No abstract

A low‐cost, reduced‐size, single‐feed, single‐layer microstrip patch antenna is presented that receives right‐hand circularly polarised satellite signals for the global positioning system's L1‐Band (1575.42 MHz) and left‐hand circularly polarised satellite signals and vertically linearly polarised terrestrial signals for the satellite digital audio radio system band (2320–2345 MHz). The proposed antenna is constructed of a main central patch and a ring surrounding it, both with truncated corners to achieve the desired circular polarisation characteristics. The two patches are connected to each other using four long and thin microstrip transmission lines. The design, simulation and measured results are presented. The effects of varying key antenna physical parameters were carefully examined and discussed in detail to characterise their effects on operational bandwidth.

No abstract

No abstract

The placement of global positioning system (GPS) patch antennas on vehicles is important as its location directly affects navigation system performance. GPS antennas mounted on the front glass window has been adopted by several vehicle manufacturers around the world. In this work, we present a detailed experimental study on the effect of antenna mounting parameters as well as shorting it to the roof of the vehicle on its performance characteristics. Specifically, we investigate the effect of the glass tilt angle, the distance of the antenna from the rooftop of the vehicle in addition to grounding it to the rooftop versus not‐grounding to the rooftop of a vehicular platform.

The global positioning system (GPS) has become a standard navigation tool in modern vehicular platforms. The location of the GPS antenna has a direct impact on the overall navigation system performance. In this work, we investigate the effect of shorting the GPS antenna placed on the front windshield of a vehicle to its rooftop GND plane. It is shown that such a connection will improve the gain of the antenna by several dBs.

No abstract

The design and fabrication of a wide-band programmable radio frequency (RF) feed network is proposed. It is designed to cover a wide band from 2.5 to 6 GHz over two separate branches. The feed network is simulated and fabricated on an FR-4 substrate with 0.8 mm thickness. Good matching between simulation and measurement results is achieved. The measured amplitude resolution was 0.5 dB with a maximum error of 0.22 dB. The measured phase resolution was approximately 5.6° with 1° maximum error. This design is a generic one that can be used in any kind of RF or antenna systems.