Milad Sharifi Sorkherizi

Lowloss planar bandpass filters for millimeter-wave application

A new printed planar technology is introduced for efficient TEM bandpass filters in millimeter band. The new technology is self-packaged and shows excellent insertion losses compared to microstrip filters. The designs are based on newly introduced ridge gap waveguide, which is composed of printed parallel plate waveguide surrounded by arrays of bed of mushrooms. Several example are designed and optimized. Sample measured results are presented.

Wideband Low-Loss Magnetoelectric Dipole Antenna for 5G Wireless Network With Gain Enhancement Using Meta Lens and Gap Waveguide Technology Feeding

In this paper, a wideband magnetoelectric (ME) dipole antenna excited by a slot coupled to a fork-shaped printed ridge gap waveguide is proposed. To enhance the antenna gain, a meta lens consists of three layers of split ring resonators (SRRs) are integrated horizontally in front of the ME dipole antenna. Each slab contains a 3×7 array of SRR unit cells. The matching bandwidth is improved as a secondary effect of the lens. A 1 × 4 array is designed to provide more gain by adjusting the lens between the edge elements of the four-element array. The antenna is fabricated and tested. The measured results show that -10 dB S11 is obtained between 26.5 and 38.3 GHz. The measure realized gain is better than 15 dBi over the frequency range of 28-38 GHz. A 90% radiation efficiency at 30 GHz is achieved.

Substrate Integrated Horn Antenna Loaded With Open Parallel Transitions

The substrate integrated H-plane horn antenna has been struggling with very limited impedance bandwidth since its invention, which is coming from its natural aperture discontinuity. Apart from a variety of series transitions introduced so far, here, parallel transitions are applied to the antenna aperture in addition to narrow slots on the horn walls around the aperture to widen the antenna impedance bandwidth. It is shown that the depth of the transitions can easily determine the center frequency of the matching bandwidth. The new parallel transitions also reduce the antenna back radiation since they act as chokes around the horn aperture.

Single-Element Antenna Loaded With Artificial Mu-Near-Zero Structure for 60 GHz MIMO Applications

This paper presents a new technique to manipulate the electromagnetic waves emanating from a Bowtie antenna loaded with parasitic 2 × 4 arrays of a double-sided split-ring resonator as a mu-near-zero metamaterial to generate a dual-beam far field pattern over 55-68 GHz. The arrays are integrated vertically in front of the Bowtie antenna and tilted by 15° with regard to the antenna axis to tailor the radiation beam. The resulting measured results confirm the simulated design. The beams are directed symmetrically ±30° with respect to the end-fire direction in the E-plane over 56-66 GHz. The antenna provides a peak-realized gain of 11.4 dBi at 62 GHz.

Fully Printed Gap Waveguide With Facilitated Design Properties

An improved concept is introduced to facilitate the design of low-loss planar circuits using printed gap waveguide technology. The method is based on using separate layers to realize the EBG cells and the lines. As a result, the operating bandwidth of the waveguide is increased compared to the printed ridge gap waveguide. Also, the design process is simplified regarding the placement of the cells around the resonators and lines. Measured results of a line with two 90° bends and a quadruplet bandpass filter are presented that prove the concept. A transition to microstrip line is used in order to acquire the ability to use test probe fixture.

Design of integrated diplexer-power divider

A new configuration is introduced to integrate diplexers and power dividers. The proposed configuration is based on coupling matrix. The design of the lumped element network is based on addition of an extra term to the conventional error function of the coupling matrix to decouple the two ports of the power divider. An optimized lumped element network is implemented successfully on an EBG based guiding technology known as ridge gap waveguide. The optimization of the physical structure is done efficiently by dividing the diplexer-power divider into many sub-circuits and analyzing the corrected delay response of them.

Transition from microstrip to printed ridge gap waveguide for millimeter-wave application

A simple and efficient transition from microstrip to printed ridge gap waveguide for millimeter-wave band is proposed. The transition covers the complete available bandwidth provided by ridge gap waveguide. The transition is used for feeding and measurement of a bandpass filter. Measured results are in good agreement with the simulation.

High rejection stacked bandpass filter optimized by group delay response

A new configuration has been used for design of a wideband resonator-coupled bandpass filter with high rejection on both sides of the passband. Corrected group delay in combination with space mapping was used to calculate the initial dimensions, which provides a response that is sufficiently close to ideal response in order to be used in full-wave optimization. The design was fabricated and measurements are in excellent agreement with simulation.

An Integrated Ka-Band Diplexer-Antenna Array Module Based on Gap Waveguide Technology With Simple Mechanical Assembly and No Electrical Contact Requirements

This paper presents the integration of a diplexer with a corporate feed network of a high gain slot array antenna at the Ka-band. A hybrid diplexer-splitter with a novel architecture is proposed to have compatibility for its direct integration with the feed network of the array antenna. A seventh-order hybrid diplexer-splitter is successfully integrated into a corporate feed network of a

Use of Group Delay of Sub-Circuits in Optimization of Wideband Large-Scale Bandpass Filters and Diplexers

16\times 16