Jian-Kang Xiao

Novel Microstrip Right-Angled Triangular Patch Resonator Bandpass Filter

Dual-mode and multi mode techniques have very important applications for microwave filter design to implement miniaturization and nicer performances of transmission zeros, wide band and so on. This paper presents a new multi mode bandpass filter with wide passband and two kinds of new DC-block dual-mode bandpass filters by using an isosceles right-angled triangular resonator which with much less attention, all have transmission zeros and low passband insertion losses. The new filters have novel, compact and simple structures as well as nicer performances, and are quite useful for modern RF/microwave circuits and systems.

A new PBG suspended patch antenna

A new suspended patch antenna with PBG structure is presented, and antenna performances are optimized, simulated and analyzed. Compared with a common patch antenna and a suspended patch antenna, the new PBG one is shown with the radiation pattern convergent and the front radiation enhanced, and the surface wave suppression and antenna performance improvement by PBG are demonstrated. The new PBG antenna possesses a relative bandwidth of 4.92%, which increased 3.89% and 1.46% compared with a common patch antenna and a suspended one, respectively. Simultaneously, obtains a E-plane gain and a H-plane gain of 11.42dB and 10.96dB, respectively, and both increased more than 2dB compared with the common patch antenna and the suspended patch antenna.

Wideband microstrip bandpass filter using single patch resonator

Fractal-shaped microwave passive circuits attract much attention recently, but dominantly applied in antennas. In this report, new fractal bandpass filters using equilateral triangular patch resonator are presented to implement high performances of multi-transmission zeros, wide passband and stopband, and low passband insertion loss as well as miniaturization. Using fractal defection in patch, multi higher order modes are driven for coupling a much wider passband, and parasitical harmonics are effectively suppressed as well. Compared with some literatures, sizes of the new filters reduced and performances are greatly enhanced. The proposed filters have compact and simple structures, small sizes, high selectivity and so on, and all these features are the requirement of wireless communication systems.

Microstrip Mismatching Technique for Reducing SSN in High Speed Integrated Circuit

In CMOS circuits, where consumption is not steady, current peaks produce voltage drops through the inductance, which manifest themselves as fluctuations in the internal supply voltages. This kind of noise is known as delta-I noise, simultaneous switching noise (SSN) or ground bounce. This paper describes a novel method to reduce the SSN: on-chip microstrip mismatching technique in the power supply wire. The microstrip is connected with the bonding wire. The microstrip is embedded in Si dielectric upon Si substrate and does not increase the size of the chip. Not only the impedance mismatching technique between the bonding wire and the microstrip is considered in order to get source reflection coefficient |Gammag | = 1 at the end source, but also the microstrip length is properly designed to get source reflection coefficient Gammagout = -1 at the end microstrip and make the input impedance of the microstrip looking out from the CMOS unit at nodes p and n close to zero, thereby shortening out the noise voltage. Si has high dielectric constant and can also greatly attenuate the noise because of high dielectric loss. The results of S 21 depicts that the transmission coefficient is around -40 dB and the noisy power produced by the bonding wire can not be delivered. The technique developed in this paper has the advantage of simplicity, easy realization, non-oscillation and there is no size, weight, and power dissipation penalties.

New microstrip low pass filter with transmission zero and wide stopband

New microstrip low pass filters with low insertion loss, ultra-wide stopband and transmission zero are presented by using triangular and trapezoidal patch resonators with fractal defection. With such defection and a certain parallel feed method, undesired responses and harmonics are effectively suppressed and wide band, sharp attenuation obtained. The new filters have simpler and more compact configurations even better filter properties than the traditional line based ones.

Microstrip multi-mode bandpass filter using right-angled triangular resonator

Multi-mode technique has very important application in microwave filter design for implementing miniaturization, wide band and nicer performances. This report presents a new multi-mode bandpass filter with wide passband by using single isosceles right-angled triangular resonator which with much less attention, and transmission zeros and low passband insertion losses are obtained. The new filter has a novel, compact and simple structure as well as nicer performances, and can be quite useful in modern RF/microwave circuits and systems.

New wideband microwave bandpass filter using single triangular patch resonator with low permittivity substrate

Fractal-shaped microwave passive circuits attract much attention recently. In this report, new planar bandpass filters with fractal patch defection by using equilateral triangular resonator and low permittivity substrate are presented to implement high performances of wide passband, transmission zeros, and low passband insertion losses. Using fractal defection acts as perturbation, single mode wideband bandpass filters are implemented, and filter performances are enhanced. Compared some reported dual-mode or multi-mode filters with the proposed ones, it shows the new filters have nicer performances even though operate at a single mode, simultaneously, posses compact and simple structures as well as miniaturization for having single patch resonator without coupling gaps. The advanced features of the proposed filters can be quite useful in wireless communication systems.

Novel on chip power distribution technique based on plant vein

In this paper, novel fractal on chip power distribution technique has been developed. The novel structure is designed based on leaf vein. The simulated and measured results illustrate that our physical structure has greatly improved resistive and inductive voltage drop, and noise isolation between the analog and digital circuits.

Band tunable microstrip bandpass filter using defected single patch resonator

Triangular patch resonator bandpass filters with tunable operation are developed to perform nicer filter properties of low passband insertion loss, transmission zeros and wide stopband. With tunable fractal-shaped defection acts as perturbation, filter operation frequency and operation band can be controlled, and the responses of undesired resonant modes are greatly weakened even suppressed. The new design brings filter more function which does not require changing the dielectric substrate or patch size. The designed filters have outstanding advantages of single patch with compact size and without resonator coupling gaps, simple circuit topology, nicer performances, miniaturization and can be easily tuned for more applications. All these features are well popular for wireless communication systems.

A novel power plane structure for EMC design for modern system in package

The design of power distribution network to deliver noise free power to high performance systems of increasing package density, high clock speed, high power demand at low voltages, and large current change with fast slew-rate is a challenging task. This paper describes a novel power-ground plane design with low power supply noise, low radiation for modern system in package. We design this novel structure according to a kind of plant leaf nutrient delivering system because we think it works in the best way in nature. We wish deliver the direct current to each circuit element as the leaf delivers the nutrient with the least resistance. The designed power-ground plane structure consists of a power plane with perforation (top), and a ground plane (bottom). The size of the perforation is far below the wavelength in order that the existence of the perforated opening on the power planes contributes less to the radiation of the whole structure. There is good agreement between the numerical prediction method and measurement results. The measured S21 is below -10 dB and SSN (simultaneous switching noise) cannot deliver into chip power system. The solders increase the DC resistance 2.7% for the novel structure power plane-ground plane and 18.68% for traditional structure. The Swiss-Chess structure effect (high resistance metal areas because of distributed via and solders and leading to the voltages or currents to the circuit-elements lower than design demand) is reduced. The simulated gain shows there is no antenna effect for our designed power-ground plane.