A novel, circularly polarized (CP) microstrip antenna array is described, in which the radiating patches are fed via a slot in the ground plane. Design and simulation data are provided for a prototype antenna working at 5 GHz. The antenna provides a high quality CP wave, and the structure is partially suitable for incorporating in multilayer microwave circuits.

A novel traveling-wave feed technique for circularly polarized planar antennas

Many current communication and sensor systems require high-density packing for transceivers. In particular, many such systems require the antenna to be closely integrated with the other transceiver circuitry. In this paper, we propose a new technique, which is capable of yielding high quality circular polarization, with a feeding system that is particularly suitable for incorporating in multi-layer microwave circuits. This type of circuit can be fabricated either in thick-film or LTCC, which are attractive because they can provide a combination of high-performance and low-cost fabrication. The proposed traveling-wave feed system offers a number of advantages over the rear-fed patch techniques. It does not require a probe through the dielectric layer beneath the patch. The current work is an extension of the concept of using a circular slotline channel beneath the dielectric layer to excite four rectangular patch antennas to provide circular polarization. In order to establish the validity of the proposed technique, a prototype 5 GHz antenna with a progressive incremental offset of 500 /spl mu/m was designed and tested.

A novel traveling-wave feed technique for circularly polarized planar microstrip antennas

In this paper, we propose a new technique, which is capable of yielding high quality circular polarization, with a feeding system that is particularly suitable for incorporating in multilayer microwave circuits. This type of circuit can be fabricated either in thick-film or LTCC, which are attractive because they can provide a combination of high-performance and low-cost fabrication.

Design and measurement data for a microwave CP antenna using a new travelling-wave feed concept

Design and measurement data are presented that show how the novel concept of a traveling-wave-fed circular-polarization (CP) microstrip antenna can be extended to provide an antenna with dual CP. A new refinement to the basic antenna structure is also introduced that shows that the efficiency of radiation can be enhanced by using a dual dielectric to improve the fringing fields at the edges of the radiating patches by around 40%. Furthermore, new theoretical and simulated data are introduced to support the original traveling-wave feed concept

Design and measurement data for a microwave dual-CP antenna using a new traveling-wave feed concept

A novel circular polarized antenna structure capable of high radiation efficiency, and suitable for use in multilayer microwave circuits is presented. The antenna uses dual ring feed system to enhance radiation. Data is provided for a prototype antenna working at 10 GHz.

A Novel Dual-Ring Multi-Layer Circular Polarized Antenna

A microstrip patch antenna employing a novel feed arrangement is presented. By using the slotline to microstrip coupling, energy is coupled to the radiating patches via a continuous slotline in the microstrip ground plane. This allows the patches and the feeding slotlines to be fabricated on a single substrate minimising device areas in MMICs. Using Hewlett Packard's high frequency structure simulator (HFSS) the electric and magnetic field distribution on a single patch design have been analysed. The results of measurements performed in an anechoic chamber are presented which show the radiation characteristics of a 10 GHz prototype antenna using the new feed mechanism. >

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Papers

A novel slotline-fed microstrip patch antenna