Analysis and Design of High Gain Slotted SIW array antennas at millimeter wave frequencies are explained in this paper. This work includes the designing of Substrate integrated waveguide, designing of Microstrip to SIW transition, designing of slotted SIW antenna, designing of 1X2 power divider with slotted SIW array antenna. The Proposed SIW slot array antennas are simulated at 30 GHz and Performances are compared in terms of return loss, gain and HPBW. The Proposed SIW array antennas and other required designs are modelled in HFSS 3D Electromagnetic software.

Design and Analysis of High Gain Slotted SIW Array Antennas at Ka-Band

High gain millimeter wave antennas for 5G wireless and security imaging systems

|A high performance substrate integrated waveguide (SIW) slotted array antenna with low sidelobe level and optimum gain at 28 GHz is designed, and experimental results are presented with simulated data. In order to achieve a low sidelobe level, Chebyshev power coeﬃcients in the form of slot displacements are applied to the SIW array antenna. A MATLAB program has been written to (cid:12)nd these slot displacements. This work entails investigating and designing the optimum microstrip to SIW transition over the Ka-band, designing a 1 (cid:2) 8 slotted SIW array antenna, and (cid:12)nally applying the Chebyshev power coeﬃcients to the slots of the 1 (cid:2) 8 SIW array antenna. The fabricated prototype of a 1 (cid:2) 8 SIW slotted array antenna is tested, and its performance is studied in terms of gain and half power beam width (HPBW), compared with simulations. The measured results of the 1 (cid:2) 8 slotted SIW array antenna at 28 GHz have a j S 11 j of better than (cid:0) 20 dB, a gain of 13 dB, and an HPBW of 17 ◦ . The overall dimensions of the design at 28 GHz are 7 : 143 mm (cid:2) 51 : 8 mm (cid:2) 0 : 254 mm (0 : 667 (cid:21) o (cid:2) 4 : 84 (cid:21) o (cid:2) 0 : 023 (cid:21) o = 0 : 0766 (cid:21) 3 o mm 3 ).

High Performance Millimeter Wave SIW Slotted Array Antenna

A general decoupling technique for increasing the port isolation between two closely packed antennas is proposed in this paper. The two antennas are first modeled by a π-shaped circuit from its S-parameters. Then, the detailed decoupling method is discussed to increase the port isolation where an optimization objective of maximum energy unbalance is adopted. Taking two closely parked patch antennas for example, good agreements between the theoretical analysis and full wave simulation are obtained. The present technique can increase the port isolation, thus the total efficiency, correlation coefficient and diversity gain are improved. Such a general decoupling technique can also be applied to any other antenna types.

A Decoupling Technique for Increasing the Port Isolation Between Two Closely Packed Antennas

: SCAMP is a small, single-channel, antijam, man-portable terminal used for extremely high frequency (EHF) satellite communication. Since its development in 1987. it has repeatedly demonstrated successful communication through the EFIF packages on the FLTSAT-7 and -8 Navy communications satellites. Advanced SCAMP is the second generation small terminal, highly elevated in performance and significantly reduced in weight, currently being developed at Lincoln Laboratory. Pertinent parameters are its 30-lb total weight, 75- to 2,400-bps data rate, and 24-in antenna aperture. Starting with the basic dual-band feed developed for another application, a compact, high-performance, EHF dual-band ring-focus feed with an elliptical subreflector was developed for a displaced axis parabolic reflector. This reflector is made up of six lightweight deployable petals for portability. The feed weighs less than 1 lb, and the reflector weighs 2.6 lb. The measured added loss due to imperfections of the petal reflector for the 44.5- and 20.7-GHz bands are 0.3 and 0.1 dB, respectively. An overall antenna efficiency of about 65% and 55% in the Q- and K-bands, respectively, was achieved. Antenna and feed design considerations, measured performance, and other possible applications for this antenna are discussed.

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A Compact, Portable EHF/SHF Antenna for Advanced SCAMP

Design and Analysis of Microstrip to Substrate integrated waveguide and SIW to Microstrip transition at Ka-band for mm-wave applications are explained in this work. These transitions are further helpful for design and interconnection of microwave components like filters, power dividers, resonators and antennas. Simple microstrip taper is used as a transition between microstrip and SIW. In this, mainly the design procedure and formulas are explained for air filled rectangular waveguide (RWG) to SIW and transition between microstrip line and SIW. The proposed microstrip to SIW configuration is modeled in Ansoft HFSS 3D EM Software. The Fabricated microstrip to SIW transition is tested with vector network analyzer and compared with simulated results.

Studies on Microstrip to SIW transition at Ka-Band

LHCP and RHCP analysis of microstrip patch antenna at 5.2 GHz has been discussed in this work. A linearly polarized coaxial fed microstrip patch antenna has been modeled in ANSYS HFSS. To analyze the Left Hand Circular Polarization(LHCP) and Right Hand Circular Polarization (RHCP) Patch structure is modified respectively. To differentiate between LHCP and RHCP Field analysis and Gain analysis has been done. All the three microstrip patch antennas modeled on 1.6 mm thick FR4 substrate with the Dielectric constant 4.4. For the designed microstrip patch antennas return loss, gain and axial ratio observed. For linearly polarized microstrip patch antenna axial ratio is 63dB and for circularly polarized microstrip patch antenna axial ratio less than 2dB observed. For LHCP microstrip patch antenna LHCP Gain approximately 20dB greater than RHCP Gain and for RHCP microstrip patch antenna RHCP Gain approximately 20dB greater than LHCP Gain is observed. Fabrication of linearly polarized antenna and LHCP antenna has done. measured return loss and VSWR results compared with the simulated antenna results.

Analysis of LHCP and RHCP for Microstrip Patch Antenna

Analysis and Design of 1X4 Rectangular microstrip patch antenna array with corporate microstrip line feeding for high gain applications at mm wave frequencies are explained in this work. Prerequisites to design a 1X4 array antenna are a single patch antenna and 1X2 array antenna design. For that, a single patch antenna with quarter wave impedance matching technique has been designed followed by 1X2 microstrip patch array antenna with corporate line feeding. optimization of both designs for the antenna parameters like return loss and gain are carried out. As extension of 1X2 Array, design has been modified into 1X4 array antenna and observed good return loss of 30dB and Gain of 12. 6dB. While increasing the antenna elements, increased antenna gain around 3dB and reduced HPBW in XZ-plane are observed. All the above three antennas are modelled in Ansoft HFSS 3D EM Software. The return loss and VSWR of Fabricated 1X4 array antenna is tested with network analyzer and compared with the simulated results.

Srujana Vahini Nandigama

Papers

Studies on Microstrip to SIW transition at Ka-Band

Design and Analysis of High Gain Slotted SIW Array Antennas at Ka-Band

Analysis of LHCP and RHCP for Microstrip Patch Antenna

Design and Analysis of a Microstrip Antenna Array for High Gain Applications at mm wave frequencies

High Performance Millimeter Wave SIW Slotted Array Antenna