array architecture that aims to solve the most known limitations of phased antenna arrays, resulting a good candidate for next 5G mobile handsets. The architecture consists of five quasi Yagi antennas printed on the short edge of a Roger RO3003 substrate, pointing in different directions, and a switch to feed each antenna and steer the beam. Simulations prove that the antenna array can cover the angle of over 180deg with high gain over the frequency range from 26 to 40 GHz. Alternative designs to make the structure more compact further demonstrate the validity of the concept. The optimized corner array of four elements is fabricated and passive and active measurements are performed with the Microwave Vision Group (MVG) Starlab 50 GHz. The results of the passive measurements are in accordance with the simulations and show that the proposed quasi Yagi antenna array has large coverage over the whole bandwidth and peak gain of 8 dBi at 28 and 38 GHz. The active measurements of the array connected to the front end module (FEM) and integrated in the phone case further confirm the radiation properties of the switchable antenna array at 28 GHz in a quasi real scenario.

title: A Wideband Sectoral Quasi Yagi MIMO Antenna System With Multibeam Elements
abstract: A novel printed Quasi Yagi based multiple input multiple output (MIMO) antenna system is proposed in a triangular configuration targeting sectors of 120deg. A novel and simple proof of concept for splitting the single main endfire directional beam of a typical Yagi Uda antenna into multiple beams is proposed by carefully exciting the $3.5~ \lambda _{\text g} resonance mode of the loop antenna. It has been shown that by proper excitation of the loop resonance modes, multiple beams can be achieved from a single Yagi element to suit the application of interest. The proposed MIMO antenna system has a measured impedance bandwidth of 16.2% targeting the 5.8 WLAN band. The board diameter of the antenna system is only 120 mm, making it suitable for small size wireless access points. A high front to back ratio (FBR) of 14 dB and a gain of around 6 dBi is achieved by carefully optimizing the multiple parasitic director elements in the location of the maximum energy densities. The proposed MIMO antenna system has high port isolation of 28 dB, very low field envelope correlation coefficient value of 0.012, and high total radiation efficiency of greater than 90% in the band of operation.

title: Wideband High Gain Printed Quasi Yagi Diffraction Gratings Based Antenna for 5G Applications
abstract: A broadband high gain printed Quasi Yagi antenna with a perturbation based planar dielectric lens is presented. The perturbation design parameters are based on the diffraction gratings theory for gain enhancement, radiation pattern improvement, and higher order modes suppression. The proposed antenna provides 94.5% aperture efficiency with a high gain of 15 dBi at 30 GHz, high radiation efficiency of ~90% and (24 40) GHz ultra wide matching (S11 10 dB) bandwidth. The measured cross polarization is lower than 20 dB in both <inline formula> <tex math notation="LaTeX"{E} /tex math>/inline formula> and <inline formula> <tex math notation="LaTeX"{H} /tex math>/inline formula> planes. With these features in addition to being low profile and lightweight, this antenna is suitable for various millimeter wave applications.

title: Tunable Bandpass to Bandstop Quasi Yagi Uda Antenna With Sum and Difference Radiation Patterns
abstract: A design of the double element E plane quasi Yagi Uda antenna is proposed offering two different radiation patterns and reconfigurable bandpass to bandstop frequency tunable responses. The double element antenna covers a wide frequency range that is exploited for the realization of the tunable operation modes. This is achieved by the integration of a pair of bandpass to bandstop filters, each of which can be reconfigured using two varactor diodes and one p i n diode. The p i n diode serves the function of switching between bandpass and bandstop states, and the varactors facilitate the frequency tunability for both states of operation. The bandpass filter provides a continuous frequency tuning function with a minimum rolloff rate of 57 dB/GHz and out of band transmission coefficient 12 dB. The bandstop filter provides a continuous tuning function with in band zero 13 dB and out of band pole 1 dB. Importantly, the reconfigurable filtering functionality of the two element antenna is preserved when fed by a wideband hybrid coupler to produce both the sum and difference radiation patterns. To obtain a high beam symmetry, the antenna elements are fed by the difference <inline formula> <tex math notation="LaTeX"\Delta /tex math>/inline formula> signal to produce the directive radiation pattern and they are fed by the sum <inline formula> <tex math notation="LaTeX"\Sigma /tex math>/inline formula> port to produce the null in the main radiation direction. The experimental results validate this concept with a measured tunability of 50.0% for the bandpass state and 50.4% for the bandstop state.

title: A Deployable Quasi Yagi Monopole Antenna Using Three Origami Magic Spiral Cubes
abstract: We propose a deployable quasi Yagi monopole antenna using origami magic spiral cubes, constructed from low cost paper substrate. The proposed quasi Yagi antenna consists of an L shaped driven monopole, an L shaped reflector, and two L shaped directors. These driven monopole, reflector, and directors are designed in L shaped geometries to achieve maximum gain in a limited cube size. The driven element and reflector are realized on the origami magic cube #1, while the two directors are designed on the magic cubes #2 and #3, respectively. The cubes are stacked together using a thin adhesive film. The presented geometry of the origami magic spiral cube antenna can be easily folded and unfolded. The dimensions in the unfolded state are 44 mm x 44 mm x 132 mm while the dimensions in the folded state are 44 mm x 44 mm x 8 mm. Therefore, in the folded state, the antenna occupies only 6% of the unfolded volume. We have numerically analyzed the antenna performance and verified the outcomes experimentally. The L shaped reflector has increased the monopole antenna gain from 1.9 to 5.7 dBi. With the addition of two directors, the gain is further increased to 7.3 dBi at 1.9 GHz.

title: A Compact Planar Quasi Yagi Antenna With Bandpass Filtering Response
abstract: A planar quasi Yagi antenna with bandpass filtering response is presented. The quasi Yagi antenna consists of a double sided printed driven dipole, an offset double sided parallel strip line (DSPSL) director, a DSPSL reflector, and an offset DSPSL parasitic element. Both the reflector and the parasitic element can produce an extra radiation null at the band edges of the passband, and the parasitic element can also generate an additional resonance within the passband. As a result, a compact wideband quasi Yagi antenna with quasi elliptic bandpass filtering response is obtained, without requiring any extra filtering circuit. In addition, the antenna is fed by a balanced DSPSL, and therefore, no balun is needed, leading to a very simple feeding structure. For demonstration, a prototype operating at 2.4 GHz was designed and measured. The prototype has a low profile of $0.006\lambda _{0} a 10 dB impedance bandwidth of 30.4% an average gain of 5.7 dBi over the passband, and an out of band suppression level of about 20 dB in the near stopbands.

title: Bioinspired DNA Origami Quasi Yagi Helical Antenna with Beam Direction and Beamwidth Switching Capability
abstract: We propose a bioinspired origami quasi Yagi helical antenna with beam direction and beamwidth switching capability based on transformable DNA origami structure. Each DNA molecule consists of a double helical chain, and its length can be transformed by folding and unfolding. When three transformable origami DNA structures are applied to the quasi Yagi helical antenna, beam direction and beamwidth can be controlled by folding and unfolding the origami DNA. The transformable DNA structures act as driven, director and reflector elements. The proposed DNA origami antenna provides four beam direction switching states (three states with narrow beamwidth and one state with wide beamwidth) at fixed frequency of 1.9 GHz. For example, the main beam direction of the proposed antenna can be steered to 30deg, 0deg, +30deg and 40deg for states 1, 2, 3 and 4, respectively. State 4 provides a 3 dB wider beamwidth of 104deg, whereas the beamwidth of other states is narrower than 64deg. The proposed concept is numerically and experimentally demonstrated.

title: Dual Band Quasi Yagi Antenna Gain Enhancement by using a Reflector Plate
abstract: A dual band microstrip patch dipole loop antenna with the reflector element is presented in this paper. The study focuses on the gain enhancement for a dual band quasi Yagi antenna by using a copper plate as a reflector. The antenna is simulated and realized on FR4 epoxy substrate and contains two different radiating elements and two different bands; a loop and a dipole geometry, operate 2.4 GHz and 3.5 GHz, respectively. The gain of the antenna is increased from 1.3 dB to 6.5 dB for 2.4 GHz and 5.2 dB to 8.3 dB for 3.5 GHz with required radiation characteristics. The antenna has a dual band characteristic that may have a usage in the 5G mobile communication and Wi Fi applications. The purpose is to minimize the reflector dimensions to have a compact and cheap antenna structure. This antenna is designed for the system bridging remote control of indoor or outdoor application via operators using 5G technology. By using the proposed antenna devices can connect to a 5G network and be controlled from outside automatically. By increasing the directivity, the power consumption is reduced and the service quality is increased.