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Transmitting and/or receiving arrangement for portable appliances
| Details |
Inventors: Rasinger, Josef; Scholtz, Arpad-Luwdig; Bonek, Ernst;
Assignee: Siemens Aktiengesellschaft (Munich, DE)
Primary Examiner: Hajec; Donald
Assistant Examiner: Le; Hoanganh
Attorney, Agent or Firm: Hill, Steadman & Simpson
An antenna for transmitter and receiver of a portable radio appliance (cordless telephone, mobile telephone, pager, telepoint appliance and so forth) essentially consists of two sheet-metal angles (2,3) which are arranged adjacently to one another. One of the two elements is excited with radio-frequency currents by means of a coaxial feedline (4). The second sheet-metal angle (3) is excited by parasitic coupling from the first sheet-metal angle (2). The sheet-metal angles (2,3) are identically oriented and the distance between them is much shorter in the end area than at the bending edge of the apex line. This results in high reactive currents and low impedance. The antenna can also be modified by feeding both sheet-metal angles (2,3), dividing it into two identical part-antennas or several sheet-metal angles. The sheet-metal angles can consist of metal foils which are applied to a plastic housing. In addition, an embodiment with wire angles is also possible. |
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DETAILED DESCRIPTION The invention is based on the object of improving the transmitting and receiving power of the antenna whilst ensuring that it is simple to produce and easily matched and has a wide bandwidth.
The object of the present invention is achieved by a transmitting and/or receiving arrangement for portable appliances, consisting of a shielding housing of metal, containing the radio-frequency section, and an antenna, the antenna consisting of two or more antenna resonators which are parasitically coupled to one another and are essentially identically oriented in the longitudinal direction, having in each case one free resonator end and in each case one end angled via a bending edge and conductively connected to the shielding housing, the transmitter output and receiver input, respectively, being connected only to the feedpoint of a single antenna resonator, if necessary via a duplex filter, via a feedline through a coaxial feedthrough in the shielding housing, which feedpoint is located between the bending edge and the free resonator end of this single antenna resonator, and the clearance of the slot formed between two adjacent antenna resonators being much less in the area of the free resonator end than at the bending edge for varying the input impedance of the antenna.
The resonators of the antenna which are not fed are parasitically excited by the fed resonator as a result of which the bandwidth of the antenna is increased.
Due to the angled shape and the widening of the ends, currents flow in all three spatial directions.
High reactive currents form which require low impedance.
This fills gaps in the directional pattern of the antenna.
Due to the low requirement for space, the arrangement is very well suited for mobile radio applications.
It can be easily manufactured and the entire radio-frequency, audio-frequency and digital electronics of a portable radio appliance can be accommodated in the shielding housing.
At the same time, the metal housing is used as the equivalent ground for the antenna
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